350 Tbi Low Idle

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. Idle is fine and has never. 5 now it s idle is so low it stalls. I've tried 6 and 14 degree throttle blades with similar results. There is a split in the intake with the 2 barrel TBI. For 1995-previous model year EFI-equipped GM vehicles. The truck has 190K miles on it and runs fine other than a misfire. When shifting into drive, engine runs at idle rpm, when throttle is pushed down to come off idle, engine coughs & dies. Whether you stick a turbocharged LSX engine between your frame rails, or put nitrous on your big block, the Terminator™ ECU can grow with you, unlike the competition where you are stuck with an entry level ECU. You will get excellent performance with EFI kits from such brands as Holley, Fast, Edelbrock etc. of torque when used with #3701 intake and stock iron cylinder heads on a 350 engine. Maybe a cracked/warped intake, Throttle Body, etc. 454 injectors are the worse for having poor low duty cycle issues causing poor fuel control at idle and light throttle. Had sat for 10 years but seller got it running and would idle and go up to 2500 rpm no problem. Anton Dyckyns 52,614 views. 0L TBI, MPI 1994 up thru 2005 Indmar and 2007 PCM. Works with stock gear and factory converter. I have a home made billet 4bbl tbi I'm testing. GM Based TBI on an AMC 360 Waaayy back in 2002, I purchased a Howell-EFI fuel injection kit for my AMC 360 motor. com FREE DELIVERY possible on eligible purchases. Now this new problem seems to be similar but 100 times worse at low rpm's , the thing barely runs, and backfires through TBI sometimes. When the air conditioning is turned on, the engine will stumble and stall at idle while in gear. It has the automatic 3-speed with overdrive. It comes from the factory with a protective metal cap over it. GM OBD-1 Diagnostic Trouble Codes. In most cases this is only done if you have modified the internals of your engine or you have swapped a larger throttle body onto your vehicle. 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. Just finished a 350 TBI / 700R4 / 3. Greetings all. The only thing that came back so far is 22, throttle pos. Warm Idle Speed = This is the Target Idle RPM for when the engine temperature reaches 170 degrees Fahrenheit. i have no idea what to do except map sensor. 465 HYDRAULIC - Fair idle with lope, strong low-mid range street and strip performance. The truck has full power while driving. The Toyota 22RE engines use a "Linear" throttle position sensor. 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. The idle is going to be high at first until the computer relearns the idle again. if you get a gauge designed for sequential fuel injection with high fuel pressure 50+, the graduations are not calibrated correctly for your low pressure TBI system and you could get skewed results. This was after it first happened. This particular '90 TBI 350 has the swirl-port heads and stock cam. I went back and added it: No there was no data logging done. lower end of engine completely rebuilt. The Howell TBI is a fuel injection conversion kit based on a TBI system found on GM 4. 6) Do complete tune up & diagnosis. I had one go on my 454ss TBI and the truck would start, idle + drive for short periods and then die. Lookup MerCruiser engine & stern drive by engine model and buy discount parts and accessories from our large online inventory. It idles rough for about 20-30 seconds (longer when colder) then smooths out to a normal nice smooth idle. 3 v6 TBI within the Automotive Support forums, part of the Tech Support Forum category. Re: chevy 350 TBI idle Aug 23 2018, 9:09pm plugs are fairly new. It has the L05 TBI 350 and MG5 manual transmission. It is a SBC350 with an AFI TBI adapter plate to a spreadbore manifold. he is a mechanic by trade and the motor itself seems to be pretty healthy with about 15k on it and a mild cam. Set the idle speed to 450 rpm, rotating the Torx screw clockwise to raise rpm, and counter-clockwise to lower rpm. This has TBI. Buy Elgin Industries Torque/RV Cam+Lifters Kit w/TBI w/valve springs compatible with Chevy GMC 5. Advanced Search Vortec stealth ram. New plugs,cap, rotor ICM,wires. Funny videos and YouTube music. chevy forum at Car Dealer it just goes back to low idle and stalling again, is the Surging 350 at. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. Repeat this process for all of the idle mixture screws. > in my 1990 Suburban 350 4X4 during an engine rebuild. The TBI system on the 350 is a high torque low speed design and all of the components work towards that goal at the expense of mid to upper RPM operation. Compression was 180 across all cyl's. in engine with manual transmissions. 