Chevy 350 Tbi Runs Rough When Cold

Silverado & Fullsize Pick-ups - 95 GMC misses/runs rough after warmup - Hey people I have a 95 GMC c1500 pickup w/5. The foundation of AFI is expertise. 3 liter v6, the problem is, it starts good idles great, goes good a low speed but when i go to get on it it bogs out, if i hold it to the floor it sputters and starts to come out of it but it dosent, ive changed the tcs and the thing that controls my vaccum system. This is a 2 year old AFI TBI system. My chevy 1987 chevy Scottsdale with a 350 tbi sometime runs smooth then sometimes runs like its running with half the power or less like it has bad gas or something. Again, I have a 1990 K5 Chevy Blazer with the 350 TBI. Like most people the winter is when i do whatever mods or repairs need to be done for the next show seasonI started the car and let it run once a week all winterI am in the process of finishing up a complete custom interiorIve had the doors open a lot and played. Discussion in ' Chevy Truck Talk & GM News ' started by Mowerwolf , Nov 22, 2017. is, the worse the truck runs. I had my 2001 Striper with Volvo Penta 5. 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. As American automobiles grew in size and weight following the Second World War, the engines powering them had to keep pace. I replaced the TBI gasket again, just to be sure. com FREE DELIVERY possible on eligible purchases. I have been all over the intake looking for leaks, because that was what I thought at first. Step in and out of your truck, van, or SUV safely and easily. 48 I have a 1990 chevy conversion van,350 tbi,no problem in 5 yrs I've had it. 7/350tbi), I just bought it from a used car lot and noticed it was running. Runs really rough as in jumping up and down when it's really cold outside but runs fine after it warms up. Quality of Construction This harness is constructed using OEM quality wire for superior reliability and long term use. My 1991 Chevy Silverado starts up ok, but has a rough idle until it warms up. If you have the throttle just barely open it will smooth out until it upshifts then it does it again until the rpms build. On a cold start it's running in open loop. The 350 HO small block crate engine has powered countless project cars since its '67 Camaro debut - see images, dyno specs, installation info and more. One of the most common problems is likely a rough running or poorly idling engine. I have a 91 Silverado K1500 4x4, 5. I've checked the timing and it's set at +2 degrees. It was idling a little slow, but no stumbling or backfiring through the TBI. So I have an 87 Silverado half ton. 7 Vortec - Duration:. Engine is from a 1974 Chevelle, rebuilt at time of install. for a GM TBI application to read the data, or to check for stored codes. Replaced: Distributor, Fuel pump, TPS, IAC, ignition coil, ESC, knock sensor, coolant temp sensor, O2 sensor, MAP sensor, ECM (reman). Q: Which way do you turn the distributor on a small block Chevy to advance the timing? We're having a family debate—I say one way, and my boys say the opposite! Also, I believe advancing the timing on a carbureted engine (without a choke) will help it start easier on cold mornings. I have been all over the intake looking for leaks, because that was what I thought at first. How to adjust valves on 1988 Chevy 350 small block v8? I tried following the repair procedure in the chilton's repair manual but now the engine has a distinct ticking sound coming from the engine valve cover area that I did notice before. The Chevrolet "Big Block" is a term for a series of large displacement V8 engines that have been developed and produced in the United States from the 1950s until 2009. Chevy 350 is backfiring/misfiring through the exhaust? It starts just fine but at an idle but smells like it is running way rich and when you rev to about 1700+ it starts to make popping sounds in the exhaust but stops when you bring it back to an idle. It was bored 40 over with the heads redone, a performer rpm intake, hei dist, headers, and now a holley 600. I've had 4 different times that the Jeep wouldn't start and I had to put the pedal to the floor and it started right up. 7 liter 4 V over heating / running rough Help Please ! 5: omc 4. 7l at the shop. We've got a '95 K1500 pickup with a TBI 5. Again, I have a 1990 K5 Chevy Blazer with the 350 TBI. 7 350 Will Start But Won't Stay Running. The truck is a 35K documented miles but we all know it's tough to know for sure. This thing runs great once its had time to warm up to about 150°. I have a 91 GMC 2WD 350/TBI with 135,000 miles. At speeds this will create a ram air effect pushing cool air into the tubing. 