Question about Jeep Grand Cherokee

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1999 4.0 after mechanical repair put all back together by specs .started up an engine runs wide open without throttle or with throttle

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  • Ronnie Pyron
    Ronnie Pyron Nov 12, 2010

    how do you set throttle position sensor

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  • Master
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You need to set throttle position sensor .check make sure you dont have a vacuum hose off somewheres to .

Posted on Nov 12, 2010

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Throtle gets stuck wide open i did tps worked for a day always pump to start runs ruff then goes bamm gets stuck wide open help me


You should not need to pump the throttle. That does not have any effect on starting the engine on a fuel injected car.
How do you un-stick the throttle ?

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My Honda mixer. Runs very badly and kicks back while starting.


Suspect the timing chain/belt is slipping or out one degree

This is a symptom of its condition but before you check this buy gas line anti freeze pour it in the gas as water in the gas causes piston slap as water will not compress in the cylinder and will make the engine rumble

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1 Answer

1999 Cherokee starts but won't keep running without giving it throttle.


Assuming everything is working correctly, you may have to drive it up to 50 miles for the computer to relearn the basic perimeters.
I think you can also turn the key on, open the throttle to wide open, then close it 2 or 3 times to reset the memory in the computer.
Not sure about Jeeps.

Jan 30, 2013 | 1999 Jeep Cherokee 4WD

1 Answer

I have a 1999 malibu it start and run for short time but them stop.if i started again them it dosent have any signal at the spark plug. it have been 2 days that this is goin up this mornig i started and...


map sensor control fuel delivery and ignition timing.the map sensor is your load sensor when engine closed throttle high vacuum wide open throttle low vacuum.need more fuel and spark.when your engine at wide open throttle. low vacuum.cause electrical volts to increase to 5 volts in which pcm will increase fuel pressure and spark.the map sensor does control spark also.replace map sensor erase code and see what happens.

Apr 16, 2011 | 1998 Chevrolet Malibu

1 Answer

Had 2 problems occur at same time after some repair. 1st. After repair started up an engine runs wide open with no throttle .Checked an cleaned T>P>S. an throttle body . Checked for vacume...


The only way an engine can run Wide open is if the throttle plate is opened all the way, allowing a large volume of air in to the engine. Check the throttle plate and see if it is hung up or possibly the throttle cable is frayed and holding the throttle open. It is not the injectors, they operate on inputs from the PCM.

Nov 13, 2010 | 1999 Jeep Grand Cherokee

1 Answer

After doing sum mechanical repair , Put everthing back together an started up an engine runs wide open with or without giving throttle


This sounds like part two of your other question....make sure throttle return spring is in place and that the throttle cable is free to move and not holding the throttle open. If you had the intake manifold removed, make sure it isn't leaking. If the idle was fine before you did whatever repair you made, most likely you have something put together wrong or left a hose off somewhere..

Nov 12, 2010 | 1999 Jeep Grand Cherokee

1 Answer

I just finished repairing the valves in a 1999 Daewoo Nubira after the cam belt broke. It now has new cam belt, pulleys, tensioners, head gasket, head bolts, and valves. I put it all back together and...


map sincer check that if shorted to low or high it will make it do that check your throttle return spring it may be broken or out of ajustment

Sep 08, 2010 | 1999 Daewoo Nubira

1 Answer

Engin stops sometimes when I slow down, usely starts back up and run fine. Now I am at home it starts then stops, now it turns over but will not start and run.


it has a dirty throttle body. get some carb cleaner and a tooth brush.remove air cleaner hose at the throttle body. block open throttle to wide open {engine off of course} or have someone hold it to the floor.spray cleaner into body and scub with tooth brush especially were the throttle plat touches the bore when at idle and the throttle plate itself.spray brush,spray,brush. put hose back on and start engine. you might have to give it some gas to atart it then its going to run rough for a few seconds but it will clear up.slowly lower foot from gas pedal and allow to idle.put in reverse let run in reverse for a few seconda do the same with drive.it has now began to learn what position the stepper motor should be in when throttle is not depressed.it may stumble a couple of times at sops but will soon correct itself

Mar 20, 2010 | 2002 Chrysler Town & Country

1 Answer

Ford Escort 1.6 1997 Engine runs smoothly but then starts cutting out after a varying period.Replaced air filter, which was dirty, and there was a temporary improvement. The fault returned a few days...


have you attempted to clean throttle plate? I would suggest taking hose off of throttle plate.Hold it wide open and spray throttle body cleaner, (with it not running) let it dry if it is really black or gooey spray and wipe goo and fluid off with a rag.put back together.It may not be problem but if air filter was dirty throttle plate most likely is.

Jun 21, 2009 | 1997 Ford Escort

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