Tbi wont idle down. Also while driving down the road it'll cut in and out for a few seconds. I restarted the engine and drove it, but it would stall when I would come to a stop. Start cold and let it warm up. Hello, I am having some issues with my idle. 2L V8 318 TBI Idle Problems. Could even be the base plate carb gasket. '91 S10 4. If the IAC is working properly, the idle will come down on it's own after several minutes of high idle. I replaced the fuel pump-because it was bad in July. #1 · Apr 9, 2010. New member. turn ignition switch off for ten seconds 3 . That's exactly what it was. - All rubber fuel lines. Cap Sep 27, 2022 · 95 Chevy 350 w/tbi backfiring through tbi. #7 · Jun 29, 2014. Jan 12, 2014 · Vacuum leaks are killer for TBI to run right. I have read nearly every thread on tbi surging idle, code 44's (lean o2), and everything in between. Fire up the engine and using the idle adjustment screw somewhere on the throttle body, adjust the idle to where you want it. Otherwise everything is fine. Hello all sorry if this is the the right section. 57 Oval Window VW. The system is designed to run with 12-13 psi. Found the body to motor ground strap broke, and ground on back of passenger side Oct 2, 2010 · Backfire, missing, rough idle 2. It seems that once the temp gets up to about the middle of the gauge the idle suddenly revs to about 3k and won't drop. This issue is consistent whether the engine is cold or hot. Goldie, silverado002 and Lerch98. 3L TBI 180,000 miles. Step 1: Turn the key to the ON position but do not start. Ect sensor. Like. xJCross Discussion starter. Jan 31, 2017 · If the idle comes down then for some set of reasons the IAC isn't functioning which can be a failure of the computer to signal or for that signal to get through the wire harness to the IAC. Oct 3, 2023 · Engine Size. high idle. 9. I assume the IAC valve works because when its cranked up it idles up for a second then idles back down, But Jun 21, 2015 · 1) Start the engine and let it idle in park for 3 minutes. www. Base timing is also correct. Surging Idle needle moved up and down with RPM. I adjusted the "base idle screw" and it runs a lot better. Last GM 350s, Vortec 5. Aug 25, 2010. The issues I'm having is most defiantly effected by the weat Sep 15, 2016 · 1989 Dodge Power Ram W100 5. Also stumbles and occasionally will stall when first started in the morning. After installing the rebuilt engine, I started immediately having Mar 12, 2014 · 92 TBI low idle in gear at stops. Aloysius said: The IAC (Idle air controller) won't cause that problem. I bought a new one and installed and its not working. This is caused by the throttle plate not seating properly. Background; Grandson drove truck 75 miles to my place backfiring and barely running. If the idle does not come down with the finger test then May 7, 1994 · Dec 27, 2012. 1 2. Shut off the engine, ensure power to the Sniper is switched off. I am thinking of 'scoping the idle speed motor wires, but I don't know what to expect. At idle to 1/4 throttle, the engine runs smooth. 7L TBI intermittently stumbles/stalls at idle, and frequently falls flat on acceleration down the road. There is a variety of strange things going on with this truck, so I thought I would give this forum a try. Jun 10, 2020 · Here's a . Jun 21, 2021 · If you don't have a OBD2 set air screw to 4 turns out then adjust idle screw to OEM spec if you have a gauge or by ear. . This can be the passage is damaged or is carboned such that it keeps the IAC pintle from seating. During cold operation it takes a very long time for enough fumes to reach the chambers to start combustion. Car was perfect until the distributor pick up coil failed and I replaced it, along with the whole distributor. 7 GSi. 2) After 3 minutes, turn the engine off and leave it off for 60- seconds. At 10 it may not even run. Aug 10, 2009 · 6 Answers. So, today we took a pressure gauge and checked the fuel pump. Feb 20, 2013 · MSD Tech: Atomic TBI Idle Adjustment. Bike was awesome but have a couple of questions. I thought I might have had a vacuum leak somewhere so I inspected all of my vacuum hoses and Feb 12, 2020 · 1988 2. I noticed a weird idle but didn't think too much of it. Slow to get down to idle could possibly be a failing or dirty IAC (idle air control) motor. My 89 S10 4. When I start my truck it is automatically at 3000 rpms and I think it got worse after driving it to work so it is now parked until I can diagnose the issue and fix it. Consider this case closed. The truck will start and run and will idle but it sounds like it's a hot rod because of the way it lopes. 