93' K5 Blazer 5. These vehicles featured a 350 ci, 5. Just got the MH running a couple of days ago with the rebuilt TBI, and let me tell you, there is a huge difference in the way the engine runs. 350 Chevy 440 Horsepower / 5 Year - 50,000 Mile Warranty… 454 Chevy Performance Engine / 475 Horsepower / 1 Year - 12,000 Mile Warranty… 454 Chevy Performance Engine / 3 Year - 36,000 Mile Warranty / we did research specifically for the application of this engine to motorhomes, call and talk directly with the owner on this one…. The truck has TBI, not a carb. No check engine light on but i will check any way i'm at a loss on what's going on. The check engine light came on then went off. It idles terribly. I have changed the idle air valve, the TPS, and the thermostat sensor without any results. Chevy Tbi running rich problem solving. Suburban: Rough Idle At Cold Start 2 Answers. Find many great new & used options and get the best deals for TNT Throttle Body TBI Spacer 88-95 Chevy GMC 1500 5. If its running rough when cold it may be because of open loop its running in, the computer will use presets for fuel delievery, any vacuum leak or fuel delivery issue, the computer will not compensate for untill it gets into closed loop, probably a few minutes of running on that old of a vehicle. Read on for further details along with more tech questions and. 7) with TBI. the customer left the vehicle overnight to allow us to see the problem. (1988 K1500 TBI 350) I discovered the hard way that an O2 sensor can test perfectly good at low speed, but provide false "lean" indications at highway speed. 3 liter v6, the problem is, it starts good idles great, goes good a low speed but when i go to get on it it bogs out, if i hold it to the floor it sputters and starts to come out of it but it dosent, ive changed the tcs and the thing that controls my vaccum system. This process facilitates a better mix with fuel for cleaner, more efficient combustion. The cooling system for the Chevrolet 350 engine consists of a water pump, a radiator and a thermostat. Anyway, we have been chasing a rough idle ever since we got it. If you hear excessive noises or the engine runs rough and poorly you will be doing the procedure again. the gauge should be still the same psi. I've been working on an El Camino with a 70's Chevy 350 of unknown condition. I have used propane, carb cleaner, and wd40 to try to locate leaks. In the "Old" days, that was a stuck choke. 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. Comes completely assembled. I personally dont think the opti is the root of all problems, ya its a pita but a well taken care of opti will last years. It was bored 40 over with the heads redone, a performer rpm intake, hei dist, headers, and now a holley 600. Reader Question My fiancé' bought a 1994 Chevy 3/4 ton 4×4, 5. CarComplaints. Any ideas?. Chevy 350 is backfiring/misfiring through the exhaust? It starts just fine but at an idle but smells like it is running way rich and when you rev to about 1700+ it starts to make popping sounds in the exhaust but stops when you bring it back to an idle. COM CHEVROLET CROSS-FIRE INJECTION 1982-1984 Model 400 TBI. 1987 Chevrolet Pickup for Sale 1987 Chevrolet C/K Pickup 1500 V10 has a 350 Crate engine and an This just in nfs yet. Read on for further details along with more tech questions and. got off hwy few eeks ago engine bogged down,kept stalling,I got stuck and was able to get it moving,running very rough 11. 350 tbi rough idle no power. I have a 350 SBC with cast-iron heads, hydraulic lifters, and just the stock stamped rocker arms. It came from factory with a 5. I have a 1987 350 TBI and it seems it takes more turns to start than it should. Fully-synthetic oil boosts efficiency of the engine by lowering carbon buildup as well as has superb, capacity to stay clear of cold-starts. So I have a 95 TBI 350 with about 190K miles on it. the alternator is good still because it charges the battery I parked the car in the garage last October for the winter. 1987-95 Chevy/GMC 1500/2500). Find a huge variety of 2018 Chevy Silverado 1500 Nerf Bars & Running Boards at RealTruck. Find CHEVROLET 5. Silverado C-1500 5. Mileage down from 13avg to around 8. If I use a '96 to '02 truck and van engine (it's a roller motor), can I swap in a roller cam with the same or similar profile as. r/MechanicAdvice: This is more than a car repair forum! most of the older 305 had bad camshaft wear. 89' 1500 350 TBI rough running, any help appreciated a few weeks ago the truck started running rough when taking off When the truck is cold it hardly does it. After doing some checking online I see thermostat temperatures listed for the TBI engines from 160, 180, 192 and 195. I just bought it about six months ago and can not resolve the surging idle issue. S-10 Cranks Wont Start. There are a several methods for a valve adjustment on a chevy small block engine. Free shipping available. Anyway, we have been chasing a rough idle ever since we got it. Run the aluminum ducting from the neck through the hole and affix it to the bottom of the car facing forward. 