Chevy 350 Runs Rough Under Load


Installed engine in my 57 chevy truck, starts and engine runs great put can not get the timing mark to appear to set correct timing. I was told by several people it was either a cracked flexplate or or bad torque converter. I have a 1996 GMC K1500 5. The EGR system meters a little exhaust gas into the intake which lowers the combustion temperature which lessens the amount of NOx in the exhaust. When I drive the truck the engine light will go on and off. This vehicle is plateable, and runs and drives just great. I checked firing order (on the cap to the wires) its in the correct order. I am trying to tune out a hesitation in the off idle part throttle range. They are part of a relatively small group of upgrade products that can bring both high-level aesthetic appeal and also real practical use to your car. The truck has a 350 crate engine coupled with a Rochester Quadra-Jet 4bbl carb. 7, Everything is stock, have never had a problem. I pulled my engine sbc 350. Mike B, Nov 3, 2018. Q: When I use my car it idles at 700 and then stalls when used for 5 min but there are no check engine lights. Morris 4x4 Center offers lift kits from top brands in stock like Teraflex, Rough Country, Old Man Emu, and Rubicon Express. It feels like an old carb with a bad accelerator pump, give it a little gas and it falls on. Connect the vacuum gauge hose as close to the intake manifold as possible and start engine. How to Adjust a Carburetor. I'm betting you'll pick up a 1/4 minimum changing only the heads. Reader Question. The engine misfires or runs rough when it is fully warmed up at constant speed or stopped and really bad when pulling a load up a hill or when power breaking. No worries. 55-66 stepside bed. Consumer writes in regards to diesel engine failure - service bulletin refers to vehicle misfire/ runs rough due to a broken injector hold down clamp. 9-liter six-cylinder Cummins diesel under the hood puts out 460 lb. Before narrowing it down. Car starts on a dime and drives great for about 10 mins just all of a sudden just bogs down and idles really low then finally stalls. Finally figured. i got it running, changed points & cond adjusted the quadrajet, timed it by ear to start warm with 1/2 crank but it sounds like its missing a few cyls. by Kyle McFadden. of the time it's. I had 1 gal. Once the brake is released the car runs good, it doesn't have much power and I have to take off slow or it will load up and run bad. I have spent countless hours going over the engine looking for vacuum leaks and believe every thing is OK on that front. My car has an automatic transmission. If I'm in park and mash the pedal the engine will hesitate a little but will rev up. I got the engine timed to the 6 before TDC GM spec. We tried a known good quadrajet off another car that was running fine and it still did the same. The Ram Heavy Duty is excellent for towing and is the perfect. Average failure mileage is 63,000 miles. Easy to use parts catalog. Stalling out and wont stay running. Unplug mass air flow sensor restart truck and drive to see if helped. ( I figure the tank was under vacuum but I am not sure). A year worth of head scratching. dropped in teens one morning it wouldn't start. Hurdt299, Jul 30, 2011. The computer reads that all of the electronic components of the pump are running at optimal, but a pressure guage connected to the feul rail on the intake showed the pressure was 58psi at an idle and it dropped to [email protected] 2000 rpms. The PCM will then use default settings for the ICP and the rough running should go away. Myth 6: There is a specific #1 terminal on the distributor cap. Feels like electrical to me, but who knows. it used to run just fine, but slowly over the course of a couple months it ran richer and richer. Lynch Chevrolet of Mukwonago Inventory. narrowed it down to the in-tank feul pump. Replaced: 1) Replaced the coolant temperature sensor 2) Replaced MAP sensor 3) Checked the throttle sensor response is as required 4) Checked the O2 sensor via propane torch test, checked fine 5) Replaced the Fuel Filter 6) Checked the. 7L Chevrolet truck. All bead blasted and in primer to protect the metal. of torque, which can easily pull up to 12,000 pounds. Re: Hesitation an backfire under acceleration Nov 03 2015, 11:19pm Thinking it maybe clogged cat or cats, but I checked my fuel pressure today and with key on and engine off it read 50 Psi, then running it drops down to about 47psi,hopefully it's not the pump or bad check valve on the pump,hopefully clogged filter being that I replaced the pump. 7 ~ 276K Miles. The next day I added a bottle of Lucas fuel treatment to a fresh tank of gas. The engine has a little over 500 miles on it. 5 will never run hot again. Swap the rocker arms from the 1. Once the brake is released the car runs good, it doesn't have much power and I have to take off slow or it will load up and run bad. started it up and idled it up to around 2500 to blow it out. com and find specs, pricing, MPG, safety data, photos, videos, reviews and local inventory. Idles perfect, starts right up. 3 L) "Turbo-Fire" V8 was the first Chevrolet small-block, although the first Chevrolet V8 was produced from 1917 to 1918. O rings used to seal oil plugs in the high pressure oil rail/system commonly fail on the 6. I’ve checked the timing and it’s set at +2 degrees. i with a 600 holley. hey guys, i recently aquired a 91 chevy C2500 with a new rebuilt 350 tbi. Follow along as we test fit a Big Block with a Turbo 400 transmission combo in our 1966 Chevy El Camino project car, only at Chevy High Performance Magazine. Conrad -JSW said: If you shut your car off during the regen cycle the cycle is aborted. Before I used the boat last week the cranking battery was dead. The usual cause of engine ping is over advanced. A week or 2 ago the truck started missing and surging anywhere but idle or wot. Engine starts OK, increases RPM then gets too slow with lots of black smoke. Having a a major dilema with a rough idle / Multiple Cylinder Misfire on my 2001 Chevy S10. It ran 1 hour and 5 minutes,so I always figure 1 gal per hour. 6-liter powerhead that delivers exhilarating acceleration and top speed. When the engine misfires, you may have trouble getting your boat up to speed. Run the engine at a high idle for about 10 seconds. 