350 Tbi Low Idle

I then changed the Ignition module, problem came back after 35 minues of. chevy 350 tbi issues Jump to page went on a test drive and it runs pretty decent. The only thing that makes me suspect you do not have a vacuum leak is the fact that it runs rich at idle with the 350 injectors. the car idles fine cold,but when it warms up it drops to 500 rpm than the computer makes it serge to 600-400 rmp than stalls. Idles great and runs great when warmed up. Edelbrock is the most respected name in performance. Funny videos and YouTube music. Then find the connector for the fuel pump relay in the right side kick panel near the computer and ground the tan wire. I have a 1990 K1500 5. Fuel economy should be fairly decent for a nearly 400-cubic-inch engine, especially if you use an overdrive transmission to keep engine speed low. Otherwise, the vehicle’s computer will have trouble adapting, and this could lead to stalling, erratic idle, over fueling, and generally poor performance. I have a home made billet 4bbl tbi I'm testing. Also stumbles and occasionally will stall when first started in the morning. Stocker 350 like you describe should be fine even with a relatively small radiator like a Mustang/Falcon unit. under propping (max rpm at WOT on the low end) can be very hard on your engine. as far as playing with it, i dont know, i was fooling with mine, it didnt really seem to hurt it none. Doovi is an ultimate portal that finds the best YouTube videos in seconds!. idle speed” is. I know it's a direct bolt and i'll need to swap to 32 spline input on my transfer case but what else would I need to do to make it work?. The other kit is the Mopar MPI but it typically costs twice the amount. FYI this is on my truck (383, TBI, Vortec heads). This started as a surging while driving at constant rpms. 7l tbi 2wd service bed 350 tbi won't idle or drive. 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. 1990 Chevy 350 tbi carb has bad idle? give it gas its fine but if you let it idle it goes from a low idle to a high idle a couple times then dies is it the ecmchip? an idle rpm for a 350. Usually a bad or failing idle control valve will produce a few symptoms that can alert the driver of a potential issue. Through succeeding years, the Corvette evolved from showcase car to a performance machine that typified the American lifestyle – fast, young and sexy. Ive got a 1992 GMC Yukon 2-dr 4WD, 350 TBI. New plugs,cap, rotor ICM,wires. Using a Torx T-20 Bit, adjust the idle speed screw (which is located on the front of the Howell TBI right next to the throttle control) until the low idle speed is at 750 RPM as stated by the manual. Immediately afterward it continued as normal. The ideal counts to see with the engine idling are mid to upper 30’s. Long story short, I have 2 1995 Chevy pickups now, both with 350 TBI/auotmatics, bought the latest one a couple weeks ago. Normally, it will strike after a drive on the freeway where my RPMs are above 2000. I suspect that when it is difficult to turn, the engine is at idle speed, which is set too at too low an RPM. We will see how this compares to what the “target idle speed” is set at in the chip. 3 is the same as the 350 minus 2 jugs. I suspect that when it is difficult to turn, the engine is at idle speed, which is set too at too low an RPM. 9k mode??? and 10K mode. Timing is set to 0 with the ECU wire disconected and about 25 with the ECU connected (all at idle when in closed loop). 7L HP RV Stage 1 368/398 Lift Cam Camshaft & Lifters Kit MC2199. Got a '94 Malibu ski boat with 5. Fast Idle - fast in neutral and drive gears, ridiculously fast in park. Ok here is my issue I have a 1993 k1500 with a 5. it should have an idle air control valve. The TBI base gasket can be a source of trouble, too. If you are going to spend the money to update your ride to EFI, spend it on a system that can grow with you in the future. When i first start the truck it slowly rises from 1000 to 1500 rpm then comes down after five minutes to 1000 rpm then when i drive it for a few minutes then it starts idling at 1100 rpm when the truck is in drive. It is a 91 chevy truck with the 350 (5. Set the idle speed to 450 rpm, rotating the Torx screw clockwise to raise rpm, and counter-clockwise to lower rpm. 350 small block knock at idle rpms i have a chevy 350 small block that knocks at idling rpms. As I recall, I got about 175-185 on the cylinders on that one. It idles rough for about 20-30 seconds (longer when colder) then smooths out to a normal nice smooth idle. While every factory Ford GT40 is special, some are more special than others. 