7L 350: Cam & Lifter Kits - Amazon. I can't explain why, but if I puch the accellerator to the floor and let it crank for about 5 seconds, it starts, idles rough, then goes on as if nothing happens. Every automobile enthusiast desires to drive a vehicle that goes faster than any sort of race car in the world. 94 sierra tbi 350 hard start and stumble problem i think when cold Mathieu Levesque. 7 fuel injected motor with a 700r4 automatic overdrive transmission Power windows , rear glass , door locks , Tilt wheel , Cold AC , Cruise. The 350 HO small block crate engine has powered countless project cars since its '67 Camaro debut - see images, dyno specs, installation info and more. 1987 Chevrolet Pickup for Sale 1987 Chevrolet C/K Pickup 1500 V10 has a 350 Crate engine and an This just in nfs yet. Again, I have a 1990 K5 Chevy Blazer with the 350 TBI. Each TBI has a complete one year warranty. Now when its cold it runs really rough coughing and sputtering. I installed new carb fuel pump fuel filter etc. '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. RTH diagnosing 1990 350tbi stumble/stall when warm. If you hear excessive noises or the engine runs rough and poorly you will be doing the procedure again. Headers into 3″ Exhaust and Flowmasters. 350 TBI with turbo 350 trans. I have a Chevy K1500 sierra with a 350 that is not EFI. Replaced fuel filter Here is the rest of the story. Great, problem herewater coming out exhaust and running very rough. 1990 Chevy C1500(5. City-Data Forum > General Forums > Automotive > Brand-specific forums > Chevrolet, Cadillac, Buick, and GMC: Do I use 10w40 or 5w40 in my 1990 5. I have a 91 GMC Jimmy which idles horribly (and it has even stalled) when it is cold outside (17* C or less) and it is the first start of the day. Why does A CHEVY 350 engine run flawless at idle but bog and sputter at wide open throttle? On a 1991 Chevy 350 tbi if your injector wires are crossed will it still run but only with a spit. this problem happend suddenly and im not sure if it is a cap&rotor or timing chain. 7 GSi with TBI worked on by a shop here in San Diego (I wont mention any. I was wondering where the issue may be. Now when its cold it runs really rough coughing and sputtering. 7 Runs terrible when hook to computer Page4 - Discuss Chevy High Performance, General Chevy Technical Discussion, and Chevrolet Tech topics in the Chevy High Performance forums at Super Chevy Magazine. This page is for information about GM Throttle Body Injection EFI swaps. 7 Vortec - Duration:. the customer left the vehicle overnight to allow us to see the problem. Except at this time most automakers who dabbled in fuel injection tended to have reliability issues. 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. 1990 rough running chevy truck. Reader Question. The problum is as follows. 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. 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. I had the fuel pump replaced and have been using Lucas Injector Cleaner with every tank of gas. 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. It idles rough, and has a slight miss. Discuss 1990 TBI 5. Great, problem herewater coming out exhaust and running very rough. Tore down to nothing. I have 1992 1500 chevy truck 4x4, Its always been a good running truck, has the 4. Problem: With the engine running at idle, always when cold, intermittent when hot. You need revs. No mileage figures yet, but I expect a slight improvement. When I get time, maybe I'll try cleaning the throttle body. Problem came back for about 30 seconds then ran smooth. I've had 4 different times that the Jeep wouldn't start and I had to put the pedal to the floor and it started right up. Re: 1995 TBI 350 with 214k stumbles a little at idle, otherwise runs great Took a 250 mile 5 hour drive today to get a Craigslist score of great condition wheels with 40% tires for $50. I'm wondering if there's a problem somewhere like bad intake sensors or something. (SQUARE BODY TRUCK) Anyways, the engine was rebuilt fully in 2002. First, check to make sure all the wires at your distributor are well insulated and AWAY from major sources of heat. Q: Which way do you turn the distributor on a small block Chevy to advance the timing? We're having a family debate—I say one way, and my boys say the opposite! Also, I believe advancing the timing on a carbureted engine (without a choke) will help it start easier on cold mornings. This thing runs great once its had time to warm up to about 150°. It idles rough for about 20-30 seconds (longer when colder) then smooths out to a normal nice smooth idle. This truck runs gr 1987 SWB Silverado TBI 5. These computer controlled fuel injection systems are less sensitive to shock and vibration that results from extreme 4-wheeling. There is alot of things this can be my truck did the same thing,btu this was when i put a new cam in it. Running very, down on power. The owner has replaced cap, rotor, plugs, wires, and fuel filter. Edelbrock is the most respected name in performance. Get it running and warm and it clears out and runs strong all day long with no further issues. Chevy Tbi running rich problem solving. It still idles weird, I'm really starting to lean towards a misfire at idle, so I need to go unplug the wires 1 by 1 and see if I get no change on one. No codes, Done the initial set-up, fuel pressure is 12lbs at startup and while running, no egr. Replaced fuel filter Here is the rest of the story. How to hop-up a Chevy 350 engine with a cam and fuel system. The problum is as follows. 