01-02-11 12:41 PM - Post# 2025792 In response to strictlygm To run well without EGR you need a custom chip/tune. This will allow for more air and fuel, create more power, and lower the manifold vacuum reading. Once the brake is released the car runs good, it doesn't have much power and I have to take off slow or it will load up and run bad. I have a 1996 Chevy Silverado 5. 163,000miles and still looks fairly new. 7L (350CI) Throttle Body Injected automatic with 126,000 miles. When I drive the truck the engine light will go on and off. 1995 Chevy K1500 203K mi. This happens ofter when pulling up a rolling. O rings used to seal oil plugs in the high pressure oil rail/system commonly fail on the 6. Diagnose rough running chevy R10. 20 minutes under a simulated load at around 3k rpm to promote initial ring seating. Had intermittent stumbling and backfiring thru exhaust when under load. Dad out ranked me (car owner and crew chief ) so he got to work topside. While there are a variety of reasons your Chevrolet Silverado 1500 has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. Under normal accelerating, the car seems fine. Run engine until normal operating temperature has been reached and then allow to idle. 2019 GMC Sierra 1500 For Sale. Value – cost less to own than minivans. Finding the correct air and fuel mixture will help extend the life of your engine. It was a 3/4-ton passenger van with the Beauville trim package, equipped with two-tone paint, seating for eight, 350-cubic-inch small-block Chevrolet V8 engine, Quadrajet carburetor, automatic. 1 compression. '87 Chevrolet TBI 350 runs rough under load. i have a 76 gmc high sierra 4wd has 350 with holley 600cfm carb. Conrad -JSW said: If you shut your car off during the regen cycle the cycle is aborted. "The dirt wasn't the only place we drove the Trail Boss. My truck won't start in cold weather unless I use starting fluid. I am having a terrible time with getting it to idle smooth. 05-19-10 02:12 PM - Post# 1917465 In response to mid tenn mike I will be VERY surprised if this ends up solving your problems. Used 2000 Chevrolet Values Select a 2000 Chevrolet model below to get used trade-in values and retail prices Under $15,000 $15,000 - $25,000 $25,000 - $35,000. Some motors will idle too fast/rough at manifold vacuum, in which case you will need to connect your vacuum advance to ported vacuum. Discussion in 'The Hokey Ass Message Board' started by HeavyChevyDeluxe, Mar 15, 350 9. The MAP sensor senses intake vacuum, which the PCM uses to estimate load so it can adjust the air/fuel mixture accordingly. Almost certainly. Find 343 used Chevrolet Nova as low as $28,995 on Carsforsale. There are many factors which affect horsepower. I have a 2001 chevy silverado (110,000) that was making a bolt in spinning drum type of sound from the bellhousing area. It run good but when you take of it seems like it lose power. "Low voltage will make it seem like the motor is running rich. Stalling out under load. My problem is it has a rough idle and it is hard to start. When autoplay is. and when i keep my foot in the pedal it doesnt clear up engine is mild 350 with h. I just bought a 1994 K2500 w/ 5. I read it and it was a P0300 Random/Multiple Misfire. Can figure out whats going on. 3, 130,000 miles. at idle w/ no load the engine runs almost perfectly(has slight misfire). Would crank normally but not start. If your O2 sensor is more than 50-70,000 miles old, replace it. was running just fine, but now will not idle at 800 RPM. the truck runs good when in park or nuetral but within seconds of putting into reverse or drive she bogs dwn and dies. GMC Sierra 1500 Experts. 5 ratio to 1. That was perhaps his best advice. The older style ignition switch on the 1995 through 1999 trucks exhibits a different list of symptoms associated with the failed part. "Low voltage will make it seem like the motor is running rich. ran about 1/4 tank through with injector cleaner. It was also cited as the Best Pickup Truck by Car and Driver magazine for three consecutive years—in 2001, 2002, and 2003. I have a 1961 292 in my '54 Mercury. American Auto Wire. The 2009 was part of the sixth generation (C6) Corvette lineup and the ZR1 was the top dog. The Binder Plant Injection stickies have a link to an in-tank install that happens to show an FSJ installation! SES (Service Engine Soon light) aka Idiot Light. Have to coast over into the break. Chevy silverado 5. 7) with TBI. Reader Question. changed both injectors, seals and gaskets changed the TPS, IAC, MAP, and ECM engine runs now but doesnt stay running, idles rough. The 2005 Ford Escape has 6 problems reported for rough idle and hesitation on acceleration. It ran 1 hour and 5 minutes,so I always figure 1 gal per hour. This may be a sign of a failing idle air control valve. Silverado & Fullsize Pick-ups - 95 GMC misses/runs rough after warmup - Hey people I have a 95 GMC c1500 pickup w/5. Well, I have been having the same problems that many of us on here are having with an iradic idle, hesitation under load, and sputtering up to like 3000 rpm. Rochester carburetors were quite possibly the most widely used carburetor in the twentieth century, with over one million units produced by the Delco Carburetor Company, a division of General Motors. That cam is nearly identical to Eddy's Performer cam, so it's a match to the heads. All bead blasted and in primer to protect the metal. I own a 2004 silverado Z71 4. Even better, my power response on those hills is improved noticeably over how it was running before. 