5 liters TBI engines, the throttle body intake fuel rail pressure better be 14. The relay allows full fuel pressure until an oil pressure signal is detected - if none detected it shuts the engine off by killing the pump. sounds very similar. A good tune-up with high quality wires, rotor, and distributor cap can often permanently solve stalling. 94 Chevy Truck surges at idle in gear, loss of power under accel? I just bought a 1994 K2500 w/ 5. The truck has full power while driving. 1987 350 TBI block bored. I am talking idle to 4000 rpm. All stock 1995 GMC Rally van 5. Any easy and accurate way it to pull the return line off the throttle body and start the truck, If there is enough fuel the fuel should come out of the return line port at a decent flow, if its slow or not much comes out chances are you have a flow or pressure issue. 1990 cheyenne 2500 5. I have a 1990 K1500 5. P0122 Throttle Position Sensor/Switch A Circuit Low Input OBD-II Trouble Code Technical Description. It comes from the factory with a protective metal cap over it. 7L TBI from a 1991 C1500 with the 193 swirl port heads. Reset Idle Learn = The Idle Air Learning can be reset to a default value (16 steps) – by setting this control value to 1, and turning the key off and waiting for the system to completely power down. Diesel engine surging at low speeds. It seems if the butterfly is closed and not open enough to begin with, the ecm will never find the correct idle. Now the engine runs rough at idle and I can't seem to get it to hold 650to750 idle without holding the throttle control on the TBI. chevy 350 tbi issues Jump to page went on a test drive and it runs pretty decent. I & LG-4 V-8 applications. Hi! New to the forumhoping for some help! I've got a 1988 Z-71 Silverado with the 350 TBI. It came down to around 1500 after running for a few minutes. 3 liter V-6 engines. 7 tbI I have replaced every sensor on motor had igniton timing redone. This started as a surging while driving at constant rpms. i got some bosch iridium and they still have a long life ahead of them. i carry 40 psi at idle or park will stay that way for hours until i drive it. Pretty mild idle and still able to work with stock gears. New Coolant Water Thermostat. the guy that owns it converted it from carb to tbi himself using a factory gm computer and wiring harness. The idle control valve, also commonly referred to as the idle air control valve, is an engine management component that is found in one form or another on the majority of road going vehicles. The idle will relearn if you put the vehicle in drive and allow the idle to come down with all accessories off for about two to three minutes. Drop in Idle and/or stall when gas released. I have an idea, but I'd like to poll the group. There should be less than 1 psi of pressure difference from idle to WOT operation of the TBI unit. It comes from the factory with a protective metal cap over it. 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. the idle screw hole has little cover over in the front of the tbi on the side the throttle is on couldnt get picture up sorry. Also, the timing should be at 0 deg. This engine was designed to be a performance upgrade for a 1999-2007 Chevy Truck LM7 or LS swap in a hot rod. I will get a better pic tomorrow, weird lighting. The dazzling example featured here, chassis GT40P/1074, earns bonus points for at least three reasons. I have a 91 Silverado K1500 4x4, 5. If this sensor is out of adjustment or is failing, the result could be stalling, idle surge, flat throttle response, hesitation, or erratic engine operation. 