88 Dodge Ramcharger. turn ignition switch to on for 10 seconds , do not start 2. I swapped the CCPS and Ambient air pressure sensors and voila! Did the idle screw mod at the same time. Feb 10, 2009 · 350 tbi idle I bought my jeep with the 350 already in it, ok with that said my IAC is bad i tested it and when i cover the hole my idle come back to where it needs to be. I've been fighting it for a year now. My 350 TBI in my truck is becoming undriveable with a really bad bog and hesitation/stumble when I try and take off at any rpm or speed. item 3 - welch plug on Throttle body- remove plug with small drill bit and screw, adjust idle screw behind it to about 500 rpm with IAC closed. Bike runs much better now. Extra air getting in the engine will speed up the idle. 2) Tight pedal and having to use the extension. Jan 14, 2010 · Jan 21, 2010. try unplugging the brake booster vacumm line and cap the line to see if this helps. Messages. I got the truck last week, they said they just swapped the motor, but had said issues. TBI is run by wire so be careful to leave plugged in while cleaning or gate will close. Before this issue, it has always idled at 1500 rpm on startup and takes awhile to idle down. The system is incredibly sensitive to low fuel pressure! Even running at 11 psi is very noticeably sluggish. You must perform a IAC relearn after removing. If vehicle is started with starting fluid it will stumble to life slowly, then idle fine, will run Feb 27, 2008 · 1) wont idle, kind of lopes a little bit (not cause of a cam) stumbles n dies 2) When trying to give it fuel its like it drowns out, but as soon as u let off the throttle from trying to rev it and it stumbles, it revs up some, then dies down n trys to die. Sometimes it will idle smooth, sometimes it drops to 6-700rpm then dies, if it runs smooth and I put it into gear, it dies immediately. Dec 22, 2017 · 1988 Chevy S10 4. Only happens under load. 3) Need to add carb spacer, make the stock air cleaner sit 2” too high, and just did not look right. The motor is out of an 88 1 ton pickup and is in a 89 1/2 ton suburban. So I have a 95 TBI 350 with about 190K miles on it. #1 · Sep 30, 2023. 1986 S10 Regular cab w/2. If your IAC is stuck in the closed position then that would explain why it won't idle when the throttle plate is closed. Feb 20, 2011. New Jersey. ) I had a "service engine soon" light on so I limped to the auto parts store and the disgnostics said "O2 sensor". Engine runs rough, idles down to 500 RPM or dies at a stop light. 300,000 MILES. is 26-32 PSI on '94 & 95 7. Jul 31, 2010 · Vac test. Oct 15, 2023 · Posted October 15, 2023. Apr 28, 2020 · 95 1500 5. Hey guys. 7 TBI developed a new issue after fixing some others. 8L -220 TBI - 4 speed manual transmission - 230K Original Miles and STILL going! 1997 S10 Xtend cab w/4. bad (10-12MPG)I have replaced the following: Jun 25, 2013 · So I replaced the intake gaskets. TBI is surging with steady part throttle in open loop when cold. Starts like a great. By adding a real idle screw your TPI now acts similar to a carb when addressing the low circuits. Jan 3, 2009 · Vacuum leak or defective Idle speed control motor. I have pinned out the PCM grounds and checked circuit resistances (all good), All scan tool parameters are within proper Nov 11, 2001 · high idle with a 350 TBI. Even sometimes at 1000 rpms the tac and engine jump around and this idling issue just started happening once i put the new fuel pressure reg in it. 5l 4cyl Tbi. Apr 4, 2011 · 1993 Chevy K1500 5. During that period the idle may be higher idle than normal. Feb 16, 2011 · The truck does not like to idle with a thermostat in. Changed O2 sensor - no help. At the same time, I replaced the tbi to manifold gasket since there was a slight leak (car ran ok, though). I missed that era of Aug 11, 2008 · 1 . One stoplight its idling perfect at 850 and while going to the next stoplight. ) It normally starts at about 1100 cold and then the IAC lowers it as it warms. When the air conditioning is turned on, the engine will stumble and stall at idle while in gear. It's my first GMC ever . It would stall while sitting at idle in park or when in gear at a stop sign. The engine seemed to run fine while driving. CP8071. May 7, 2013 · 1994 454 tbi has spark and fuel but wont start. When the engine is idling, pull that vacuum line at the front pass side front intake port and your idle should rise, not lower. A couple years ago, I rebuilt the engine and kept everything bone stock. Use the idle speed screw to set the idle at a comfortable warmup speed. 