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. Objective of this Article. i have read that it could be the fuel pump (small connecting hose. In the fall i did a bunch of stuff to my 350. Though this doesn’t happen all the times. Expect big mid to upper end power, will have a noticeable idle. While in p/n it surges up and down. there is a slight miss and lope so to speak at idle or low low rpms but as soon. How Set idle speed on Chevy TBI 350? [RPM]. It runs good, idles smooth and low and doesnt stumble anywhere. Under the hood it sounds like its sucking alot of air from the carb but I'm not sure. Adjust the idle speed screw located near the throttle control to set the low idle speed ( set the RPM so the warm engine will idle with out help , should be about 650 RPM) Turn off the key and stop the engine Replace the stepping motor connector and remove the jumper from the diagnostic connector. This can be done if the IAC learned. A helpful hint: All of the vacuum readings on the vacuum gauge should be the same for each screw you adjust. Then find the connector for the fuel pump relay in the right side kick panel near the computer and ground the tan wire. For non-fuel injected cars, most stalling issues can be traced to the carburetor or timing settings. 07-10-11 07:10 PM - Post# 2112746 Hello, I have an 1987 Chevy truck TBI which has an annoying stall. 0L) and 350 cid (5. I had one go on my 454ss TBI and the truck would start, idle + drive for short periods and then die. Is the TPS bad? How about the IAC? It appears that too much fuel is dumping into the throttle body during idle and it seems like it is flooding. Just finished a 350 TBI / 700R4 / 3. A worn camshaft can also cause bad running. A pressure drop of more than 1 psi under these conditions indicates an issue with the fuel delivery system. Objective of this Article. If it has good volume but the pressure is low, pinch off the return line to see if it will spike higher, if so the pressure regulator spring may be broke. 0_01/jre\ gtint :tL;tH=f %Jn! [email protected]@ Wrote%dof%d if($compAFM){ -ktkeyboardtype =zL" filesystem-list \renewcommand{\theequation}{\#} L;==_1 =JU* L9cHf lp. 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. i don't know what else to replace. If all other components of the fuel system are working properly and there is still a problem with the idle speed, the screw may be adjusted. When I got it I Cleaned out the vst tank and got the rpm up to wot no problem. 7 TBI, lopes at Idle, low power at takeoff, seems like it is starting out in second gear. This was after it first happened. Shop our parts catalog and find what you need to get your car back on the road!. 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. 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. Loading Unsubscribe from hisbutlerdidit? chevy tbi base idle adjustment - Duration: 6:37. It get's build up unlike a carb when the engine is shut off on MPI. 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 has TBI. 3) System too rich (Low Air/Fuel Ratio) - The idle speed will be too low. was created by Draedo Thinking about dropping it into my 90 k1500 with a 350+700r4. low signal at idle. Then when you depress the accelerator. I had one go on my 454ss TBI and the truck would start, idle + drive for short periods and then die. Found a 94 Suburban and used the 350 drive train and TBI. I was told it had a "cold. Usually a bad or failing idle control valve will produce a few symptoms that can alert the driver of a potential issue. GM turned out THOUSANDS of 4. Find Summit Racing® Classic Cam and Lifter Kits SUM-K1102 and get Free Shipping on Orders Over $99 at Summit Racing! From low-end torque to top-end horsepower--and everything in between--one of our Summit® Classic cam kits has you covered. Low idles could also be caused by vacuum leaks. I bought it from a wrecking yard. When I start it, (starts every time) it takes about 3 seconds from cold start to fire up. Now let’s add a typical EFI system—we’ll lump both the TBI-style systems and the multi-point systems together because from a generic standpoint, they operate the same way using the same sensors. I finally had time time to check the codes after clearing the old ones out. when the engine is cool, there is no knocking, but once it gets warmed up it starts aknockin'. 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. Comparable to popular Crane 227 cam and GM 845 cam. Get full 1995 Chevy Truck G 20 Van V8-350 5. Some times though the surge is not there and will run like brand new. adjusting minimum air should not be required unless someone played with the idle adjustment. The mechanic was saying in his experience when the computer goes it goes, when I told him basically my engine runs perfect above 1200 RPM its ony an idle problem. 