350 Tbi Runs Rough When Warm

It soon recovers generally without stalling. Came back out, truck started right up, but then when I put it in reverse she died. Within about 50 miles of home topped off (half tank) with 89 octane to see if it would help. 88 F-350 with EFI 460 Starting/Running Problems - posted in 80-96 Ford Truck Tech Support: I have a 1988 Ford F-350 with an EFI 460 engine. Normally, when this engine burns gas, the vapors and heated gases are vented away, so the engine can stay cool enough to keep running. 0 4 cyl mercruiser overheating at high rpm/hot water going out intake; 3. I have looked at the fuel injectors while the truck is warm and idling, and it is very obvious that it is pumping in WAY too much fuel. this engine runs rough when cold misfires and so on, then when hot while running at higher speeds it backfires through the tbi unit. any help? has new fuel filer, × We use cookies to help our site to work, to help us understand how it is used, and to tailor advertising on this and other sites. afroman006 1/2 ton status. but is it really worth keeping and building up? or should i leave it alone? or get a new engine?. A customer with a Mazda 626 and a four-cylinder engine had a very rough engine idle. Engine electrical, distributor parts recently replaced. As you can tell, it doesn't deliver. Rough idle but otherwise runs fantastic (1993 Chevrolet C1500) Truck runs great when driving down the road and idles smooth for a couple minutes after coming to a stop. it was still dropping the rpms really low when coming to a stop. It won't start back (even with ether) for another hour or so and the cycle repeats itself. After doing some checking online I see thermostat temperatures listed for the TBI engines from 160, 180, 192 and 195. 7) but no from GM they have a different color code on top and run lean (or if its a 305 then 350 injectors would run rich) I have even ran a TBI unit from a 454 (7. I found that my E-350 began to vibrate mildly as if it had a bad driveshaft u-joint. I am so confused with all this. but yeah, thats what i was thinking. TBI Fuel Injection Conversion using a GM TBI EFI system! One of the most popular EFI conversions to older Chevy engines or any engine for that matter is the GM TBI system using the 1227747 ECM. 7 engine out of a 98' K1500. Already replace. 7L 350 Mercruiser Stalls when warm?? something I failed to mention, the boat runs well until it warms up. When it's sat for a while and I start the engine, it idles at about 1200rpm for the first couple of minutes, then drops down to about 900rpm, and a little while after that drops down to 6-700rpm where it idles at when warm. Normally, when this engine burns gas, the vapors and heated gases are vented away, so the engine can stay cool enough to keep running. When riding after the warm up period the engine pops, sputters, and oc. 454 Runs Rough. Stalling out and wont stay running. Two fuel injectors mounted on top of the throttle body inject fuel into the motor. Thunderbolt IV Distributor off a tooth? If you can set the timing without stretching the wires a tooth off doesnt matter,I suspect you have the valves too tight,to set them running and keep the mess to a minimum do it like this. Truck is running great again. Once the car has been running for a while and the engine is up to operating temperature I run into the following issue: When I stop at a traffic light the car goes into idle ok. 350 TBI/auto Rough idle & hesitating Everything was good until I stopped at a red light and the idle dropped really low and rough, when the light changed I tried to accelerate but had no power, stumbling and hesitating, felt like I was running out of gas but had almost 1/2 tank. I have a chevy 355 crate motor in my 78 Jeep cj7. i have to hold gas to floor to keep it running it eventually clears out blowing smoke and will run. So just a little bit of base tuning in the driveway and. Happened twice, about every 40k or so. They routed them between the block and the firewall. Starts and runs/idles rough until you accellerate some the it smooths out and runs like it should. I would like to mention that to start the saw it takes 3 choked pulls before it pops, release choke and starts on the next pull. In the "Old" days, that was a stuck choke. If the engine dies after warming up, it is likely the engine is overheating and automatically shutting down to prevent more serious damage. Again, I have a 1990 K5 Chevy Blazer with the 350 TBI. Many people have had problems with their Dodge Ram 1500 running rough. It's likely you've experienced a rough