9volts when driven extreme lean or extreme rich. For whatever reason you have determined that you need to adjust your base idle on your GM TBI vehicle. basically the entire ignition system short of the distributor are fresh. This can be a bit of a balancing act and require some very small adjustments and several iterations before both the high and low settings are where you want them to be. Roller cam set up, bored out intake to 2", 454 TBI™ unit with big inj. problem is that i cant seem to get the truck to idle or run correctly. 7L 350: Cam & Lifter Kits - Amazon. I will get a better pic tomorrow, weird lighting. the idle screw hole has little cover over in the front of the tbi on the side the throttle is on couldnt get picture up sorry. I suspect that when it is difficult to turn, the engine is at idle speed, which is set too at too low an RPM. I have taken it to a half a dozen mechanics, promising me that they could find the problem. The short duration helps it. I've had this truck for 10 years now, and over the past 6 months it's developed two problems that i'm not convinced are related. Part of why it runs so well was getting rid of TBI but it is a super mild cam and I'm sure it would be a big improvement even under a TBI setup. TRhere is the ETC Edelbrock 180 and 200 cc heads as well. They have like a sleeve that takes the place of that can. When i first start the truck it slowly rises from 1000 to 1500 rpm then comes down after five minutes to 1000 rpm then when i drive it for a few minutes then it starts idling at 1100 rpm when the truck is in drive. runs down the road great!. Loading Unsubscribe from hisbutlerdidit? chevy tbi base idle adjustment - Duration: 6:37. 07-10-11 07:10 PM - Post# 2112746 Hello, I have an 1987 Chevy truck TBI which has an annoying stall. 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. If I connect the vacuum advance to direct manifold vacuum it idles very smooth but idle timing increases to 36*. As a result, when you'd come to idle (and shut down), you couldn't start easily without pumping fuel. 7L 350 Marine Engine 3856395 - $799. manual says WOT rpm should be in the 4200-5000 range for my 350 tbi. I own a 1987 Chevrolet R10 pickup with a 5. HOWELL 2 X 2 TBI FUEL INJECTION KITS: low enough idle speed. IMO that the GM kit is the best choice. Cleaning the throttle body allowed more air to enter the engine, and the computer is compensating by adding more fuel. 0L) and LO5 (5. 2V)around a minute with the ecm is closed loop. Using a Torx T-20 Bit, adjust the idle speed screw (which is located on the front of the Howell TBI right next to the throttle control) until the low idle speed is at 750 RPM as stated by the manual. We've been having a problem with my son's 1988 Chevy K2500 4x4 w/ 350 for the past couple of weeks. After all of the idle mixture screws have been adjusted, you can finally adjust the curb idle speed screw so that the motor revs at the proper idle RPMs. Funny videos and YouTube music. 94 Chevy Truck surges at idle in gear, loss of power under accel? I just bought a 1994 K2500 w/ 5. The other kit is the Mopar MPI but it typically costs twice the amount. 0 in TBI applications. The short duration helps it. This cam has good low to mid torque with a noticeable idle. Also got the V8 Injectors which seem to be spraying normally. I bought a 1990 Chevy 1500 pickup several months back. My 1995 k1500 with a Tbi 350. 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. Specs for GM TBI is 11 PSI. It is a used stock engine and TBI electronics package and the 700R4 and transfer case out of a '90 Suburban in a 4WD Toyota Tacoma with 34" tires and (I think) 4. Richard CraniumMT 124,359 views. Low idles could also be caused by vacuum leaks. Just finished a 350 TBI / 700R4 / 3. Can be used instead of G2 adapter. sometimes a stall in open. Designed by Ed Cole's group at Chevrolet to provide a more powerful engine for the 1955 Corvette than the model's original " Blue Flame" in-line six, the 162 hp (121 kW) 2-barrel debut version went from drawings to production in just 15 weeks. When the air conditioning is turned on, the engine will stumble and stall at idle while in gear. Usually it is a plugged up filter. Rebuilding that TBI is very straightforward. It seems if the butterfly is closed and not open enough to begin with, the ecm will never find the correct idle. When I start it up cold, it idles high (which is normal) then idles down, but as soon as I put it in gear, and back to park, it