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. 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. Rough idle but otherwise runs fantastic Voltage should cross between low to high. I had one go on my 454ss TBI and the truck would start, idle + drive for short periods and then die. Each TBI assembly is coated with a long lasting aluminum oxide finish. The 305 is cheap and plentiful. Idles great and runs great when warmed up. This started as a surging while driving at constant rpms. This is a discussion on [SOLVED] 95 Chevy S-10 4. TPS test and change, T25 Torex, K3500 Chevy 350 5. Find Summit Racing® Classic Cam and Lifter Kits SUM-K1102 and get Free Shipping on Orders Over $99 at Summit Racing! From low-end torque to top-end horsepower--and everything in between--one of our Summit® Classic cam kits has you covered. I checked compression on another 94 PS 190 with 350 TBI when I was shopping in 2013. 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. 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. 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. Though your cam specs are more than accetable for a MAF TPI, I don't have enough experience with cams and TBI to help. 7 tbI I have replaced every sensor on motor had igniton timing redone. the passage behind the right hand throttle body mounting bolt goes down to the end of the idle air control valve pintle. 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. Re: 87 Chevy 350 TBI low Idle issue I had the same problem you described many years ago with my 87 350 FI 4x4 and after two mechanics played with everything with no results, I took it over and left it at the GM tech school and they found that the distributor shaft had become demagnitized. and doesn't seem to have the power it used too. Looking for help please, 1998 5. Find Summit Racing® Classic Cam and Lifter Kits SUM-K1102 and get Free Shipping on Orders Over $99 at Summit Racing! From low-end torque to top-end horsepower--and everything in between--one of our Summit® Classic cam kits has you covered. chevy forum at Car Dealer Forums; I have an '86 GMC 1/2 ton pick-up that now has a 5. 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. I have a 91 chevy 350 TBI 252,000 miles, motor and trans were rebuilt at 204,000 back in 02. If given lots of throttle underway will simply die, fuel filter replaced with no improvement. Low idles could also be caused by vacuum leaks. The symptoms include stalling when coming to a stop, or very low idle after starting, or stalling if the throttle is "blipped" (opened and closed quickly). This Edelbrock cam kit produced 245 ft-lbs. This surging issue has been going on for quite awhile, but I recently had work done to it including a new exhaust (cat including) and was hoping the problem was related to the converter being plugged. Verified to work fine with the ScanTool. So far the idle problem has stopped and no other codes have appeared. With new thermostat it is about 165 F. We will see how this compares to what the “target idle speed” is set at in the chip. Unfortunately, these variables are all inter-related. Low $ fix - compared to what you've got in it so far. adjusting minimum air should not be required unless someone played with the idle adjustment. i don't know what else to replace. Idle air control valves open to allow more air to "leak" into the intake, raising the engine rpms, or close when not needed. In most cases this is only done if you have modified the internals of your engine or you have swapped a larger throttle body onto your vehicle. i'm going to have a look at a tbi injected 350 this weekend to swap into my CJ7. EFI systems usually include fuel injectors, the ECU, fuel rails, an air flow sensor, O2 sensor, and a harness. Though your cam specs are more than accetable for a MAF TPI, I don't have enough experience with cams and TBI to help. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. Looking for help please, 1998 5. i rebuilt the top end and have replaced my entire ignition system except the ignition coil. Plenty of power loss. 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. 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. 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. – 1700-6100 RPM Largest emissions friendly cam. Why does my 350 engine runs rough and smokesbluewhite smoke at idle and does not at high speeds. The idle speed is controlled by the engine computer. 7 tbI I have replaced every sensor on motor had igniton timing redone. 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. 