idling vehicle - which just means the car feels rough and bouncy when the engine is running. When it's sat for a while and I start the engine, it idles at about 1200rpm for the first couple of minutes, then drops down to about 900rpm, and a little while after that drops down to 6-700rpm where it idles at when warm. It starts and runs great in warm weather ( above 70 deg). Back fire could be a cross firing on a cyl when the exhaust valve is open or some gas accumulation in the exhaust system from one cyl not firing. Hello, Im new here to this forum and have a question for ya on my 05 raptor 350. After i drive it for 10 minutes the check engine light will come on but it still runs the same as when i baught the truck. Dropped the boat in the water yesterday, she started right up, but under acceleration the engine is cutting out and has reduced power. I have a 88 chevy 350 with TBI suburban. in the summer when i cut my heater off mine would run hot. it was still dropping the rpms really low when coming to a stop. I found that my E-350 began to vibrate mildly as if it had a bad driveshaft u-joint. The purpose of this article is to highlight some of these common problems and how to fix them, so your mighty "Five-Oh" runs just as good, if not better than it did during the Reagan/Bush Sr. TBI is a fuel injection system that uses a pair of injectors mounted in a single housing that is mounted and functions much like a carburetor, except that the injectors replace the venturis, jets, air bleeds, fuel bowls, and floats. 7 GSi with TBI worked on by a shop here in San Diego (I wont mention any. It will not care about any sensor inputs when in open loop thus if running good you know its relative to sensor input. Runs good for 20 minutes, then dies and won't start until the next day is cold but it is really warm, it can cause it to run poorly. They didn't seem concerned with the engine idling problem. 7L TBI Mercruiser with Bravo 3 drive on a Sig 260. It starts and runs great in warm weather ( above 70 deg). Discuss 1990 TBI 5. Now when its cold it runs really rough coughing and sputtering. cleaned everything up with throttle body cleaner. i started it to move the other day and it ran perfect with all throttle input for about 2 minutes. Again, I have a 1990 K5 Chevy Blazer with the 350 TBI. When the engine heats up , any wire that is touching a metal surface can melt and a hole develops. In the "Old" days, that was a stuck choke. Idle problems may originate in a worn out component, a. 71 chevy with 350 engine, edelbrock intake and 600 cfm carb setup, new HEI distributor put installed, 8mm spark plug wires. he said it was running good for a while and then it started running rough, and im guessing it was because that much pressure from the fuel pump messed up the pressure regulator on the TBI. i have a chevy 350 5. We bought an '89 Chevy K1500 with a 350 in it and 224k miles, with the nasty Getrag trans I knew nothing about until after purchasing the truck. The day after I drove in a snowstorm the vehicle began to run rougher, and sounded similar to a lawnmower while throwing no check engine light and no DTC's. 18436572 firing order. I took my '75 stock 350 maro out for a Hwy. One of the most common problems is likely a rough running or poorly idling engine. Valve springs are also VERY important due to the stock ones having a redline of 4500 rpm. A gas-powered leaf blower uses a combustion engine to generate power. My instructor went with the carb heat all the time when you reduce the power, so I still do. It will consistanly shut off when warm and shifting into gear. It idles fine and runs great but after a ride if I shut it down and try to start it up after 5-10 min it wont start unless I floor the gas pedal (like if you drive to the store and then come out a few minutes later and try to start). why can't I just get my vehicles to run right for one week? I think the oil pump crapped out in the xj, so now I'm driving the 93 chevy, heres whats going on: 1993 chevy k1500 - 5. Back fire could be a cross firing on a cyl when the exhaust valve is open or some gas accumulation in the exhaust system from one cyl not firing. 