7. The First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush. These caps are notorious for internal problems. 454 TBI. This started as a surging while driving at constant rpms. It has a four-wire plug and is cylindrical. 7/4L60. 7L TBI. I got the ODB and it’s really erratic. But I've been just uses sing and I need a way to solidly diagnose what's going on with it. When started cold the engine should start without pushing down on the gas pedal. Appeared to be water in the old fuel filter did not see any in the new filter or in a sample pumped from the tank. I know I've read about other people on the forum having this problem with their TBI engines too. Replaced the gasket and put in a new IAC last week. After 30 seconds unplug the IAC valve. And with that the Fuel Filter. I've got a Jeep 4. It's pretty much always there, I can get it to behave a bit once I'm moving but that's really only between 20 and 40 mph and that's by hitting the sweet spots. - Oil and filter 10W30. 1994 s10 ext cab 4. It also sounded kind of boggy right off idle. It is a vacuum leak. I got my van out on the road yesterday after double checking the timing (which i thought to be causing this problem), and the problem still occurs. Smooth idle was around 18-19. GM TBI fuel pressure spec. Runs great and has under 100k kilometres on it, but at idle it bogs down to a near stall before returning to normal idle speed. Re: Engine wont idle/ Runs rough Volvo 5. It would start and idle fine for a few minutes then the engine would die. Especially when it's been driven - shut down for an hour - and restarted. You'll hear the IAC screw resetting. Occasionally when starting the RPMs race up and down. Go to ALDL plug close to hood release, jump ports A and B, turn key to "on" (not crank) Wait maybe 10 seconds for IAC plunger to full extend. if no leaks are visible between the fuel tank and the throttle body, the problem is most likely a ruptured fuel supply hose at the fuel pump module. I have a 2019 Honda rancher 420, when I start it, it will idle completely normally, but once I give it any bit of throttle, then let go of the throttle, it starts idling high and fluctuates rpms when idling quite a bit. When it's sat for a while and I start the engine, it idles at about 1200rpm for the first couple of minutes, then drops down to about 900rpm, and a little while after that drops down to 6-700rpm where it idles at when warm. 3L is having issues idling and poor throttle response from idle. I have a 90 chevy k1500 350 tbi with same problem! I have traced problem to after turning on key fuel pump kicks on when u crank it over injectors shoot gas and truck starts! After few seconds injectors stop spraying and truck dies! This can happen many times over and over! Eventually sometimes truck stays running and all is great! Jun 29, 2010 · Starts at standard high idle but quickly settles to about 1k (I have no tach, so going on sound and feel). Very noticeable in second gear at about 25 mph. lost power going home one day, very rough idle, dies when placed under load if you are lucky enough to get it to run long enough. 1987 Chevy Cavalier 2. Shut down the engine and clear the codes in the Feb 20, 2013 · MSD Tech: Atomic TBI Idle Adjustment. Plug the vacuum lines with golf tees or other suitable item. If the fuel pressure drops rapidly (to below 10 psi in one minute or less) a leak is present in the fuel supply system. Step 3: Release the accelerator pedal ALL THE WAY and count for 35 seconds. After about 10 cycles it dies out, what I am assuming is the Idle control motor clicks 3 times and then all you hear is the radio and the heater lol. When i reach 1/4 to about 1/2, 3/4 throttle it chugs bad, acts like it's missing/got Feb 20, 2014 · Re: 454 tbi won't idle when warmed up Have you done the easy stuff like check for vacuum leaks? 