sounds like a freight truck. How Set idle speed on Chevy TBI 350? [RPM]. When I start it, (starts every time) it takes about 3 seconds from cold start to fire up. If I put the truck in park or neutral the problem goes away and the truck will idle fine. Set the idle speed to 450 rpm, rotating the Torx screw clockwise to raise rpm, and counter-clockwise to lower rpm. 00 trying to find the problem for this. Repeat this process for all of the idle mixture screws. There was a trouble code 32 and code 42- EGR and Timing ignition. The only thing that makes me suspect you do not have a vacuum leak is the fact that it runs rich at idle with the 350 injectors. '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. 7L 350, TBI, Auto, 220Kmiles Its been a great truck, for the most part it runs and drives great! but at low idle or low rpm's it missis,sputters,surges and if im just barely giving it any gas it almost wants to stall out. TBI Fuel Pump & Fuel Line Routing. GM used the same 2" bore throttle body and 85 lb/hr injectors for low pressure, or 45 lb/hr injectors for the high pressure systems. My truck is an 87 R10 with the 305 TBI. RPM Pre-Set: We want to Make Sure The Carburetor Curb idle is Pre-Set, Not to Low and Not to High, A Low Curb Idle Setting will Leave the Engine Running Rough Causing a Poor Running Engine, However a High Idle will Leave the Engine Racing Causing a Rich Running Condition. 7L 350, TBI, Auto, 220Kmiles Its been a great truck, for the most part it runs and drives great! but at low idle or low rpm's it missis,sputters,surges and if im just barely giving it any gas it almost wants to stall out. hope that helps!. i like to set it as low as possible with engine still running smoothly. The valves were very clean and so was the bottom end. It has the automatic 3-speed with overdrive. lower end of engine completely rebuilt. 3 milliseconds or longer at idle with a. Using a Torx T-20 Bit, adjust the idle speed screw (which is located on the front of the Howell TBI right next to the throttle control) until the low idle speed is at 750 RPM as stated by the manual. Stocker 350 like you describe should be fine even with a relatively small radiator like a Mustang/Falcon unit. 350 TBI to 454 Carb engine and tranny swap. Sought after for its durability, quiet operation and performance, the 350 has also earned a reputation for reliability and usability in a variety of applications, including boats. 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. It comes from the factory with a protective metal cap over it. Hi! I am at the end with this truck! 1989 chev TBI 305 k1500. when the engine is cool, there is no knocking, but once it gets warmed up it starts aknockin'. But hardly anyone references the butterfly on the TBI unit not being adjusted right. in engine with manual transmissions. 60's shifting at 5000. With new thermostat it is about 165 F. Idles great and runs great when warmed up. 89 gmc 1500 350 tbi. maybe a day. With chip changes, mostly dialing in the fuel, raising the idle speed a little and more timing at idle. For that reason I strongly recommend that you remove your tank and have it professionally purged, cleaned and tested. New plugs,cap, rotor ICM,wires. The odds of getting a GOOD set that will work in a SBC is slim so I have been just cranking fuel pressure up on the 350 injectors on most SBC applications. Finally, find a 12" long 5/16" steel line with appropriate fittings and put it in place of your high pressure fuel pump. If you just want to start your build with a "TBI" short block , the TBI really means nothing. All stock 1995 GMC Rally van 5. this is my first car and first big project. Find many great new & used options and get the best deals for Chevy GMC 5. Warm Idle Speed = This is the Target Idle RPM for when the engine temperature reaches 170 degrees Fahrenheit. Good low-RPM torque, great pulling, offroad, good highway mileage. I have a 1992 Chevrolet K2500 350 tbi that idles high about 1200 to 1500 rpm sometime's will idle about 800 rpm. runs down the road great!. We Can Promise You the Curb Idle will be Set for a Plug-N-Play Setup. It has a great running LT-1 Fuel Injected V-8 Engine backed up with an automatic Over-Drive Transmission. Set the