89' 1500 350 TBI rough running, any help appreciated a few weeks ago the truck started running rough when taking off as of late is that it does it far worse. Requirement for the 50 to 52 mm throttle body: the intake manifold has to be counter bored to 52 mm intake bore size. Ive had a 91 5. Truck is running great again. Discuss 1990 TBI 5. But still a 5. The duty cycle is different for a marine engine, so you would have to modify the ECM software. it was still dropping the rpms really low when coming to a stop. Feb 1, 2019- Explore Michael Hathaway's board "Chevy 350 t. 350 TBI with turbo 350 trans. chevy forum at Car Dealer Forums; Truck runs great, but recently when the engine comes off the enriching circuit. Cranked it back up, shifted into R and it died again. Valve springs are also VERY important due to the stock ones having a redline of 4500 rpm. (SQUARE BODY TRUCK) Anyways, the engine was rebuilt fully in 2002. Its most noticeable if I'm pulling out of a parking lot where I'm driving at low speed with gentle acceleration. There are several reasons why this happens - some major and some minor. i just got the truck and am unsure of all the wrong things that were done during the 350 swap. but it runs great when accelerating or about 60mph and faster almost like nothing is wrong with it. In the "Old" days, that was a stuck choke. TBI is a fuel injection system that uses a pair of injectors mounted in a single housing that is mounted and functions much like a carburetor, except that the injectors replace the venturis, jets, air bleeds, fuel bowls, and floats. One of the most common problems is likely a rough running or poorly idling engine. My TBI 350 engine runs great when cold, or any other time, but not when hot and at idle. But once it's warm, it sputters, missess and backfires. chevy forum at Car Dealer Forums; Symptoms are as follows: When first started it runs fine for a few seconds then. I plan on changing the fuel/water separator filter, clean the spark arrestor. 7L TBI Mercruiser with Bravo 3 drive on a Sig 260. New engines WILL run hot for the first 500 miles, especially if you kept the clearances tight. I have a 1991 GMC Sierra 350 5. 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. The strange thing is, the truck seems to run a little better with the plugs gaped at. Again, I have a 1990 K5 Chevy Blazer with the 350 TBI. com : Car complaints, car problems and defect information. I have a 91 GMC 2WD 350/TBI with 135,000 miles. Posted by Rick from Paso on January 07, 2004 at 18:45:09 from (63. (SQUARE BODY TRUCK) Anyways, the engine was rebuilt fully in 2002. I have a 91 Silverado K1500 4x4, 5. 7) by changing the injectors and the use. 0L) and LO5 (5. Valve springs are also VERY important due to the stock ones having a redline of 4500 rpm. 3L TBI, wire the dark colored wire usually purple to the computer and the other wires to a ground and 12v ignition on HOT. Jeep idles high when started, goes down to normal idle, and once warmed up will idle rough and low, 600-700. Suburban stalling issue. However it idles rough on ocasion. problem is that i cant seem to get the truck to idle or run correctly. chevy forum at Car Dealer Forums; Truck runs great, but recently when the engine comes off the enriching circuit. GM Throttle Body Injection 1987-93 LO3 (5. 0 is very similar to a 90s gm truck motor) had 02 sensors and a lot had knock sensors. I have replaced plugs, wire, pick up coil, ignition coil, rotor and fuel filter. New engines WILL run hot for the first 500 miles, especially if you kept the clearances tight. left it alone because it's too cold out. 4) on a 350 (5. Even during driving it would lose power. this engine runs rough when cold misfires and so on, then when hot while running at higher speeds it backfires through the tbi unit. Rough idle and stalling after coming off the highway. You need revs. Again, runs smooth at idle and even Revs smoothly but only when the truck is in park. Had recently filled up and thought it might be bad gas. They typically accelerate up to three quarter throttle (or full throttle if your one of those) and then run for long periods at. The glue on the elbow near the TBI turned to liquid when the engine got warm and the hose would not hold a vacuum. i had to make a bypass with my heater hose. When I start it. Re: 1988 350 TBI idles funny, stalls when put in gear, and accels rough Fixed! After rebuilding the fuel pressure regulator, new fuel filter, plugs and wires, I finally dropped a new fuel pump in and seems to be running like a champ. If your chevy gm tbi is running rich this will help you trouble shoot it and fix it Don't Forget to Subscribe today for more fact or fiction, diy ,how to car repair,spooky or funny videos uploaded. I have a 91 GMC 2WD 350/TBI with 135,000 miles. After its warm it runs just fine. Hello, I'm new to the forum. 