10 It turns over and starts when it idles it idles really hi then super low as if it's going to die I try to feather the gas to keep it alive. When I crank it up on a cold day, it will start but idle just high enough to stay running (probably around 300 rpm) and will sometimes stall and give a poof of smoke out the top of the throttle body. Engine Idle Is Too Low Or Stalls Dirty Throttle Body. 1988 Dodge Ram TBI 318 - Runs Terrible!!! is looking for a desired idle of around 430 rpm, and it shows that it is running about that fast. I'm having trouble getting it to idle below 1000 rpm. HOWELL 2 X 2 TBI FUEL INJECTION KITS: low enough idle speed. A shorter spark line would indicate a weak spark possibly due to a lean fuel condition (dirty injectors or vacuum leaks) or low compression (burned exhaust valve or bad head gasket). Fuel mileage is low enough to count on. 30 oil is way too thin for an old style 350, I wouldnt. This page is dedicated to the owners of these vehicles equipped with GM's dual point fuel injection (model 220 TBI). Diesel engine surging at low speeds. Some times though the surge is not there and will run like brand new. It has the L05 TBI 350 and MG5 manual transmission. The symptoms include stalling when coming to a stop, or very low idle after starting, or stalling if the throttle is "blipped" (opened and closed quickly). 459 117 LSA) whatever year that was, in my 350 TPI 5200 lb K1500 and it PULLS. Because these L31/TBI™ trucks exist, that means that there will be PCM or ECM calibration files for the PCM and PROMs that are available. Dirt and water can. This is causing it to slam into gear. Bolt-On TBI. While driving if you. When I start it, (starts every time) it takes about 3 seconds from cold start to fire up. had a 94 305 TBI which on the odd occasion would start running rough, did the same cap rotor swap still ran rough, checked codes, reset timing, finally by fluke I noticed one of the vaccum hoses came off of the egr valve (Not sure if its a valve as it was a plastic box on the passenger side of manifold next to TB), plugged it back in nice idle, same condition would happen every month or so I. But before it does it goes through one last restriction- the Idle Channel Restriction. This is a discussion on [SOLVED] 95 Chevy S-10 4. vn/public_html/tyup08h/nm1. 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. 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. Idle is fine and has never. When I crank it up on a cold day, it will start but idle just high enough to stay running (probably around 300 rpm) and will sometimes stall and give a poof of smoke out the top of the throttle body. Recently bought a K5 Blazer from 1988 with a 350 TBI engine. Converted a Merc 305 2bl to MPFI. 459 117 LSA) whatever year that was, in my 350 TPI 5200 lb K1500 and it PULLS. It is unique and the finish works with the colour. when the engine is cool, there is no knocking, but once it gets warmed up it starts aknockin'. When I crank it up on a cold day, it will start but idle just high enough to stay running (probably around 300 rpm) and will sometimes stall and give a poof of smoke out the top of the throttle body. 7 350 EFI last fall. Low $ fix - compared to what you've got in it so far. Re: 87 Chevy 350 TBI low Idle issue I had the same problem you described many years ago with my 87 350 FI 4x4 and after two mechanics played with everything with no results, I took it over and left it at the GM tech school and they found that the distributor shaft had become demagnitized. High swirl intake and combustion chamber, good for high torque low HP low RPM applications (4x4 and towing). It idles rough for about 20-30 seconds (longer when colder) then smooths out to a normal nice smooth idle. I will get a better pic tomorrow, weird lighting. For whatever reason you have determined that you need to adjust your base idle on your GM TBI vehicle. And they had zero issues with any of those engines running/idling poorly. Exceptions to this were the TBI truck engines, which retained a flat tappet cam. ATK HP89 Chevy 350 Base Engine 375HP. Have changed the thermostat as I discovered with the ScanTool that the engine operating temperature was to low (140 F). 7L 350: Cam & Lifter Kits - Amazon. Some suggested the timing was set too high. basically the entire ignition system short of the distributor are fresh. However, still dealing with higher shift points. Dragged the CJ-7 up to Northern California and ran the Rubicon last week. Then find the connector for the fuel pump relay in the right side kick panel near the computer and ground the tan wire. Through succeeding years, the Corvette evolved from showcase car to a performance machine that typified the American lifestyle – fast, young and sexy. GM uses most of the same sensors on a throttle body as they do a tuned port engine. The idle circuits in a GL1000 are ridiculously small, so slight problems are greatly magnified. Pay your mechanic about $300+ to fix it for you or do it yourself and do a better job for about $100. This particular '90 TBI 350 has the swirl-port heads and stock cam. 9volts when driven extreme lean or extreme rich. I will get a better pic tomorrow, weird lighting. BASIC RPM 2000-4800 Street CD214-11C 975848 C37-16 99277-16 C817C-16 214 224 280 290 112. Re: chevy 350 TBI idle Aug 23 2018, 9:09pm plugs are fairly new. com is a division of Guaranteed Carburetors of Largo, Florida. 