8 out of 9 TBI idle and driveability complaints can be traced back to a vacuum leak. I have a 1992 Chevrolet K2500 350 tbi that idles high about 1200 to 1500 rpm sometime's will idle about 800 rpm. Hello, working on my 2000 Rinker with a 5. May 7, 1987 · It won't idle. pdf that shows how to set your base idle, IAC, and your TPS voltages. You will have to hold the throttle open just enough to keep the truck running while you do this. Mar 11, 2012 · TBI 454 surging idle. Fuel filter and rebuilt the TBI. When its running sometime look down the throats and you'll see it squirting wet fuel on the throttles. It ran ok, but was in need of a tune-up. Now won't start. Sep 22, 2022 · Switch power to the Sniper on and crank the engine. It is a 1987 Chev Silverado with the 5. Ran better, but still stalled. Aug 19, 2020 · SOLVED: 1993 c1500 5. sudden,it trys to idle down to about 500RPM. 7 TBI. make sure the throttle is against the stop where it hits the set screw for the idle,but dont try to adjust it,its at a factory setting. Ray Frescas. Sent from AutoGuide. 7 TBI (3 year old Jasper engine - 20k miles). Aug 6, 2020 · So far they have checked for vacuum leaks, replaced the MAP sensor, fuel pump, ignition coil, cap, rotor, wires, throttle body (new iac and TPS included), injectors were also replaced. I have replaced the engine temp sensor, the connections to the coil, the Oct 15, 2010 · I drive a 94 S10 pickup with a 4. Check all the vacuum hoses. During these run periods you may see a check engine light. The next day I went to start it and it started right up but idled at about 600 rpm completely cold. I replaced the plugs, wires, cap, rotor, and air filter. Feb 24, 2008 · Connect a vacumm gauge to the pass side intake port that feeds the Black Ball and your heat/ac controls. The engine turns the A/C compressor fine at higher RPM. Now it's idling rough and stumbles a bit. 7/23/18 9:06 a. Fuel was removed and replaced to start with all filters and seperators replcaced and lines flushed Apr 5, 2020 · Using your induction timing light, hook the pickup to #1 spark plug lead, and run the engine at an idle while shining the timing light at the TBI unit's throat. Jan 31, 2009 · Low fuel pressure is a very common cause of many issues in a TBI system described as a bog, gutless, no balls, etc. My son got to ride his new 2024 TE300 yesterday for the first time. It has a 2. Apr 9, 2010 · 153 posts · Joined 2010. check engine light-also,the fuel milage is. Typical TBI motor will idle with 20-21 inches of vacuum stock. hottottyscreations. Jun 24, 2019 · After trying several other fixes I finally diagnosed and repaired the problem part. Pretty much any of the cams I recommend or have listed on the website will pull at least 17-18″ of vacuum at idle. Don't drive it until it's plenty warm. I've never owned or worked on a TBI Chevy before. Truck had been overheated several months prior and I assume it was HOT. I did replace the plug wires, cap rotor and coil, they all needed replacing pretty bad. Any time there is a high idle on a TBI or other fuel injection setup, there is too much air getting into the motor. Any ideas on what's wrong? (It's got an SM-465 in it if that helps) movietvet. tbi wont idle « on: July 23, 2011, 05:42:45 PM » I have just done a tbi conversion to my 84 Scottsdale with an sm465. Feb 20, 2011 · Feb 19, 2011. May 5, 2004 · C. With the IAC passage completely plugged the engine should barely be able to idle, fully warmed up with all accessories off. If it helps, think about it as a computer-controlled vacuum leak. It will bog itself down and eventually cut out loping high idle, extremely low idle (low enough for oil pressure light to kick on occasionally. At slow speeds and under load the oil pressure drops to 5ish and stalls out. - New MAP sensor and IAC sensor. Sputter/bog on acceleration, smooths out backing foot off the gas and at higher RPM. Picked up a 1988 K3500 last year with what I believe to be a TBI 350. I changed the cap and rotor. com. Jun 30, 2011 · 95 5. 2 with the Howell EFI kit which is based off a 4. You might try removing it and see if the tip is dirty, clean just the tip of it with a brush and some carb cleaner, but be very Oct 15, 2010 · I drive a 94 S10 pickup with a 4. (I put in a new set of spark plugs 9 months ago as routine maintenance. Seems to sputter bog more on longer test drives. Here's a list of what I've done so far. it fired right up just like i expected it would, it idled just fine for about 5 mins then i noticed it started running really rough and sounded like it was sucking a lot of Nov 7, 2009 · The interesting thing is it will idle rough and then for no reason it will smooth right out and run like a champ then a couple of seconds its back to the rough idle. 02/20/2013. IAC valve is a regulated vacuum leak, controlled by the ECM. #13. 