71 chevy with 350 engine, edelbrock intake and 600 cfm carb setup, new HEI distributor put installed, 8mm spark plug wires. There are many others that will do the same thing but the 1227747 is most well known and documented and will be the basis for this article. On the road down Millers towards Hungry Valley, I noticed it "stumbled" on right hand turns. It will start and run up to about half throttle and then it starts to miss. Last night, I drove it when it was super cold and even after warming up, it will did not idle correctly. thanks for that Moses, tomorrow morning i will run those tests to make sure the adjustments are in spec. Engine wont idle/ Runs rough Volvo 5. This cam is designed specifically for the TBI 350 small-block and specs at 194/214 degrees of duration at. I plan on changing the fuel/water separator filter, clean the spark arrestor. 18436572 firing order. Engine skipped occasionally and would pop-pop-pop under heavy acceleration. The truck runs pretty good in drive when it is warmed up. has a new top end and some bolt ons. 7 SHORT BLOCK-4 BOLT MAINS. why can't I just get my vehicles to run right for one week? I think the oil pump crapped out in the xj, so now I'm driving the 93 chevy, heres whats going on: 1993 chevy k1500 - 5. when shut off or stalls it wont start unles gas is held to floor and once it starts i 4 Answers. Normally, when this engine burns gas, the vapors and heated gases are vented away, so the engine can stay cool enough to keep running. chevy forum at Car Dealer Forums; Truck runs great, but recently when the engine comes off the enriching circuit. but after a couple of mins it straitens out and runs great however it is running rich and im only getting 8 mpg. 4 Engines 1985-91 (w/o the 4L60-E or 4L80-E transmissions): Our harness upgrades to the 1988-90 CK truck computer. The purpose of this article is to highlight some of these common problems and how to fix them, so your mighty "Five-Oh" runs just as good, if not better than it did during the Reagan/Bush Sr. Runs good for 20 minutes, then dies and won't start until the next day is cold but it is really warm, it can cause it to run poorly. Today you don't have a choke so it is either a sensor or the brain saying, "I'm cold" and wants another log on the fire. Re: Mercruiser 350 MAG MPI -02 need full trottle to start when warm You have a stuck injector. A couple of times it has even stalled out. When im driving it doesnt skip a beat, but at an idle it will run rough and miss on that cylinder. Re: Chevy 350 rebuilt motor running rough. After doing some checking online I see thermostat temperatures listed for the TBI engines from 160, 180, 192 and 195. so would i have to put some kind of in-line regulator on it to reduce fuel. Problem is when I first start the truck in the morning (or after sitting awhile) and go to take off, it will chug, bog out, or barely go for a few seconds, then snap out of it and run fine. After a brief cooling off period, it is back in the fight. 3L V6 engine, and it very suddenly developed this loping, stuttering idle problem. It is available online at DodgeRam. Still running hot at idle and low speed cruising (15-35 MPH) most likely an air flow problem but could be a tuning issue like timing or an over rich condition. afroman006 1/2 ton status. why can't I just get my vehicles to run right for one week? I think the oil pump crapped out in the xj, so now I'm driving the 93 chevy, heres whats going on: 1993 chevy k1500 - 5. My 89 chevy k1500 350 TBI will die after it runs for a bit and warms up then when u wait a couple minutes itll fire back up. It feels like an old carb with a bad. Once it's warmed. 73's, I don't have a great crawl ratio, but I could pull it from a bog to full throttle quickly and with no problem. 7 tbi run like a bag of sh*t only after it got warm from a lazy o2 sensor. It will not care about any sensor inputs when in open loop thus if running good you know its relative to sensor input. I have had it in the MC shop several times over the years. thanks for that Moses, tomorrow morning i will run those tests to make sure the adjustments are in spec. My questions are related to running the engine long enough to let it warm up and maybe settle down. it did the same until warmed up, then ran normal. It's likely you've experienced a rough idling vehicle - which just means the car feels rough and bouncy when the engine is running. Get a fuel pressure gauge, attach to fuel rail, turn the key to the on position to allow the fuel pump to prime and DO NOT START, once the fuel pump runs and the pressure comes up (1-2 seconds) the fuel pump shuts off. Feb 19 2012, 5:20am. If you try to put it in gear it dies. Several things could