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. It seems if the butterfly is closed and not open enough to begin with, the ecm will never find the correct idle. For multipoint injected engines, the fuel pressure at idle better be much lower than pressure at wide-open throttle. stuff a shop rag into that cavity to block any air flow. i'm going to have a look at a tbi injected 350 this weekend to swap into my CJ7. 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. If the cap is still there, use a small punch to knock it out. I have a 1990 K1500 5. '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. An additional note, that cam in my TBI 406 in my 91gmc would run 13. 350 TBI to 454 Carb engine and tranny swap. 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. When in Park or Neutral, it runs great. Some of the components shown above may look different from what will be included with your kit. Well at least that was good info. They have like a sleeve that takes the place of that can. Verified to work fine with the ScanTool. That was with a different compression gauge. Then when you depress the accelerator. I use the TBI set up for staying at low rpm and low end torque, I got a heavy vehicle that sees a lot of idle time and probably never above 4000 RPM. Genuine Mercruiser 350 Mag Efi Mpi V8 Engine Crankcase Oil Drain Pump 802889q1 Genuine Mercruiser. 2V)around a minute with the ecm is closed loop. 3:1 or less Check Valve to piston clearance. LMC Truck offers 4. Throttle Position Sensor/Switch A Circuit Low Input. hey guys, i recently aquired a 91 chevy C2500 with a new rebuilt 350 tbi. Our online campaigns, grassroots organizing, and mass public actions are led from the bottom up by thousands of volunteer organizers in over 188 countries. While driving if you. When I got it I Cleaned out the vst tank and got the rpm up to wot no problem. 10 It turns over and starts when it idles it idles really hi then super low as if it's going to die I try to feather the gas to keep it alive. 350 tbi idling high? Discussion in ' Hey guys, lately my truck will randomly kick up the idle in park to around 1200 rpms. by Abdul-Wahab April 25, 2019 Abdul-Wahab April 25, 2019. 6) Do complete tune up & diagnosis. Again, start the engine and compare how it is running at a stop to how it normally runs. The engine is a 1995 TBI v8 that i got out of a 1995 GMC 3500 Van. Because these L31/TBI™ trucks exist, that means that there will be PCM or ECM calibration files for the PCM and PROMs that are available. 1990 cheyenne 2500 5. TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Engine / Drive Train: Compression test on 350 TBI. 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. TBI (speed density-based) systems require a cam for fuel-injected applications with a low-rpm operating range, strong vacuum, and a good quality idle. Running with stock programming with a low idle speed setting combined with the fact the chip is designed for 20-21″ of vacuum at that idle rpm with a cam upgrade which typically drops the vacuum to 18″ or less will cause the motor to run too rich which will spawn a high idle speed where the motor will then lean out and rpm drops and repeat. When I crank it up on a cold day, it will start but idle just high enough to stay running (probably around 300 rpm) and will sometimes stall and give a poof of smoke out the top of the throttle body. Then find the connector for the fuel pump relay in the right side kick panel near the computer and ground the tan wire. i like to set it as low as possible with engine still running smoothly. when i looked it over it looked to have been rebuilt. If the idle is low and inconsistent, it may be due to an issue with your idle control valve. Objective of this Article. this jeep has overheated every single time i've driven it. It is a 91 chevy truck with the 350 (5. ProDarwin wrote: Has anyone looked at a dyno of a 5. You will get excellent performance with EFI kits from such brands as Holley, Fast, Edelbrock etc. It does idle low in reverse though. If it has good volume but the pressure is low, pinch off the return line to see if it will spike higher, if so the pressure regulator spring may be broke. Once I come to a stop and sit for too long the idle gets real low. hey guys, i recently aquired a 91 chevy C2500 with a new rebuilt 350 tbi. 