0L Power Stroke. The Chevrolet Silverado received a truck load of recognitions and awards over the years. From cities and jobsites to dusty ranches and winding highways, your Chevy Silverado owns the road. Dan Ferrell writes about do-it-yourself car maintenance and repair. The Chevrolet small-block engine is a series of V8 automobile engines used in normal production by the Chevrolet division of General Motors between 1954 and 2003, using the same basic engine block. I have a 1997 chevy 1500 siverado with a 5. Finally bought a code reader and found bank 2 sensor 2 oxygen sensor bad and a cyl 5 misfire code. blakestree: The procedure that you are referring to is (IMHO) achieve the initial hydraulic lifter preload so that you can get the motor running then do the final preload adjustment with the engine running. This is where thousands of automotive technicians from all over the world exchange information and ideas, 24 hours a day. You'll be able to troubleshoot and diagnose a bad ignition coil, or bad spark plug wires, or a bad ignition control module as the cause of a misfire condition on your 3. either email me at [email protected] Acts like it wants to run but gets choked out. mammoth loads you’re hauling under control. I never noticed the rough idle before, and it certainly did not "stutter" while driving before. patricksullivan. It runs up fine is you don't hammer it from Idle. It is definitely worse under load. 5-05 LLY Forum. 7L TBI - Rough Idle/Stalling by AKupNorth Apr 10, 2018 12:56PM PDT (Let me try again. Compression test, all within 10 pounds, 160-170 psi. He has certifications in automation and control technology. Shop millions of cars from over 21,000 dealers and find the perfect car. Runs just as rough at idle or higher RPMs. Idle is fine but when I [rapidly increase the throttle the motor] has no power and dies down. Its a V6 4. I pulled my engine sbc 350. '87 Chevrolet TBI 350 runs rough under load. Chevy / GMC Duramax 01-04. The Certified Service technicians at your Chevrolet, Buick, GMC, and Cadillac dealers are expert finders and expert fixers. Symptoms----cold drive-ability, bucks @ part throttle, worse under load, backfires, belches black smoke(you should see my tailgate ) Timeline and service related incidents--- Little over a year ago, it quit a couple times---I mean locked down like the key was switched off. if i stop for a snack get back in my truck and start it same problem for 3-5 min. Engine is a big block Chevy 454. 7L Chevrolet truck. Thank Chevy Trucks' 75-year tradition of working hard, looking great and lasting the longest for this domination. I rebuilt the carb (not the problem) Replaced fuel filter which was not plugged. I just bought a 79 Chevy C20 with a 350. It was tuned up 2 months ago changed fuel filter and when we took it out a lot of air came out instead of gas. Recently rebuilt the 454 in my 1990 TBI Burb. Correct tire inflation pressure allows drivers to experience tire comfort, durability and performance designed to match the needs of their vehicles. Posted By: jy on 03/29/11 01:29pm I have a 99 Coachman with an Onan 6. The most common cause for this problem is a weak fuel pump which cannot supply the volume of fuel needed for the injectors to produce a proper spray pattern or deliver the amount of fuel needed for engine acceleration. Sometime dirty parts can also be the root cause of a rough idling engine. Our technicians tell us that the distributor should be overhauled or replaced to correct this concern. 2010 Ford Escape 2. If you have installed a Fuel Injection system in your vehicle and are having some initial issues here is a quick checklist to work from to get you started. Rochester carburetors were quite possibly the most widely used carburetor in the twentieth century, with over one million units produced by the Delco Carburetor Company, a division of General Motors. Starter drive gear sounds more like a "Ting, Ting". From 1974 to 1985 there was an integrated head produced for the 250 that offered a 1. Truck idles fine but once put into gear and a load is put on the engine, it begins to sputter, choke out, and eventually stall. I have a 1961 292 in my '54 Mercury. Most auto repairs shops charge between $75 and $150 per hour. 7 350 engine 183,000 miles. Install a HEI distributor and my truck idles great but when I get on the street it runs bad. Rough idling can also be caused by clogged filters. If you shut your car off during the regen cycle the cycle is aborted. Will a bad oil pressure switch/unit cause no power to the fuel pump and high idle in a 91 chevy Scottsdale c2500 5. Vacuum advance seems to be working. [Archive] installed edelbrock 1406, dies under load General FSJ Tech Sorry guys, been a rough week, got laid off my second job. Installed engine in my 57 chevy truck, starts and engine runs great put can not get the timing mark to appear to set correct timing. Off idle and during acceleration it runs fine. Hope that's okay, not an option if I want to keep my teeth in place. 2019 Ford F-350 Super Duty Panoramic moonroof. Any 12V light will work. I hooked up a fuel pressure gauge and here are the readings. car starts and runs fine until engine heats up to operating tempature, then it stalls, it will restart but keeps stalling until engine cools down. Feels like electrical to me, but who knows. 