be causing rough running or a misfire in your 6. evidently there is no bypass in the heads or block. See more ideas about Chevy, Chevy pickups and Pick up. Details: A condition of running rough can be one of many factors. When the engine heats up , any wire that is touching a metal surface can melt and a hole develops. New and Remanufactured Throttle Body Assemblies for 305, 350, 454 Chevy, GM, GMC Trucks, Cars, Vans and 6 Liter and 7 Liter Trucks. Starts and runs/idles rough until you accellerate some the it smooths out and runs like it should. I could be driving 60 mph and it would just run terrible and then surge again and have full power. What causes 350 Chevrolet engine to miss after it warms up? possible bad plug wires. Greetings all. It will consistanly shut off when warm and shifting into gear. Re: Which is the #1 wire on a Chevy 350. 7L engine and the fuel filter has been replaced I cleaned the injectors out and put a new gasket on. It will start and run up to about half throttle and then it starts to miss. Third time I kept my foot on the gas a little and made the shift and it stayed running. 1993 Chevrolet Silverado The truck will start and once it gets warm it will idle,but put it in gear the engine will bog down won't accelerate, it's driving me a little crazy. It'd start running rough, new wires cleared it up. i have a 95 z-71 that starts right up but wont stay running! new distribitor rotor,fuel filter,plugs,tbi's dumping gas. Also the injectors are different between the 3 engines too, some will say or tell you a 305 (5. It runs like it's misfiring and occassionally "backfires". I have a chevy 355 crate motor in my 78 Jeep cj7. CEL came on but father in law doesn't have a scanner to check and I'm 2 hrs away. new, never run engine; originally purchased for a project vehicle but decided to go with another engine. TBI Fuel Injection Conversion using a GM TBI EFI system! One of the most popular EFI conversions to older Chevy engines or any engine for that matter is the GM TBI system using the 1227747 ECM. After about 10-15 minutes the engine does not want to idle. full size blazer with a. Hello, Im new here to this forum and have a question for ya on my 05 raptor 350. As you can tell, it doesn't deliver. A failing oxygen sensor can also cause a car to run rough while idling, but it won't affect the car while driving. Engine skipped occasionally and would pop-pop-pop under heavy acceleration. did not fix the problem and now throws codes 33 and 34 even after 3 different map. i don't know what else to replace. I would like to mention that to start the saw it takes 3 choked pulls before it pops, release choke and starts on the next pull. I have a 91 GMC 2WD 350/TBI with 135,000 miles. Find out what they are and how to fix them at Hot Shot's secret. 94 Chevy Truck surges at idle in gear, loss of power under accel? I just bought a 1994 K2500 w/ 5. When the engine heats up , any wire that is touching a metal surface can melt and a hole develops. It will start and run up to about half throttle and then it starts to miss. I have a 95' Chevy with a fuel injected 350 TBI. In this tech article HOT ROD shows you how to hop-up a Chevy 350 engine equipped with the sequential central port injection (SCPI) fuel system with a Comp Cams camshaft - Hot Rod Magazine. 7 tbi run like a bag of sh*t only after it got warm from a lazy o2 sensor. I have a rough idle when the engine is hot. but after a couple of mins it straitens out and runs great however it is running rich and im only getting 8 mpg. Valve springs are also VERY important due to the stock ones having a redline of 4500 rpm. so would i have to put some kind of in-line regulator on it to reduce fuel. If I push in the throttle even 1/8th of the way in it just sputters and runs like crap. Unlike a port fuel injection system, that sprays fuel into the intake manifold runner just above the intake valve, the injectors in this system spray fuel directly into the throttle body. Acceleration is good. 89 so it pretty much sounds balls-out at any speed over 25mph. The day after I drove in a snowstorm the vehicle began to run rougher, and sounded similar to a lawnmower while throwing no check engine light and no DTC's. 73 Answers I have a similiar problem as devin, my 95 Sierra 4x4 it has a 350 5. Marine engines run under a heavy load constantly (much like trucks) but do not have transmissions. It seems as though it shut of an on in a split second as im driving it. Re: 350 tbi rough idle no power Feb 20 2014, 3:43am My distributer did in my 88 K1500, replaced and it fixed