1987 Chevrolet Truck rough running 350 tbi. It then bogs and backfires 2 Answers. These vehicles featured a 350 ci, 5. I was told it had a "cold start issue" when buying it, and he wasn't kidding. After replacing the IAC i still had the rough idle at cold start up and the hissing sound near the air intake/drivers side headlight area. 1999 Chevy Silverado - Sluggish Acceleration? 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. I have a 91 GMC 2WD 350/TBI with 135,000 miles. Loss of power and sputtering. Consult a service manual or see below for any check engine light code definitions. Chevrolet decided the 1982 Corvette would come standard with TBI equipped 5. 7 Idle surging,stalling in the alt. Howell Throttle Body Fuel Injection (TBI) for a Jeep CJ - 258 California Emissions Engine From day one, I have just been dreaming about a day when I could install a Howell fuel injection system on my CJ. So I have an 87 Silverado half ton. so there is nothing wrong with. The problum is as follows. Hi i have a 94 chev k1500 350 tbi. Valid on orders shipped in the contiguous United States. Note, this was built on a Small Block 350 Chevy motor from a 76 Monte Carlo (swapped into this Nova). hey john i stay in indianapolis and have the above rough idle at any rpm below 900 and hard cold start issues with carbureted 1968 307. It was idling a little slow, but no stumbling or backfiring through the TBI. I have a 350 SBC with cast-iron heads, hydraulic lifters, and just the stock stamped rocker arms. 7L Chevrolet truck. It's been in 3 other shops before ours. Although all of Chevrolet's siblings of the period (Buick, Cadillac, Oldsmobile, Pontiac, and Holden) designed their own V8s, it was the Chevrolet 305 and 350 cu in (5. Im kinda new at this. The cooling system for the Chevrolet 350 engine consists of a water pump, a radiator and a thermostat. 0L) and LO5 (5. remove valve covers. '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. I have used propane, carb cleaner, and wd40 to try to locate leaks. Also, if the CAT were clogged, the more gas I give it the worse it should run but its the opposite - it runs better with more throttle. It still idles weird, I'm really starting to lean towards a misfire at idle, so I need to go unplug the wires 1 by 1 and see if I get no change on one. ThrottleBodyInjection. I can't explain why, but if I puch the accellerator to the floor and let it crank for about 5 seconds, it starts, idles rough, then goes on as if nothing happens. I have a 1994 Chevy S10 Blazer and after a trip i arrived back home and casually turned it off. Our intention was to run the original 2G carb that came with the. Hot or cold the engine has to turn about 4 seconds before it starts. Read on for further details along with more tech questions and. I had a 90 model, had the fuel injector fuse blow once, also had an injector wire break that caused the truck to quit running. Chevy S10 Blazer Engine Won't Start - Turns Over But Won't Ignite. 7 has been idling rough lately, although it's never stalled. Working on the rough idle problem When we were in town yesterday I purchased a new PCV valve for the van's engine. After messing with the connection, the truck’s power has mostly been restored. Its been fine for years untill 5 days ago. did not fix the problem and now throws codes 33 and 34 even after 3 different map. Working on the rough idle problem When we were in town yesterday I purchased a new PCV valve for the van’s engine. Here is problem: The engine has alot of power, shifts smooth ect. Engine wont idle/ Runs rough Volvo 5. 3 L GM tech = MW question = I have a 1999 Chevy Silverado that i bought about 2 months ago. 350 HO Small Block Crate Engine | Chevrolet Performance. This means if a 454 throttle body is chosen, it will be for radical (for off-road) application not desirable for the street. was throwing code 33 so i replaced the map sensor with a new one. remove valve covers. but after a couple of mins it straitens out and runs great however it is running rich and im only getting 8 mpg. 1991 Chevy 1500, 350 tbi won't start. I have a 91 GMC 2WD 350/TBI with 135,000 miles. dont think it went to engines that new but possible. Manufactures have removed these adjustments on modern vehicles. Hi, I am having a problem with my chevy 350 engine that I just installed back in August. This page is for information about GM Throttle Body Injection EFI swaps. 