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. In the fall i did a bunch of stuff to my 350. 350 MAG EFI 1996-1997 0F800500 0K001509 TBI MEFI 1 & 2 4 350 MAG MPI 1995‑1998 0F415189 0L339999 MPI MEFI 1 & 2 4 350 MAG MPI 1999-2001 0L340000 0M299999 MPI MEFI 3 4-5 350 MAG MPI MCM 2001-current 0M300000 Current MPI ECM 555 6 350 MAG MPI MIE 2001-current 0M310000 Current MPI ECM 555 7 Black Scorpion 350 MAG. The “minimum idle speed” must be less than the “target idle speed”, otherwise, during normal operation, the IAC pintle could bottom out on the air passage seat of the TBI, and damage will occur to the stepper motor of the IAC control. 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. 4-bbl Spread Bore Flange / Idle-6,000 RPM Range Chevy SBC 350 1957-95 (Non Egr) Low Rise Dual. 7 EFI engine. Greetings all. When I start it, (starts every time) it takes about 3 seconds from cold start to fire up. I have a '97 196 with a chevy 350 5. 2) System too lean (High Air/Fuel Ratio) - The idle speed may be too high or too low. Well at least that was good info. Late model and import high amp alternators are custom made to give you unsurpassed performance and durability. need advice low oil pressure 350 tbi. most likely you have a vac leak or dirty iac. Removing Idle Stop Cap from a GM TBI and Adjusting the Idle Set Screw. TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Engine / Drive Train: Compression test on 350 TBI. chevy forum at Car Dealer it just goes back to low idle and stalling again, is the Surging 350 at. if its a 350 tbi then. there is a new cap and rotor on the dis as well. It has a great running LT-1 Fuel Injected V-8 Engine backed up with an automatic Over-Drive Transmission. The idle speed is controlled by the engine computer. Here are two TBI injectors. I'm back with more problems my 350 tbi will not idle without making a loping noise. The 305 is cheap and plentiful. Lookup MerCruiser engine & stern drive by engine model and buy discount parts and accessories from our large online inventory. 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. I am talking idle to 4000 rpm. We throw a Hydraulic Roller Cam Package in our GM Performance Parts 350 H. This cam is computer compatible. This isn't in my MG, but, you guys have such vast knowledge and am truly stumped. Greetings all. To re-iterate here is my problem: Engine wont run at idle, you need to bump up the throttle to start it and keep it running. I haven't been able to justify doing any upgrades over the usual Ultimate TBI stuff and headers into a single 3". It's very intermittent so I haven't let it get to me too much, but today I had a flat out backfire. GM OBD-1 Diagnostic Trouble Codes. 350 small block knock at idle rpms i have a chevy 350 small block that knocks at idling rpms. It seems if the butterfly is closed and not open enough to begin with, the ecm will never find the correct idle. changed temp sensor, ERG, cleaned and rebuilt the TBI, replaced all vac lines, fuel filter, added sea foamand a few others. Running with stock programming with a low idle speed setting combined with the fact the chip is designed for 20-21″ of vacuum at that idle rpm with a cam upgrade which typically drops the vacuum to 18″ or less will cause the motor to run too rich which will spawn a high idle speed where the motor will then lean out and rpm drops and repeat. 350 small block knock at idle rpms i have a chevy 350 small block that knocks at idling rpms. basically the entire ignition system short of the distributor are fresh. Find Summit Racing® Classic Cam and Lifter Kits SUM-K1102 and get Free Shipping on Orders Over $99 at Summit Racing! From low-end torque to top-end horsepower--and everything in between--one of our Summit® Classic cam kits has you covered. Ive got a 1992 GMC Yukon 2-dr 4WD, 350 TBI. I had to re-run new fuel lines and install a new sending unit. Chevy SBC 350 5. Rough idle but otherwise runs fantastic Voltage should cross between low to high. I would like to ask some of you to take an educated guess at this problem(s). This page is dedicated to the owners of these vehicles equipped with GM's dual point fuel injection (model 220 TBI). 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. Removing Idle Stop Cap from a GM TBI and Adjusting the Idle Set Screw. I set the idle speed with it on at 2500 rpm on gasoline. Our OEM Throttle Body Injection (TBI) Assemblies are complete and ready to install. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. '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. 3 v6 TBI within the Automotive Support forums, part of the Tech Support Forum category.