most of the issues because for some reason it was causing voltage fluctuations. When i drive down the road and the motor is at about 2000rpm and up, it backfires out the exhaust quite frequently. It has an edelbrock performer package (cam/intake/carb) it has a mechanical fuel pump. 87-95 tbi chevy 350 5. i have a early 90,s 350 block with vortec heads and carburated intake. The Chevy 350 engine is a 350 cubic inch (5. Happened twice, about every 40k or so. It will not care about any sensor inputs when in open loop thus if running good you know its relative to sensor input. Boat runs rough and cuts ff when warm/hot Welcome to TheMalibuCrew! As a guest, you are welcome to poke around and view the majority of the content that we have to offer, but in order to post, search, contact members, and get full use out of the website you will need to Register for an Account. ThrottleBodyInjection. Hello, I have recent freshened up my Holley 4160 600cfm carb. 0 liter mercruiser running rough at high rpm; 3. 3L TBI Rough Idle Problem Hello, I have a 1988 Chevy S10 Blazer with the VIN Z 4. 7 engine out of a 98' K1500. Before it dies it never shows and sign of running rough. If the engine dies after warming up, it is likely the engine is overheating and automatically shutting down to prevent more serious damage. 73's, I don't have a great crawl ratio, but I could pull it from a bog to full throttle quickly and with no problem. why can't I just get my vehicles to run right for one week? I think the oil pump crapped out in the xj, so now I'm driving the 93 chevy, heres whats going on: 1993 chevy k1500 - 5. I have a 1991 GMC Sierra 350 5. TBI intermittent stumbling/backfiring under load, now idles rough intermittently Discussion in ' Engine Performance + Maintenance ' started by thunderstruck , Feb 17, 2014. Sometimes it would stall just sitting at idle, sometimes after putting it in gear, and other times after turning on the ac at idle. com specializes in (OEM) original equipment TBI Assemblies. That should put the truck into open loop. this works for me if you have. 3L TBI, wire the dark colored wire usually purple to the computer and the other wires to a ground and 12v ignition on HOT. It won't start back (even with ether) for another hour or so and the cycle repeats itself. Also in 1999 (when mine was made) all fuel inj car and truck motors (the 5. 7L Chevrolet truck. 0 4 cyl mercruiser overheating at high rpm/hot water going out intake; 3. The Chevy 350 engine is a 350 cubic inch (5. My 89 chevy k1500 350 TBI will die after it runs for a bit and warms up then when u wait a couple minutes itll fire back up. Worked when it was on the truck, but wouldn't die when the passenger idle screw was turned all the way in, so I thought the metering block was plugged. 7L 350 MAG 7. '91 Chevy 350 TBI surging at idle and stumbling at speed Howdy - My father in law's '91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it's running better, but it it still surging at idle. It's on top of a 5. [Response: Chris Mullet] When it's running rough try to identify a particular cylinder that might be the problem by pulling spark plug wires one at a time until you find one that has little negative effect when removed. New Quality Hand-Built in America Chevy 350 Small Block Engines for Sale for Your Street Performance Hot Rod, Muscle Car, or Classic Truck! Available in Short Block, Long Block, and Custom Crate Engine Packages. 87-95 tbi chevy 350 5. 94 Chevy Truck surges at idle in gear, loss of power under accel? I just bought a 1994 K2500 w/ 5. When engine hot on the highway, when second venturi of carb is opened the engine seems to die momentarily. A failing oxygen sensor can also cause a car to run rough while idling, but it won't affect the car while driving. It has an edelbrock performer package (cam/intake/carb) it has a mechanical fuel pump. Acceleration is good. I have a 91 Silverado K1500 4x4, 5. #1 cylinder is closest to the radiator (not always the case on Fords). Rough weather hit a few days after the install and I had to wait for spring to. 7L, TBI, 260K on the motor at idle, it's extremely high, around 1600-1800 RPM's when put it drive, drops down to about 1000-1200 (still way too high) I've put a new IAC (idle air control) valve in, checked my timing. this problem happend suddenly and im not sure if it is a cap&rotor or timing chain. Posted by Rick from Paso on January 07, 2004 at 18:45:09 from (63. 