3 L auto Z-71! Power windows and locks runs and drives great, cold AC! 180K asking $4800 For any additional information please give me a call! Newburg $4,800. The Chevy 350 Engine: Everything You Need to Know May 13, 2013 Get the facts on the history and specifications of the Chevy 350 engine, finding replacements parts, and finding Chevy 350 crate engines for sale. One of the most common problems is likely a rough running or poorly idling engine. it idles rough and acts like its running really rich, then when you take it out to drive it, as soon as you step on it to put a load on, it cuts out and backfires. 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. I have a 93' Chevy K5 Blazer that developed a cold start issue just recently since the temps have started hitting the 40's at night here in Eastern Washington state. This started as a surging while driving at constant rpms. 80% of the time people jump to opti's. Hi, I am having a problem with my chevy 350 engine that I just installed back in August. spec is 26-32 for the 454 350 is 9-13psi. This is a 2 year old AFI TBI system. got off hwy few eeks ago engine bogged down,kept stalling,I got stuck and was able to get it moving,running very rough 11. I have a 90 Chevy 2500 , 5. 2L I-6 Engine and Drivetrain > OEM Issues > Rough Idle. if its the camshaft you will notice little movement on the rocker arm. Step in and out of your truck, van, or SUV safely and easily. 89' 1500 350 TBI rough running, any help appreciated a few weeks ago the truck started running rough when taking off When the truck is cold it hardly does it. I can't explain why, but if I puch the accellerator to the floor and let it crank for about 5 seconds, it starts, idles rough, then goes on as if nothing happens. manual trans 196,000 miles. There is 20k on rebuilt. Its been fine for years untill 5 days ago. I have a chevy 355 crate motor in my 78 Jeep cj7. Re: 1995 TBI 350 with 214k stumbles a little at idle, otherwise runs great Took a 250 mile 5 hour drive today to get a Craigslist score of great condition wheels with 40% tires for $50. New inventory arriving daily. no clue where to go now? 44: OMC Chevy 350 Rough. Check out our three recipes to pick up real power. 7/350tbi), I just bought it from a used car lot and noticed it was running. COM CHEVROLET CROSS-FIRE INJECTION 1982-1984 Model 400 TBI. So the problem seems to be that something is advancing the timing way out of range on cold start for 30 to 45 seconds, then it comes back to normal and runs fine. When i tried to turn it back on, it turned but there was no response. It was the distributor cap. Here is a very nice, freshly built 1957 Chevy Suburban. When it is warm the lower radiator hose is quite a bit cooler than the top hose which makes me think the thermostat may not be doing its job. It will still usually run fairly rough for a minute or 2. But NO ONE, and this includes the Chevy dealer, could find the problem. Although it runs when cold started, the engine "hunts" in RPM and engaging the tranny (700r4) will occaisionally cause it to die. Greetings all. As stated above, if you have access to a mechanic's stethoscope, you can set the end at the top of the rocker stud to listen to the noise a loose adjustment makes, which helps finding "zero" lash easier. The 265 cu in (4. if its the camshaft you will notice little movement on the rocker arm. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads. I have a 2001 chevy suburban 1500 2wd and I've replaced the plugs and wire set. This means if a 454 throttle body is chosen, it will be for radical (for off-road) application not desirable for the. However it idles rough on ocasion. 7 Runs terrible when hook to computer Page4 - Discuss Chevy High Performance, General Chevy Technical Discussion, and Chevrolet Tech topics in the Chevy High Performance forums at Super Chevy Magazine. Further information from the customer indicated that the truck misfired the worse in drive, not overdrive, at light to normal cruise around 2000 rpm to 2500 rpm. dont think it went to engines that new but possible. I have a 91 GMC 2WD 350/TBI with 135,000 miles. I just bought it about six months ago and can not resolve the surging idle issue. AutoZone Repair Guide for your Engine Performance And Tune-up Idle Speed And Mixture Adjustments Throttle Body Injection (tbi) Chevrolet Full Size Cars 1979-1989. The 1989 Chevrolet Silverado has 2 problems reported for engine running rough. 7l at the shop. 