idle speed to 450 rpm, rotating the Torx screw clockwise to raise rpm, and counter-clockwise to lower rpm. 1984 GMC Caballero Diablo AKA El Camino Cloth We are pleased to offer this great 1984 GMC Caballero Diablo AKA El Camino. i got some bosch iridium and they still have a long life ahead of them. 10 with 35s. Had sat for 10 years but seller got it running and would idle and go up to 2500 rpm no problem. Cleaning the throttle body allowed more air to enter the engine, and the computer is compensating by adding more fuel. 5 now it s idle is so low it stalls. changed temp sensor, ERG, cleaned and rebuilt the TBI, replaced all vac lines, fuel filter, added sea foamand a few others. It seems if the butterfly is closed and not open enough to begin with, the ecm will never find the correct idle. Find great deals on eBay for chevy 350 tbi intake manifold. If that brings the idle down, then the throttle valve is sticking near the closed position, and you may need to replace the throttle shafts. I have a 1992 Chevrolet K2500 350 tbi that idles high about 1200 to 1500 rpm sometime's will idle about 800 rpm. If too low, adjust the TPS idle setting up slightly until you get at least 4. The other kit is the Mopar MPI but it typically costs twice the amount. GM 86-95 OBD1 Guide (READ ME) Socket Booster – required for use of Ostrich 2. checked all vac lines. There was a trouble code 32 and code 42- EGR and Timing ignition. If that brings the idle down, then the throttle valve is sticking near the closed position, and you may need to replace the throttle shafts. LMC Truck offers 4. The truck has full power while driving. I then changed the Ignition module, problem came back after 35 minues of. 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. Be prepared that when you're done and you start the truck up, the ECM will re-calibrate the IAC and the initial idle speed may be low or high. Also, the timing should be at 0 deg. This is what needs to be turned to adjust minimum air, or more commonly known as "idle speed". Also it will feel like its fighting or pulling the breaks when sitting idle in gear with foot on brake. It's on a 350 with phase II Bowtie heads, a mild cam, and Performer intake. Each TBI assembly is coated with a long lasting aluminum oxide finish. This is causing it to slam into gear. The Chevrolet TBI (throttle body injection) Performer manifolds are dual-plane, low-rise intake manifolds with a 180° firing order and a patented runner design that delivers outstanding performance with crisp throttle response. Diesel engine surging at low speeds. And they had zero issues with any of those engines running/idling poorly. I had to re-run new fuel lines and install a new sending unit. I has so far replaced distributor, cap, rotor, plugs, wires, cts, iac, o2 sensor, map sensor and tps. However, if throttle body is replaced AND a proper idle speed cannot be obtained, there is an adjustment which may be made. 0 diesel motor is no longer working due to a buildup in the gas tank, or oil system. but it runs great when accelerating or about 60mph and faster almost like nothing is wrong with it. Good low-RPM torque, great pulling, offroad, good highway mileage. 94 Chevy Truck surges at idle in gear, loss of power under accel? I just bought a 1994 K2500 w/ 5. it has a new aluminum radiator, new thermostat, new serp belt, new belt tensioner, new rad cap, and new hoses. While driving if you. GM Based TBI on an AMC 360 Waaayy back in 2002, I purchased a Howell-EFI fuel injection kit for my AMC 360 motor. If you are going to spend the money to update your ride to EFI, spend it on a system that can grow with you in the future. I has so far replaced distributor, cap, rotor, plugs, wires, cts, iac, o2 sensor, map sensor and tps. On TBI its just like a carb getting a build up while runningIf you use the carb/choke cleaner MAKE SURE IT'S. It's very intermittent so I haven't let it get to me too much, but today I had a flat out backfire. If the problem is still surging at low idle, the fix is going to be removing the carb, cleaning everything back upremove all the screws and stuff you can get to, blow it all out with carb cleaner and compressed air, it'll clean up, these carbs were noted for being