Question about 1994 GMC Jimmy

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4.3 cpi rough idle ,pops on acceleration to

4.3 cpi rough idle ,pops on acceleration to intake,54 psi fuel,new tps/fuel filter/fuel,motor dies when throttle opens,no codes

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Chk theTPS Throttlrposiyion sensor Good luck, Ned

Posted on Sep 27, 2009

  • Ned C Cook
    Ned C Cook Sep 28, 2009

    The throttle position sensor will affect smototh acceleration. The maf sensor affects air fuel ratio. If it runs lean it will baackfire. Ck the MAF sensor for dirt contamination. It's in the intake duct in a metal section of. Spray clean with CRC electical cleaner. spray wash only, do not rub, brush or touch. Use NO compressed air. the sensor is fragile and expensive to replace. Good Luck, Ned

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Did you check for vacoum leaks?

Posted on Sep 26, 2009

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1997 buick lesabre- scan codes p300,p420,p1870,p1641. new plugs,wires,oil,filter,throttle blade cleaned,maf sensor,tps changed. now no acceleration with rough idle. could it be iac valve?


How about a blocked exhaust converter

They only last 12 to 14 years, under perfect
fuel trim conditions, with no misfires & you have
those or did

You changed the fuel filter & checked pressure at the motor?

IAC-Idle air control--so no--idle control is not your problem

Oct 07, 2014 | Cars & Trucks

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My 96 ford bronco runs rough on acceleration,idles fine. Runs good under light acceleration but if hit the gas hard runs bad and pops. Changed fuel filter no change.what next?


givit a tune--new distributer cap--new plugs and cables--------also have air intake cleaned plus idle control--use a nonchlorinatd solvent sold a napa etc

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I've got a 1996 jeep grand Cherokee with the 5.2 v8 fuel injected Holley throttle body. My problem is while driving at soft or low acceleration it accelerates fine, but if you hit the throttle hard it


I would check the voltage on the throttle portion sensor with the engine off from idle to wide open throttle.If there are any dead spots, replace the sensor. If the tps checks out, you should check fuel pressure. If you have good fuel pressure, you may want to make sure there isn't a lot of slack in your timing chain. I don't believe you mentioned the mileage of your vehicle. Best of luck.

May 03, 2014 | 1996 Jeep Grand Cherokee

1 Answer

Engen problem and missing


Sir, your question is not very clear, but I will still try to post a solution here. Engine missing could be due to any problem in fuel system, ignition system, engine or ECM as well.

LOW ENGINE IDLE SPEED (Poor idling):
-Throttle body (do the cleaning and idle speed learning)
-A /C signal circuit
-Fuel pump control circuit
-Fuel pump
-Intake system
-P C V valve (clogged or open) and hose

ROUGH IDLING:
-Cylinder Compression
-Ignition system (Igniters, spark plugs, wiring harness)
-Spark plug fouled, gap too wide or too short. (1.00-1.1 mm)
-Fuel injector circuit
-E C M power source circuit
-Fuel pump control circuit
-Fuel pump (required pressure 44 psi - 49 psi)
-Throttle body (cleaning)
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Heated oxygen s ens or
-Mass air flow meter
-Idle hunting
-Throttle body
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Mass air flow meter

HESITATION/ POOR ACCELERATION:
-Fuel pump control circuit
-Fuel pump
-Spark plug
-Ignition system
-Fuel injector circuit
-E C M power source circuit
-Mass air flow meter
-Throttle body (do cleaning)
-Intake system
-Valve timing
-Cylinder Compression


Jan 18, 2014 | 2008 Toyota Corolla

2 Answers

Idles great no throttle response


first check make sure it's not flood out 2 check high speed idle if it has one

Jan 10, 2014 | 1996 Mitsubishi Eclipse

1 Answer

My Tiberon idles very roughly, but runs great on the road. I pulled the idle air solenoid today and cleaned it out,I made it run worse. do these go bad?


No mention of any diagnostic trouble codes so I would remove large rubber intake tube from air
filter box to throttle body. Only remove from throttle body end lay out of the way. You willneed a can of carburetor cleaner and an old tooothbrush (not a little wire brush). Look inside throttle body and you will see the throttle plate. Reach and pull on throttle cable to open throttle plate fully. When open coat throttle plate good with carburetor cleaner, take toothbrush and scrub carbon deposits from throttle plate paying special attention to both sides. Carbon build-up in and around where throttle position sensor comes through inside of throttle body and connects to throttle plate causes throttle plate not to close completely when accelerator pedal released at idle. This can allow too much air into intake causing rough idle and also can cause Idle Air Control Motor not to be activated due to throttle plate not closing far enough for TPS to recognize throttle cable has been released. The IAC picks up and maintains engine idle until accelerator is depressed and TPS resumes engine rpm control depending on accelerator pedal pressure.
It is also possible that IAC stepper motor is going bad. Normally if this occurs check engine light will illuminate with a diagnostic trouble code for IAC P0505, P0506, or P0510.
Sorry it is so lengthy but pretty simple procedure. Hope it helps.
***Note*** Some throttle bodies have a wax pellet in bottom side of chamber so careful not to let
carburetor cleaner puddle in bottom when sprayed.If cleaner is allowed to puddle and eat up the pellet you have to get another throttlebody. Pellet cannot be bought seperately. When you pull throttle cable you can stick a small rag down in there to catch excess cleaner.

Aug 17, 2011 | 2001 Hyundai Tiburon

2 Answers

Car dies out when I accelerate. Idles ok. Its getting gas but when I take off it stalls


There are 3 likely causes for your problem. It could be any 1 or a combination of the 3.
  1. Bad MAF (Mass Air Flow) sensor
  2. Clogged or bad fuel injector
  3. Bad TPS (Throttle Position Sensor) This controls idle speed when the engine is cold, warm, or with the AC on.
Most often it's #3. Most large auto parts stores will perform a complimentary diagnostic test on your car. This will give you error codes stored in the car's computer and allow you to hone in on the problem.

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1 Answer

Have a 98 sonoma rough idle poor acceleration and flashing engine light


HAVE VECHICLE SCANNED.AT AUTO ZONE THEY WILL DO IT FREE.SOUND LIKE FAULTY TPS SENSOR,FAULTY EGR VALVE OR O2 SENSOR.MANY THINGS WILL CAUSE ROUGH IDLING LEAN MISFIRE CAUSED BY VACUUM LEAK PVC VALVE OR INTAKE.CLOGGED FUEL FILTER,DIRTY FUEL INJECTORS.GETTING CAR SCANNED WILL SAVE YOU TIME AND MONEY.

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1989 corvette runs rough, wants to stall even after new plugs and rotor.


i want to give you the right answer but the only thing i think of is the mass air flow sensor.

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