2020 GMC Sierra 1500 For Sale. ran about 1/4 tank through with injector cleaner. My 1990 Chevy Silverado 5. My biggest curiosity was fuel use and whether the Predator would live up to the claims on the box: 11 hours at 25% load (750 watts), and 90 hours at 50% load (1500 watts). Needless to say, I pulled the transmission, flexplate was fine, so I replaced the entire transmission with one of half the miles. Resurrecting an old thread here. If I floor it in idle it falls on its face around 3800 to 4000 rpm it falls and spudders. the RPM is Okey when i “start” the car, however when i push the gas to start driving, the RPM goes up to 4k and 5k and the car does not run or runs supper slow (an RPM of 5k with a speed of 5MPH). The Chevrolet Silverado received a truck load of recognitions and awards over the years. Vacuum advance seems to be working. Connect the vacuum gauge hose as close to the intake manifold as possible and start engine. Fuel trims at idle and at cruise were in a fairly normal operating range of -5 to +9. Make: Chevrolet. at idle the voltage goes from 12 to 14 just bouncing around , i tryed the the MAF sensor cleaning and it helped somewhat i have already. My truck (1990 Chevrolet 1500) now sits for extended periods of time. Took my dad's truck for a spin and it sure seems to have some loss of acceleration and it's only around 130,000 km. You might give that a try before taking it to a mechanic. was running just fine, but now will not idle at 800 RPM. 60 valves, Edelbrock. Recently, it started sputtering and choking,then stalling after running for several hour and stopping for gas. Had recently filled up and thought it might be bad gas. Find Chevrolets in the list below, including Chevy Vega, Cosworth Vega, Monte Carlo, Monte Carlo SS, Blazer K5, Camaro, Camaro Z28, Camaro IROC-Z, Camaro SS, Camaro Berlinetta, Camaro B4C Police Car, Corvette, Corvette Stingray, Corvette Indy Pace Car, L82, Corvette Callaway, Corvette ZR1, Corvette Grand. A misfire under load complaint can usually be broken down into 2 categories. Checked for vaccuum leaks, reset base idle, tested sensor components, ran Win aldl diagnostics, could not get it to run right. It would start back up and run fine. (201 people reported this problem) RepairPal Fair Price Estimate. The Corvette hit rock bottom in 1978 when Chevy installed a 350-cubic-inch V-8 engine that only squeezed out 185 horsepower as its base engine. A while back I had bad misfiring (sputter, missing, and stumble) while accelerating and in the last gear under greater load i. Sometime dirty parts can also be the root cause of a rough idling engine. Without the proper mix of fuel being supplied to the engine, the air/fuel ratio becomes lean which can cause a loss of power and slower acceleration. I tested this by measuring out 250 ml of fuel, running under a constant load until the generator died. com or post back. 2003 Ford F-150 50,000 mi, At Idle my F-150 5. Centric Axle Packs are. Diesel Smoke tells YOU a Story. Any 12V light will work. "Low voltage will make it seem like the motor is running rich. You might give that a try before taking it to a mechanic. If you have access to a diagnostics scanner that reads live data, watch the o2 upstream data as well as the downstream o2 data. A while back I had bad misfiring (sputter, missing, and stumble) while accelerating and in the last gear under greater load i. Engine started fine, revs fine in neutral but once over 3000 revs in gear loses power under load. My problem is it has a rough idle and it is hard to start. The obd2 code showed a misfire in the #4 cylinder (P0304). Can someone please help with what I should check next, I have a 1998 Chevy K1500 5. The truck starts, idles, and revs normally and when accellarating slowly everything works just fine, but once you get past half throttle it falls on its face and acts like it has a clogged fuel filter or bad fuel pump. How to Adjust a Carburetor. Easy to use parts catalog. Whether you're looking to maintain, optimize, or upgrade, we offer competitive pricing on Dee-Zee Rough Step Running Boards (Black) - DZ15321S for your Truck or Jeep at 4 Wheel Parts. With the engine running at idle, use the insulated plug wire pliers to remove one plug wire at a time at the spark plug location. Has a quadrajet carb, new fuel pump and filter, new points, condensor, new coil. In fact, it was Chevrolet's toughest truck made, and remains so to this day. Rochester carburetors were quite possibly the most widely used carburetor in the twentieth century, with over one million units produced by the Delco Carburetor Company, a division of General Motors. (201 people reported this problem) RepairPal Fair Price Estimate. It does run smoother now. It only takes a minor problem like a fouled spark plug to cause. Over a long period of time the higher combustion temperature can cause valve damage. There are two main contributors to the answer. Don't miss what's happening in your neighborhood. I've checked the timing and it's set at +2 degrees. The symptom was that the engine would starve of fuel under heavy load. Chevy SUV & Crossover Tech Forums. (That's what it sounds like but no flame). Referred to as the low speed circuit by Weber, this circuit is responsible for 80% of the driving operation. 75 inch bore of the 1955-1957 265 CID V8 which was the first small-block Chevrolet V8. 3 V8, Chevrolet, Cadillac, Buick, and GMC, 8 replies Lincoln Mark VIII hesitation, Ford and Lincoln, 8 replies Where can I find info on the 1988-1998 Chevy pickup truck V8 engines?, Automotive, 2 replies Fuel mileage Chevy pickup, Automotive, 4 replies. It is then run for approx. Changing the plugs did not solve the problem. I drove this SUV for a few miles with no issues. The Ford F-250/F-350 is part of the Ford F-Series Super Duty lineup of heavy-duty trucks. I am having a terrible time with getting it to idle smooth. There were. I have replaced the engine temp sensor, the connections to the coil, the. The 305’s bore was even smaller than the 3. 