5-inch handheld (only), wait for the temperature to achieve 160°F. that keeps the engine from quitting when idling down,and IAC doesn't have to travel Observing the temperature on the 3. Step 1. I would go to push in on the clutch and the car will actually idle higher like 1500+ until I come to a complete stop and then it will either go to about 1100 or it will idle at 500 almost dying. 474 posts · Joined 2002. start engine and verify proper engine speed ( should be about 450-475 for automatic trans slightly higher for manual ) i hope this helps you . 3. Aug 6, 2015 · Hey guys, I'm hoping you can help me out with this 1988 Silverado. Jul 15, 2005 · Recently rebuilt the 454 in my 1990 TBI Burb. Feb 5, 2011 · 93 Chevy 350tbi runs but won't idle. 10 min read Atomic EFI. Apr 14, 2024 · 1. BTW, there isn't a MAF on the TBI engine, it runs strictly on speed density (MAP/RPM). I have a 1988 S10 Blazer 2. Jun 12, 2011 · My truck is an 87 R10 with the 305 TBI. Canada. 7 liter TBI engine, HEI ignition with detached coil. 5) Random car runs bad and spending hours looking for a wire or vacuum line leak. It goes away after I drive it for a minute or it warms up to closed loop. Some GM 6/8 cylinder engines used a distributor cap with the wires coming out the sides, not the top. Still ran rough. Idles great and runs great when warmed up. 1) Tick tick tick tick tick at idle, know what I’m talking about. Another common cause would be the Idle Air Control motor. 3) Start the engine again and let it idle in park for 3 minutes one more time. Update: Cleaned out the throttle body, it wasn't too bad inside. It just dies every time you do anything but run down the road. 7 Flooding on Startup. Still had idling issues. 3 system. When you get to the map port just move map to a different port on the throttle body. 2. Jul 9, 2014 · 89 S10 4. . First of all it wouldn't start without cracking the throttle open and it didn't want to idle (cold or hot). My 92 wagon 5. This vacuum leak can be at the IAC valve. The engine continues to idle high at lights and eventually overheats if I don't turn it off. The throttle body gasket had broken and was letting in too much air caus 1990 GMC C1500. #2 · May 5, 2004. 7 posts · Joined 2013. 8 TBI, automatic, 2WD with 122K miles. The wiring, and screen with the pump, in the tank. Two things to check. Since it's a conversion the return line could be restricted, this raises pressure. 4 big blocks. The IAC is threaded into the throttle body injection unit itself. It will idle then at around 950 to 1100 rpm but is so rich youll tear up if you're within 30ft. 3 TBI (vin Z). Dec 20, 2019 · 8. Effin A. they use low pressure and they are more like squirt nozzles from a spray bottle. When I hit the throttle, there is hesitation, but then it picks up. 3 tbi 5 spd 7/9 drop, window tint, system (building new one now), tonneau cover, you know the usuals. Also check CTS sensor, when they go bad it reads -40c and adds fuel like crazy. 8L. May 11, 2011 · This can cause all sorts of idle and hesitation problems. 7 TBI Mercruiser I bought last year. - Replaced the TBI base gasket. 3L (X) Vortec -Automatic - 160K Miles (NEW 5/2011 - $ 750 bucks!) Aug 6, 2020 · So far they have checked for vacuum leaks, replaced the MAP sensor, fuel pump, ignition coil, cap, rotor, wires, throttle body (new iac and TPS included), injectors were also replaced. I have a 1993 Chevrolet C1500 with a TBI 5. Me and my dad had just gotten done rebuilding my Chevy 350. The motor seems very weak to me vs what it should be. Jan 6, 2010 · Performance would bottom out randomly and act like that. I have one continuing problem that I have been unable to solve. I did have to patch the old lines into the new lines at the pump. Item 2 - distributor reluctor- remove cap, see if reluctor really rusty and flaking, if so replace. The known issue is that the exhaust manifold gasket leaks horrendously, which melts the front left plug wire. They looked p … read more Nov 21, 2006 · The TBI's injectors aren't really injectors at all. Back fire through TBI. I had problems with random (searching) idle speed and stalling when clutching after being at speed (like slowing down on an off-ramp). 