hard to kill. Problem: With the engine running at idle, always when cold, intermittent when hot. 7) by changing the injectors and the use of an adapter that came on 1989/1990 1 ton trucks and using an Edelbrock Performer intake (modified to work with the 15 degree center bolt TBI heads) even setup the EGR and all (fooled it with an oraficed vac can). Compared to a carburetor, a bolt-on TBI system is like night and day. But hardly anyone references the butterfly on the TBI unit not being adjusted right. Wondering if anybody can help me out. This is causing it to slam into gear. Cleaning the throttle body allowed more air to enter the engine, and the computer is compensating by adding more fuel. With the 454 TBI on my 94, bottom even more lop sided and the top end pretty close. SOURCE: 90 chevy k1500 350 tbi fuel problem starts but wont stay running try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. 454 injectors are the worse for having poor low duty cycle issues causing poor fuel control at idle and light throttle. It has the L05 TBI 350 and MG5 manual transmission. When TBI engines are running right, they come up and idle for a little while, then go "closed loop", which means the ECM adjusts the fuel delivery in order to get the proper reading from the oxygen sensor. HOWELL 2 X 2 TBI FUEL INJECTION KITS: low enough idle speed. My 1990 GMC 1500 with an automatic 5. 30 oil is way too thin for an old style 350, I wouldnt. 350 TBI to 454 Carb engine and tranny swap. Probably the most common problem that causes idle problems in multiport fuel injected engines is a carboned-up throttle body. Ok guys, this isn't my first rodeo, and I'm truly stumped here. 0L) and 350 cid (5. I changed plugs and wires. GM TBI WIRING GM Truck Throttle Body Injection 4. You will find Ford F-350 EFI systems which will perfectly match your truck in our store. We've been having a problem with my son's 1988 Chevy K2500 4x4 w/ 350 for the past couple of weeks. The Chevrolet TBI (throttle body injection) Performer manifolds are dual-plane, low-rise intake manifolds with a 180° firing order and a patented runner design that delivers outstanding performance with crisp throttle response. In my 89 TBI 350 I can drive beautiful for 30 minutes, then after a few stop and goes, the idle drops and it almost stalls- then the idle goes high, drops low then stalls. Again, start the engine and compare how it is running at a stop to how it normally runs. The name first appeared 30 years ago in a limited-edition styling variation of an experimental Chevrolet show car. GM 86-95 OBD1 Guide (READ ME) Socket Booster – required for use of Ostrich 2. The only thing that came back so far is 22, throttle pos. Expect big mid to upper end power, will have a noticeable idle. GM Based TBI on an AMC 360 Waaayy back in 2002, I purchased a Howell-EFI fuel injection kit for my AMC 360 motor. 20 minutes roll by and it is still stuck at this high idle, I adjusted the idle mixture screws and even the screw that controls the carburetors idle speed when it is warm on the 1406 and it did absolutely. '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. The brakes don't affect the idle, but the truck is very jumpy while at a stop sign/light, I just assumed that was normal with its age and all that torque. Usually run my idle on 350 at 700 RPM and up. This is an ancient thread but I didn't want to start a new thread based on the same issue. ALDU1 – USB ALDL interface. Oh there is an AFR head that is designed for L31 Vortec 350 use that even has it emisions exemption they are 190cc. Timing is set to 0 with the ECU wire disconected and about 25 with the ECU connected (all at idle when in closed loop). 30 oil is way too thin for an old style 350, I wouldnt. Set the idle speed to 450 rpm, rotating the Torx screw clockwise to raise rpm, and counter-clockwise to lower rpm. Starts cold no prob, runs and idles fine until its warm and in park or nuetral. The thermostat was new with the rebuild. Compression test on 350 TBI Engine / Drive Train. On auto trans without stall speed sometimes the idle has to be 1000 or higher to keep engine running when put in gear. Another KEY factor is placed on driveability, emissions, and fuel economy. Fuel economy should be fairly decent for a nearly 400-cubic-inch engine, especially if you use an overdrive transmission to keep engine speed low. I'm geared at 4. 