4l (454ci) motor and having the exact same problem the gentleman that started this thread did. It now starts and runs much better. When I first start it up it runs around the 900 mark and then slowly drops to the 500 mark in park. I have a 1997 chevy 1500 siverado with a 5. Less than 49K original miles. I have a 1995 chevy 2500 350 tbi a/t. Edelbrock 600cfm carb is 6 months old. (That's what it sounds like but no flame). An engine that hesitates, stumbles or misfires when accelerating or when it is under load, is an engine that is either sucking too much air, not getting enough fuel, or misfiring. com and find specs, pricing, MPG, safety data, photos, videos, reviews and local inventory. Mobility 1500 Series Conversions $ 29,495 starting at Learn more Traverse. Initial timing is 10-12 Deg Full(total) timing is 22 deg I don't think the Vacum adv is working (New vac mod) Idle is set at about 600-650 RPM ( Guessing!! no tach) Any thought Oh yeh it will fire through the carb. over the past few weeks i have gone on little test drives, turning the timing up a little as seems ness. Silverado HD is ready for adventure. Checked compression and 110 on all cyls. Read more Ford reviews to learn about other models. Actually, this is the world's longest continuous use vehicle in production, starting from 1933 till present days. All bead blasted and in primer to protect the metal. Resurrecting an old thread here. For a road car, you want vacuum advance. GMC Sierra 1500 Experts. Code P1345 dertermines if the distributor is installed incorrectly, or if a mechanical malfunction is present in the engine. Runs just as rough at idle or higher RPMs. Tin sort of a sound. Here are some: Stalls at idle, stalls when I put the clutch in, stalls when I turn a corner, misfires, surges, no power, cuts out, no power at top revs, runs rough, etc. 6:1 Edelbrocker performer RPM air gap intake 2in carb spacer Idling in neutral it sounded ok but under any load it popped out of the exhaust and backfired through the carb. patricksullivan. narrowed it down to the in-tank feul pump. Few days later it would start after it stalled then chug all the way home. Ride along with a family as they use. Hello everyone, Im new to the forum. 2016 Ford Transit Van. A week or 2 ago the truck started missing and surging anywhere but idle or wot. The system provides a structured way to receive help for free, in exchange for offering your own help in return. Rochester carburetors were quite possibly the most widely used carburetor in the twentieth century, with over one million units produced by the Delco Carburetor Company, a division of General Motors. 88 chevy 350 w/ tbi problems: Sign In it 'thinks' you are under load, and commands more fuel. Oxygen sensors measure how rich or lean the gasses are as they exit the combustion chamber. Pay attention to any jerks or stutters, particularly while accelerating under a load, as a symptom. I'm wondering if there's a problem somewhere like bad intake sensors or something. I used some dry gas, fule injection cleaner, sometimes it smooths out, but runs rough again. Fuel filter is new, 350 engine, throttle body injection will chug and miss under load when engine warms up but runs fine at idle. To get more accurate measurement of power rating, the engine should be placed under load using a dynamometer or dyno. When I removed the fuel cap, I had a huge amount of air pass to equalize the pressure. Retractable running boards. Changing the plugs did not solve the problem. I can get it to start but. 7 vortec with multiple misfires under load/accelerating. So far I've replaced all the plugs, plug wires, new fuel filter, and new coil pack and injector in the number 4 cylinder. After turning car off cooling fan stayed on several minutes, which it had never done before. I replaced the freeze out plugs with brass ones and replaced the head gaskets with marine ones. I can't even run 5lbs in the lines because it rides way to rough with the truck is empty so I'm running with no measurable air pressure on the empty pickup bed. 5-05 LLY Performance Parts Discussion. Brought the boat up river this afternoon and the port engine had no power, could not get it above 1800 RPM (350 Mercruiser)got to the dock and put it in netural, all kinds of power with no load. Since you've had a power problem, I'd start with ensuring that the power was good. I tested this by measuring out 250 ml of fuel, running under a constant load until the generator died. OK, I bought someone Else’s problem. Engine skipped occasionally and would pop-pop-pop under heavy acceleration. Next while the engine is still warm drain the oil and change the filter. "Low voltage will make it seem like the motor is running rich. Four barrell opens with loud noise just like it is supposed to, no knocks, clatter, sounds great with no load. USUAL CAUSE Engine ping is the result of abnormally high combustion temperatures. 4l (454ci) motor and having the exact same problem the gentleman that started this thread did. A low oil level can cause engine ticking noises as valvetrain components aren’t getting the proper lubrication and start to get noisy. I - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. (I don't drive her much still working on it). First post for me. Heavy duty water pump, dual thermostat, duramax fan upgrade, your 6. Brought the boat up river this afternoon and the port engine had no power, could not get it above 1800 RPM (350 Mercruiser)got to the dock and put it in netural, all kinds of power with no load. Asked in Chevy 350 Why would a 1975 Chevy 350 idle fine for a few minutes but when taken driving runs fine when accelerating but sounds like it is trying to die when the at low RPM's ? Sounds like. Once the brake is released the car runs good, it doesn't have much power and I have to take off slow or it will load up and run bad. Been fighting with the infamous "rough idle" situation on my 1996 F-150 w/ 5. then if it doesn't run under load, you have other problems. An engine tune up is necessary at manufacturers recommended intervals to maintain proper engine run-ability. Discuss 1990 TBI 5. Had intermittent stumbling and backfiring thru exhaust when under load. The 2020 Chevrolet Silverado has a solid lineup of powerful engines, including a V8 with best-in-class towing capacity and a turbodiesel that gives this Chevy best-in-class fuel economy. 