0L auto. CTS was not grounded and apparently fuel-washed the cylindersseveral shots of oil in cylinders brought The IAC (idle air controller) allows some air to bypass the throttle plates in a TBI system. 8 TBI Starting and Idle Problems. This fixed the issue I had. 7, 2wd. These are attached to the bottom of the air cleaner. Runs great if you hold the throttle a touch or are accelerating. I just bought a 2020 TE250i and the idle was low. If it doesn't come down, it may be suspect. I haven't started replacing anything that Nov 20, 2015 · Turned key to Acc, pinned down gas pedal to hold gate open, took off & cleaned with $5 tb cleaner & fixed. Plus as @RawbDidIt suggested, check your fuel pressure, s/b 11 - 13 preferably closer to 13. 7L. Once above 160 degrees, turn the idle speed screw so that the idle is about 50 RPM below your target idle speed set in step 1, above. I have a 95 suburban 454 that won't idle unless map line is pulled off and plugged. If it is stuck open, it is a larger than necessary vacuum leak. 350, 502. - 2 1/2 X 10 air filter. I chased my tail for weeks - replaced the filter and it disappeared. Aug 24, 2010 · 11. idles way too fast (1200-1500)then all of a. 5-inch handheld (only), wait for the temperature to achieve 160 degrees F. Jun 20, 2006 · Jun 19, 2006. Friends, I am desperate, I tried everything I know and more but I cannot find a solution to my Loping idle and surging acceleration on my '90 Sierra C1500, 5. 7 tbi dies when put in gear. 4. I don't think that applies to an 89 TBI. 14. 10 min read Share MSD Tech: Atomic TBI Idle Adjustment. #1. I am having a terrible time with getting it to idle smooth. Carb and vacuum leaks are the main cause of this issue most of the time. Jun 20, 2020 · Jun 20, 2020. The injector relies on TDC for #1 cylinder as a signal. Reaction score. If you force open or close gate (even unplugged) you might have to recalibrate by starting, running, shouting off & repeating (or driving about 50 Dec 3, 2021 · On 12/3/2021 at 7:44 AM, SlowDinoDog said: Crankcase pressure sensor CCPS may be leaking or contaminated most common issue with these. First, replace your coolant temp sensor. I've changed the MAP sensor. I replaced IAC, CTS, TPS, ETS, EGR valve, EGR solenoid, FPR, Injectors, fuel filter Jun 15, 2004 · 1. The engine has a little over 500 miles on it. I've got a 1987 Chevy v10 350 tbi with 700r4 that when I turn on the a/c (that has all just been replaced and refitted for 134A) my rpms drop a little instead of going up and it puts a strain on my engine. Two wire sensor right beside your thermostat housing with black and yellow wires. I read where you need to reset it via the underdash port so it can "find home" or something. Changed EGR valve Jun 20, 2020 · It's a 89 k1500 5. Jul 23, 2018 · Need Help with My '93 Chevy K3500 - 454 TBI problems. when you drive down the road it acts just fine plenty of power and when i come to a stop it dies out again and is really hard to start back. Never getting down to proper idle is likely a vacuum leak. #3 · Jun 24, 2013. Except It does some funky things when idling. 55 F-100 Truck. It is running very rich as well. Apr 22, 2011 · 24 posts · Joined 2011. The 229,000 mile 454 in my '93 Chevy has been running on 7 or so cylinders for a while now. My problem is this. 7L TBI, I've replaced the Timing Chain & Gears, IAC valve, TPS, MAP, EGR & Solenoid, ES Module & Knock Sensor, ECS, Ignition Module, Plugs & Wires, Dist. 68 F-100 Truck 3" Dropped Axles. 4) Random high RPM and idle down issue. Sep 12, 2018 · 1995 k2500 won't idle. I have replaced the IACV, brought it into a non Honda dealer since the nearest Jun 28, 2012 · Lt1 Idle issues. Dec 28, 2015 · I've got a very stubborn jeep that just won't stay running. Twist and pull the vacuum off of the bottom of the air cleaner and lay the air cleaner aside. The truck has a NV3500 so the whole truck would surge. 24. It's hard to get started and either won't idle on it's own or will seek up and down like in the video. 