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. There is alot of things this can be my truck did the same thing,btu this was when i put a new cam in it. I had done one last fall but can't remember the number of quarts or the type of oil chevy recomends. a old carb hard to start,if your car runs great warm but hard to start when cold. I've tested every sensor on the engine, checked fuel pressure, checked for spark on each cylinder, even checked gap on all of the plugs. Anyone can take it for what its worth. The engine was running rough (misfiring) between idle and 1600rpm when cold. I found one on the pb port and repaired it. Buy Elgin Industries Torque/RV Cam+Lifters Kit w/TBI w/valve springs compatible with Chevy GMC 5. Manufactures have removed these adjustments on modern vehicles. See our Intake manifolds - Chevy. Contact us today to consign or buy a piece of history. But NO ONE, and this includes the Chevy dealer, could find the problem. When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss. All sensors are tested and verified, all tune up parts are new. Further information from the customer indicated that the truck misfired the worse in drive, not overdrive, at light to normal cruise around 2000 rpm to 2500 rpm. It seems as though it shut of an on in a split second as im driving it. 3 Stumbles on acceleration, rough running - Car Forums and Automotive Chat Automotive Forums. So I have a 95 TBI 350 with about 190K miles on it. My '89 K1500 with the 5. I know the choke is bad ( or at least pretty sure) because it doesnt do anything. my question is will a combination of a toque converter out of a v6 700r4 stall be too low (1000-1100) a oem alternator from 3. Replaced the engine and it starts and runs fine, until you drive it under load. Like most people the winter is when i do whatever mods or repairs need to be done for the next show seasonI started the car and let it run once a week all winterI am in the process of finishing up a complete custom interiorIve had the doors open a lot and played. 1987 Chevrolet Truck rough running 350 tbi. Headers into 3″ Exhaust and Flowmasters. Discuss 1990 TBI 5. RTH diagnosing 1990 350tbi stumble/stall when warm. However it idles rough on ocasion. I then unplugged the IAC and the idle sped up and smoothed outplugged it back in and it went back to rough. The truck has TBI, not a carb. What should the valve lash be set at (cold) for the intake and exhaust valves? Also how do I tell when I have #1 at TDC? I should have set it at TDC before I put the cylinder heads on I guess, but I didn't think about it. Started it Monday afternoon and the rough idle was back. Hot or cold the engine has to turn about 4 seconds before it starts. Buy products related to chevy 350 turbo kit products and see what customers say about chevy 350 turbo kit products on Amazon. 3 liter v6, the problem is, it starts good idles great, goes good a low speed but when i go to get on it it bogs out, if i hold it to the floor it sputters and starts to come out of it but it dosent, ive changed the tcs and the thing that controls my vaccum system. When staring with a cold engine it runs fine but, as soon as the engine warms up to operating temp (only a couple of minits) it will hesitate/stumble around 1200 to. It had some similar issues. The Howell Fuel Injection Conversion TBI Kit is an essential upgrade for your Jeep. 1994 Chevrolet C1500 Cheyenne 5. No mileage figures yet, but I expect a slight improvement. Cold needs more fuel than warm. If its running rough when cold it may be because of open loop its running in, the computer will use presets for fuel delievery, any vacuum leak or fuel delivery issue, the computer will not compensate for untill it gets into closed loop, probably a few minutes of running on that old of a vehicle. Join millions of people using Oodle to find unique used cars for sale, certified pre-owned car listings, and new car classifieds. for a GM TBI application to read the data, or to check for stored codes. It is of vital importance that the cooling system work properly, as a cooling problem can lead not only to an engine which overheats, but also to more serious problems such as a damaged head gasket or a cracked. Every TBI will be Flow Bench tested, calibrated, and idle adjusted making it ready for easy installation. It bangs and pops and sounds terrible for about a minute or so, then runs fine. I think I may have a temp wire for the timing unpluged but I'm not sure where to look. I'm wondering if there's a problem somewhere like bad intake sensors or something. Check out our three recipes to pick up real power. we performed a computer scan and found no codes in memory. I had the fuel pump replaced and have been using Lucas Injector Cleaner with every tank of gas. TBI fuel injection is a type of fuel injection system where the fuel is injected into the throttle body. 7L TBI - Rough Idle/Stalling Drove it to town last Friday. Although it runs when cold started, the engine "hunts" in RPM and engaging the tranny (700r4) will occaisionally cause it to die. So I have an 87 Silverado half ton. All sensors are tested and verified, all tune up parts are new.