78 chevy pickup. I am trying to tune out a hesitation in the off idle part throttle range. No real mods (K/N, Flowmaster exhaust). McGaughys also has some of the highest quality SUV lowering kits and McGaughys Drop Kits around! McGaughys now offerst SUV lowering kits & McGaughys Drop Kits for most of the popular SUVs and they are available in 2/2", 2/3", 3/5" and 4/5" drops! Making McGaughys lowering kits the #1 choice to drop your Chevy, GMC, Ford or Cadillac SUV!. of gas and added 4 oz. Finally bought a code reader and found bank 2 sensor 2 oxygen sensor bad and a cyl 5 misfire code. With our selection of quality brands and expert advice, we help boost your vehicle's performance and make a statement on or off the road. So if torque is what you're after, "there's no replacement for displacement". Not sure if boats are same, but should be within a couple deg. Whether you're looking to maintain, optimize, or upgrade, we offer competitive pricing on Dee-Zee Rough Step Running Boards (Black) - DZ15321S for your Truck or Jeep at 4 Wheel Parts. Chevy Suburban/Tahoe Rough Idle and Stalling. Advanced users would also find this manual very handy. If your engine starts operating in a manner that gives you the perception of “running rough”, it is likely due to a handful of common causes. All bead blasted and in primer to protect the metal. hey guys, i recently aquired a 91 chevy C2500 with a new rebuilt 350 tbi. Finally bought a code reader and found bank 2 sensor 2 oxygen sensor bad and a cyl 5 misfire code. I was told by several people it was either a cracked flexplate or or bad torque converter. Caution! The only time you can safely run an engine with an open throttle is when the engine is under a load. Also have headers and flat pistonsnothing real crazy. The light will trigger when the engine is running and the camshaft sensor reference pulse is not detected at a correct relative position with the crankshaft. Losing power under load - problem solved. 028 results in minor pinging, but no hesitation or surging. 2 problems here. So i have a chevy 350 i rebuilt recently and have put about 50 miles on it and it ran great. It runs very rough and seems to be backfiring through the carb. also what size holley is it, if unknown get the numbers off the air horn and post. Joined Aug 27, 2011. I'm sure it will work well under a load as well. First post for me. Most auto repairs shops charge between $75 and $150 per hour. , NC (2014 Chevrolet Silverado 1500 LT 4. Fuel filter is new, 350 engine, throttle body injection will chug and miss under load when engine warms up but runs fine at idle. The 2005 Ford Escape has 6 problems reported for rough idle and hesitation on acceleration. Compression on the new engine is at the high end 170 to 175. A shorted diode in the alternator can still allow a charging voltage of up to 13. Won't plane out, and wont go over 3,000 rpm. I pulled my engine sbc 350. Over a long period of time the higher combustion temperature can cause valve damage. Re: Chevy TBI 350 stumbles on acceleration « Reply #21 on: April 20, 2014, 06:50:41 PM » As long as the base timing is between TDC and 6° BTDC, and the engine doesn't ping, timing isn't likely an issue. Well I checked timing first, and the timing mark is way off. I have a 1961 292 in my '54 Mercury. If the truck runs rough when it’s cold but clears up when the engine is warm, you have a stiction issue in your injectors. It is then run for approx. 1983 chevy C-20 305 ci. During the reveal of the 2019 Chevrolet Silverado 1500 at the 2018 North American International Auto Show in Detroit, Chevy said the new truck would have six engine options. The fan runs a bit to cool off the system and it's perfectly normal. Backfires and pops, runs rough. Running rough under load mystery. Ignition Systems Cheat Sheet for the Chevy Small Block For our budget-oriented purposes we find that conceptually at least, GM’s HEI distributor is a near ideal choice in terms of practicality. My car has an automatic transmission. 1995 Chevy C10 1500 5. TBI definition. General Motors to Shutter Australia’s Beloved Holden by 2021. In fact, I’ve heard guys say they’ve locked out their advance and just run a fixed timing amount. ran about 1/4 tank through with injector cleaner. Innovative Mobility. Check valve clearance. I am stumped. Plus, thanks to our 1-Year, Lower Price Guarantee you can trick out your truck while saving some cash. really not looking fwd to having to tare the engine apart to get to the chain hoping the new 1995 chevy silverado 350 TBI V8. Dieseling or engine run-on is a condition that can occur in spark-plug-ignited, gasoline powered internal combustion engines, whereby the engine keeps running for a short period after being turned off, due to the engine kicking back upon shutdown, drawing fuel through the carburetor, into the engine and igniting it without a spark. This will allow for more air and fuel, create more power, and lower the manifold vacuum reading. Have not changed plug wires or coil in HEI, but plan to change wires this. dragonflyoffshore. 1993 Chevy c1500 pick up, 350ci V8, automatic. However, there is no reason you can't run a larger blower on a small engine, such as a 6-71 on a small block 327, as long as you adjust your drive pulleys to get the blower to run slow enough to keep the boost down to a level that is appropriate for the. 215,000 on the truck, 40 or so on a GM crate engine. Sometimes it runs ok it hasn't always done this just started not long ago. It does it sometimes at idle when cold and does it just going down the road at 40-45mph when it gets into overdrive and is running in the 1500RPM range. It can also be purchased at authorized vehicle and truck dealerships. I'm wondering if there's a problem somewhere like bad intake sensors or something. The Corvette hit rock bottom in 1978 when Chevy installed a 350-cubic-inch V-8 engine that only squeezed out 185 horsepower as its base engine. "Low voltage will make it seem like the motor is running rich. I just bought a 1994 K2500 w/ 5. The Chevrolet truck ignition switch problem is commonly found on two separate generations of Chevy pickup trucks and sport utility vehicles. was running just