3L Rough Idle - TBI Question. May 23, 2019 · Engine Size. 3L tbi v6 runs rough and bogs down. Observing the temperature on the 3. it will startup just fine but when it idles down it just dies out most of the time. Or a plugged exhaust. it won't idle correctly-most of the time it. And since has improved. Step 2: Press the accelerator pedal ALL THE WAY to the floor and hold it for 40 seconds. I have spent countless hours going over the engine looking for vacuum leaks and believe every thing is OK on that front. I had invested the money in buying a comp cams, thumpr cam. It does this with both old and new TPS Nov 8, 2009 · Recently bought a used 92 Sub with 5. Hook it to all ports on that throttle body. and surges or dies!It has no stored codes or. The parts replaced by previous owner were egr valve. so this morning i decide to start up my motorhome and let it idle for a lil while. #6. Remove the wing nut on top of the air cleaner and lift the air cleaner off the throttle body to access the vacuum lines. (100 less than a warm idle in or out of gear normally. currently no codes however the damn thing will not run past a few seconds w/o constantly pumping acclerator pedal, when revving higher you can here misses, and backfires thru TB Apr 8, 2013 · 322 posts · Joined 2009. I did install a new Mellings high pressure high volume oil pump to help out with the cam. Sep 10, 2019 · 350 tbi idles down with a/c on. Boat looks like it has been sitting for a long while with bad fuel and the whole nine yards, working out all the issues. May 2, 2001 · 305TPI with a manual trans. Feb 22, 2016 · Throttle relearn procedure/New battery/Won't Idle or Run. Jumper the A & B connections on the diagnostic link with a paper clip or what not. Location. Hi, my 1993 Suburban was running fine one day and then the next day it starts acting up. Jun 14, 2013 · Joseph. 1994 1500 5. also, the idle continues to bounce with the IAC disconnected and also bounces with the TP sensor disconnected. Before the motor was pulled it would stall when put into gear every once in a while, never threw codes, ran perfect other than the stalling. m. I replaced the map sensor, the plug wires, the spark plugs, the rotor and cap, and the ignition coil. UnPlug IAC, Turn key to "off". half the bolts were backed outGot that together, ALSO replaced 8 plugs, 8 wires, coil, module, cap, rotor button, rebuilt TBI unit, resealed TBI base, removed the high idle dashpotand replaced the remainder of the vac lines Idle is smooth725 in gear, 825 in park. 3L V6. Vacumm leaks will rise your idle Are common causes for high idle. 1995 Chevy C1500 V6 4. Stuck EGR, baked EGR base or intake gaskets, rotten hoses, worn throttle shaft bores. Wait a moment, turn truck back on. System is going lean, and after 20-30 seconds of running lean, then goes into open loop forever. com Free App. Nov 24, 2014 · I have a 97 Suburban 5. Hello all, Recently bought a 91 crewcab square with a 454 TBI with a 4l80e behind it, after vehicle has been shut off, after more then 30 seconds it won't restart, found injectors to not be pulsing on startup/spraying fuel. 7L TBI Dies at idle when warm. Mine was doing the same thing and it was the tps. - New fuel pump and fuel filter. The IAC. 97 F-150 Extended Cab Dropped 4" 6". i usually do this every other month or so. In gear it stalls out. Check the tps also. volvoclearinghouse UberDork. Once above 160°F, turn the idle speed screw so that the idle is about 50 RPM below your target idle speed set in Step Feb 24, 2011 · TBI Part throttle Chugging/power loss. Check everything including TBI adapter plate. Greg. On hard acceleration it is bogging down like there is to much air, because sometimes it backfires. I've been procrastinating fixing this At red lights and stop signs the motor will idle down to 1000 rpms and sounds good but then drops to about 500, it does not stall but it does sound rough. Those sensors fail to high resistance, making the engine controller think the coolant iis -40F and really lay on the fuel heavy to choke the engine. Nov 26, 2020 · Takes 3 restarts. The surge is like a whup-whup-whup-whup until I add throttle and rev it out. Sep 30, 2023 · 7 posts · Joined 2023. It fires right back up very easily. When tearing into the engine I had to have a valve job done on the stock cast iron heads. Drives great for a while. #1 · Apr 22, 2011. 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 Dec 10, 2013 · 1990 Chevy 350 TBI wont idle. I have restored it and it is in very good condition mechanically and cosmetically. Praying that someone can help me diagnose this issue I'm having. Aug 11, 2018 · If the engine speeds up, there is your leak. wg kx vv lu ih wb tk gh mt gi