7 tbI I have replaced every sensor on motor had igniton timing redone. I have a very similar setup. problem is that i cant seem to get the truck to idle or run correctly. 1A Auto is your go-to for the highest quality replacement auto parts. It happens usually when I turn the wheel to the max and put a load on the engine (while maneuvering at idle speeds), or when coming to a sudden stop. If given lots of throttle underway will simply die, fuel filter replaced with no improvement. this jeep has overheated every single time i've driven it. crate engine and make 400 horsepower. here is the list! fuel pump/filter,tps,iac,temp sensor,map,pvc. i carry 40 psi at idle or park will stay that way for hours until i drive it. ~200k miles. '91 TBI 350 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. What does P0122 mean? This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). '94 350 TBI Start and Idle issue Discussion in ' and the rough shifting seems to have been because of low fluid. Long story short, I have 2 1995 Chevy pickups now, both with 350 TBI/auotmatics, bought the latest one a couple weeks ago. The short duration helps it. Chevy TBI high idle speed - why? I have checked all vacuum hoses, made sure the accellerate cable is free etc. The truck runs like a champ when coldthen will just die after it gets hotcould be at idle or going down the roadwon't start again until coolmaybe an hour. RPM Pre-Set: We want to Make Sure The Carburetor Curb idle is Pre-Set, Not to Low and Not to High, A Low Curb Idle Setting will Leave the Engine Running Rough Causing a Poor Running Engine, However a High Idle will Leave the Engine Racing Causing a Rich Running Condition. LMC Truck offers 4. Even though in stock form TBI setups were never used on a performance engine, it doesn't mean that they can't be used on a high performance engine. This started as a surging while driving at constant rpms. Chevy 350 Engine - GM Chevrolet 5. I am particularly happy with my roof bodywork. When I got it I Cleaned out the vst tank and got the rpm up to wot no problem. I bought a 1990 Chevy 1500 pickup several months back. Got a '94 Malibu ski boat with 5. manual says WOT rpm should be in the 4200-5000 range for my 350 tbi. You may have to register before you can post: click the register link above to proceed. Two fuel injectors mounted on top of the throttle body inject fuel into the motor. The throttle body unit itself flows 450 CFM in stock form, the intake runners on the intake manifold are smaller than the previous carb intake, and the intake port on the heads measure less. If I remember correctly the fuel pressure spec for the 350 TBI system is low, like 9-13 PSI with the engine running. Looking for help please, 1998 5. [SOLVED] 95 Chevy S-10 4. Low $ fix - compared to what you've got in it so far. You would have been batter off with a stock TBI and not bored for the low RPM response. We will see how this compares to what the "target idle speed" is set at in the chip. These TBI™/L31;s would have great off idle and low rpm torque. hi i have an 1987 355 tpi and i cant ajust the idle. This cam has good low to mid torque with a noticeable idle. If it idles fast, step on the throttle and slip your toe off the pedal to let it snap up quickly. adjusting minimum air should not be required unless someone played with the idle adjustment. it idles great but if i put it in any gear except neutral and park it will start shuddering badly. the car idles fine cold,but when it warms up it drops to 500 rpm than the computer makes it serge to 600-400 rmp than stalls. Cpsc: 2005 F-350. 7L 350 TBI (Rear 2WD) is stalling and/or having very rough "chugging" and power surges during very low rpms when I initially start accelerating, in reverse, or coming to a stop. Idle-5500 RPM Power! The Chevrolet TBI (throttle body injection) Performer manifolds are dual-plane, low-rise intake manifolds with a 180° firing order and a patented runner design that delivers outstanding performance with crisp throttle response. Surging idle can be caused by a number of different problems.