fine, but now will not idle at 800 RPM. 7L Vortec surges while accelerating and driving The truck will idle fine except for the occasional rough idle in gear during the times the truck is running badly. https://www. Swap the rocker arms from the 1. Asked in 1995-2005 Chevy Cavaliers. Yet under load, the engine could bog, backfire, and run like poo. 5 will never run hot again. The engine idles a little rough and the cel is on. Re: Chevy TBI 350 stumbles on acceleration « Reply #21 on: April 20, 2014, 06:50:41 PM » As long as the base timing is between TDC and 6° BTDC, and the engine doesn't ping, timing isn't likely an issue. really not looking fwd to having to tare the engine apart to get to the chain hoping the new 1995 chevy silverado 350 TBI V8. to the point where it was dieseling every time i turned it off. This happens ofter when pulling up a rolling. I have a rat rod 55 - 66 stepside bed. Symptoms----cold drive-ability, bucks @ part throttle, worse under load, backfires, belches black smoke(you should see my tailgate ) Timeline and service related incidents--- Little over a year ago, it quit a couple times---I mean locked down like the key was switched off. Its a V6 4. Fule filter will be next thing I will replace. It run good but when you take of it seems like it lose power. (That's what it sounds like but no flame). 3 V8, Chevrolet, Cadillac, Buick, and GMC, 8 replies Lincoln Mark VIII hesitation, Ford and Lincoln, 8 replies Where can I find info on the 1988-1998 Chevy pickup truck V8 engines?, Automotive, 2 replies Fuel mileage Chevy pickup, Automotive, 4 replies. 99 Suburban 2500 with a 454 bogs down bad while under load while giving it some throttle. Then when I went out for the third time it ran fine until I shut it down to float for a while. The main focus of the manual is on scope usage, interpreting waveforms, and utilizing your. No real mods (K/N, Flowmaster exhaust). Easy to use parts catalog. Dealer replaced valve cover, and intake manifold for $1100, out of warranty. There are many benefits to this service. The MAP sensor senses intake vacuum, which the PCM uses to estimate load so it can adjust the air/fuel mixture accordingly. Finally got my SBC 350 running again from over the winter, Now that i have it running i have some weird problems. 20 minutes under a simulated load at around 3k rpm to promote initial ring seating. iATN TechHelp is the heart of our network. 7L 350 is difficult to start (hot or cold), and runs rough at idle and under acceleration. The fan runs a bit to cool off the system and it's perfectly. Re: 72 chevy 350 running rough under load! A waste to try to explain your timing if you're off trying to find a reason to kill your eddy carb. The engine would not restart or idle. It should be regarded. It now starts and runs much better. I also noticed the tachometer bouncing on me a few times. Replaced the engine and it starts and runs fine, until you drive it under load. banging or knocking), it is easiest to first check for spark (ignition) and fuel. narrowed it down to the in-tank feul pump. But if I try and mash the pedal the car bogs down. The most common cause for this problem is a weak fuel pump which cannot supply the volume of fuel needed for the injectors to produce a proper spray pattern or deliver the amount of fuel needed for engine acceleration. Featuring an Eagle forged stroker crankshaft, SRP or Mahle forged pistons, and performance aluminum cylinder heads, this Chevy 427 ci crate engine, pumping out a whopping 550+ HP, is certain to leave most Ford owners in the dust. It is basically a 33x11. Vapor lock problems are reduced when using an electric pump because the fuel is pushed from the tank under pressure rather than being pulled under vacuum, a condition that produces vapor. With the engine running, valve cover off, loosen one rocker arm at a time until it clatters. when car is in park runs bitchen and rev it up no problems or stumbleing seems like only happens under a load. The 2020 Chevrolet Silverado has a solid lineup of powerful engines, including a V8 with best-in-class towing capacity and a turbodiesel that gives this Chevy best-in-class fuel economy. The Certified Service technicians at your Chevrolet, Buick, GMC, and Cadillac dealers are expert finders and expert fixers. This builds up fuel pressure quickly. Normally it idles around 950-1050 RPM, what has been happening is that it would start, idle high, around 1500, then drop to normal, and then start sputtering and RPMs would fluctuate anywhere between 750 on the. When cold, started up perfectly. The Corvette is such a staple of the Chevy lineup that it made our list of Chevy cars three times (two good, one bad). Dirty oxygen sensor. if i stop for a snack get back in my truck and start it same problem for 3-5 min. Our staff is ready to help you with your purchase. 7L Chevrolet truck. my 1978 Chevy C10 is my daily driver to high school and it has a Chevy 350 5. It screams; and it's the first time I have been impressed with an Edelbrock carb. i will be driving along and suddently you feel the truck begin to slow in speed, the throttle doesnt respond and when you come to a complete stop the RPMs which usually run around 1000 are down to 250. It will run well but sputter when engine is under load going uphill. RV with Chevy 454 engine problems: Mark: 9-9-09 : I have a 1986 El Dorado motor home with a chevy 454. To get more accurate measurement of power rating, the engine should be placed under load using a dynamometer or dyno. I have a 2014 Rav4 and recently changed the Transmission. Older vehicles with carburetors require maintenance and cleaning to keep fuel and air flowing correctly. Many people probably just ignore the check engine light when it comes on, but it can be triggered by a number of issues. This is a homemade rat rod built form parts of a chevy, school bus, and other various parts. Dirty Fuel Injector. The engine misfires or runs rough when it is fully warmed up at constant speed or stopped and really bad when pulling a load up a hill or when power breaking. That's a long story from when my project began. Took my dad's truck for a spin and it sure seems to have some loss of acceleration and it's only around 130,000 km. Schedule Check Engine Light is on Inspection. Retractable running boards. of the time it's. Than the the starter is new the rotor and cap are new the control madule the iac is new fuel filter in line is new plugs. There are many factors which affect horsepower. 