7 tbi runs rough cold and Discussion in 'Chevy Trucks' started by russ130, so that the tbi gets warm air from your exhaust manifold, and as your. Again, I have a 1990 K5 Chevy Blazer with the 350 TBI. Re: 1988 350 TBI idles funny, stalls when put in gear, and accels rough Fixed! After rebuilding the fuel pressure regulator, new fuel filter, plugs and wires, I finally dropped a new fuel pump in and seems to be running like a champ. I have a 1991 K2500 with the 5. 7 Idle surging,stalling in the alt. 2L 502 MAG Horn Output Possible Cause Corrective Action Engine Usage Available For Consumer Key on, engine not running. 7L, TBI, 260K on the motor at idle, it's extremely high, around 1600-1800 RPM's when put it drive, drops down to about 1000-1200 (still way too high) I've put a new IAC (idle air control) valve in, checked my timing. net - Car Forums, Automotive News and Community. 350 TBI won't start when timing bypass is disconnected / unplugged was created by Napy134 Hey guys, I'm new to this forum and new to owning my first chevy truck (with a small problem - hopefully!) and I wanted to post this here for some help/advice/guidance. Re: 96 Jeep Cherokee runs fine then rough, then fine Just wondering if you found your problem, Sounds a lot like a problem I had with my 94, found a leak in the vacume line over by the cruise control modual, was just cracked and only found with a smoke maching. My 350 engine idles very rough, as if some cylinders were hitting harder than others or some are intermittently missing? Just above idle the engine smooths out and performs well. all original harness came out of the suburban and straight into my buggy. Once it's warmed. Rough idle and stalling after coming off the highway. Nevertheless, the two issues were linked together, because the engine was running on three cylinders. This is called base CFM range 670, 700, to 800+ CFM (cubic feet per minute). If you have access to a scan tool use a hook up for a 1990 350 cu. GM uses most of the same sensors on a throttle body as they do a tuned port engine. 1995 Chevy k1500 4X4 350 run problems when cold and wet. Chevy 350 Hard To Start When Hot Flooding I have a chevy 355 crate motor in my 78 Jeep cj7. 0 liter mercruiser running rough at high rpm; 3. A couple of times it has even stalled out. It won't start back (even with ether) for another hour or so and the cycle repeats itself. Nevertheless, the two issues were linked together, because the engine was running on three cylinders. it runs like a champ and has smoked every truck that i have raced so far. It has a rough idle when cold but will run after it gets warm. left it alone because it's too cold out. Check out these First Generation 1996-1998 GM Vortec fuel-injected 350 Engine Power Upgrades, including exhaust, throttle body, and more, at Sport Truck Magazine. I have a chevy 355 crate motor in my 78 Jeep cj7. 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. Well, it didn't seem to idle rough until a few weeks after we bought it haha. Re: 93' K5 Blazer 5. Chevy 350 Hard To Start When Hot Flooding I have a chevy 355 crate motor in my 78 Jeep cj7. The TPI setup works great on the 305 cars but the extra displacement of the 350 or 383 can cause it to quickly become a restriction. I have a 1991 K2500 with the 5. 1990 Chevrolet K2500 350 5. -flat tappet camshaft and lifters with adjustable timing chain set; full gasket s. I have a 1991 GMC Sierra 350 5. it will run while. but it runs great when accelerating or about 60mph and faster almost like nothing is wrong with it. Nevertheless, the two issues were linked together, because the engine was running on three cylinders. 1988 Chevy 5. We noticed it more often as the nights have been getting cooler and the summer has come to a close. 4 Engines 1985-91 (w/o the 4L60-E or 4L80-E transmissions): Our harness upgrades to the 1988-90 CK truck computer. You can use a late 80's or early 90's GM TBI definition. Feb 19 2012, 5:20am. I have a 1990 K1500 5. Greetings all. 94 chevy k1500 350 tbi: in the morning when it is cold i start my truck and it runs rough with engine shaking and sometime dies. it has 186k on it. for a GM TBI application to read the data, or to check for stored codes. TBI is a fuel injection system that uses a pair of injectors mounted in a single housing that is mounted and functions much like a carburetor, except that the injectors replace the venturis, jets, air bleeds, fuel bowls, and floats. 0 mercruiser high rpm wide open and over heat; 350 magnum fuel cooler engine running hot at 4500 rpm; 350 magnum mercruiser overheats only at low rpms; 350 mercruiser boat overheating at high rpms; 350 mercruiser rough. Engine electrical, distributor parts recently replaced.