1 compression. Checked for vaccuum leaks, reset base idle, tested sensor components, ran Win aldl diagnostics, could not get it to run right. Chevy SUV & Crossover Tech Forums. The 1409 has worked great on a couple other vehicles too. After removing the valve covers I noticed a rocker laying next to a snapped stud, another rocker able to spin, and a missing pushrod. i will be driving along and suddently you feel the truck begin to slow in speed, the throttle doesnt respond and when you come to a complete stop the RPMs which usually run around 1000 are down to 250. tested fuel pressure - steady at 55 at idle, goes up a little. 5 gallons of V-Power in. When I drive the truck the engine light will go on and off. Runs just as rough at idle or higher RPMs. If the engine is not making noise (i. 0 L engine, any experiences? - posted in General Discussion: I am considering a different truck and the one I am looking at has the 6. Within about 50 miles of home topped off (half tank) with 89 octane to see if it would help. https://www. If the noise disappears or lessens substantially when a wire has been removed, that cylinder will be the likely suspect for a bad rod bearing. 7L Vortec surges while accelerating and driving The truck will idle fine except for the occasional rough idle in gear during the times the truck is running badly. If the damage is bad enough, you may also notice your engine running rough while driving. The Chevrolet truck ignition switch problem is commonly found on two separate generations of Chevy pickup trucks and sport utility vehicles. Hei is hooked to ported vacum on the carb. My 1990 Chevy Silverado 5. You definitely won't fit a 35 unless you do some major trimming and turn the torsion bars up. of gas and added 4 oz. These impressive numbers are a result of a perfectly balanced inline six configuration as well as advanced features like stop-start technology and a Hydra. Once you learn that the problem is not in the ignition or with. Includes: Plain Premium Black or High Carbon Alloy Rotors and Posi Quiet Premium Pads. We need both because on the street we can have low load at very high engine speeds, say 6,000 with the throttle barely open or very high load (WOT) at very low engine speeds like 1,500 rpm. I have a problem with a 98 Chevy 4x4 5. It used to chirp the tires a little. runs a little rough, while driving under normal conditions it sputters, hesitates, and also will backfire, under heavy acceleration no noticeable skip, no sputters, and does not hesitate or backfire. Intermittent misfires can be a real challenge to diagnose, so let's start. 7L TBI - Rough Idle/Stalling by AKupNorth Apr 10, 2018 12:56PM PDT (Let me try again. This can cause a rough running engine or stalling condition, the Check Engine Light may or may not illuminate. i with a 600 holley. Average failure mileage is 63,000 miles. Listen for any change in the clunking noise. When warm, it would take 3 turns/tries. You're probably going to need to turn the torsion bars up for 285s. dragonflyoffshore. 1998 Chevy 3/4 ton service truck. I had 1 gal. Service And Parts Special. These impressive numbers are a result of a perfectly balanced inline six configuration as well as advanced features like stop-start technology and a Hydra. I advanced the timing to 4 then 6* and it would run better with greater throttle response (less delay) however it was not driveable. That American tradition is why you own a Silverado, and it's. Feels like electrical to me, but who knows. Find a high quality auto repair shop or dealer. First is inefficient combustion chamber temperatures can create a situation where the fuel is not getting an efficient total burn. When cold, started up perfectly. 6 roller tip models. I have spent countless hours going over the engine looking for vacuum leaks and believe every thing is OK on that front. mammoth loads you’re hauling under control. went to leave work 4hours later and instantly noticed a misfire under load above 1500 rpm. of the time it's. 7 Idle surging,stalling in the alt. The carb I am using is a NOS Holley 9834-1 Here is what happens: Car starts fine hot or cold. I ran that with iron heads for years on crap Cali swill 89 octane. Research the 2017 Chevrolet Silverado 1500 at cars. I have a 1989 v3500 chev crew cab with a 454. Hurdt299, Jul 30, 2011. Well I checked timing first, and the timing mark is way off. This will allow for more air and fuel, create more power, and lower the manifold vacuum reading. 3, 130,000 miles. Fuel pressure checks out, 11. 5 LB7 Forums. Probably only need the. No worries. It screams; and it's the first time I have been impressed with an Edelbrock carb. I have a 97 Suburban 5. I own a 2004 silverado Z71 4. Preferred Plain Brake Kit by Centric®. 1 compression. Assuming your 350 has the stock cam , a Holly 600 will do it good. Cracked fly wheel usually gets louder as it gets hotter, or under heavier load. These kits cover the most popular types of suspension, including Coil Spring , Leaf Spring , Long Arm , and Spacer , with or without shocks, and they offer lift height ranges from 0-2 inches up to 6 inches. Gm engineers don't live at 3500 feet and drive in real world conditions so don't beleive the crap they put out. That was perhaps his best advice. Changed back to the original HEI distributor the with the plug on the side and my truck still runs really bad but idles great.
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