Question about 1999 Jeep Grand Cherokee

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I was told that the throttle plate being hung open is only way a engine could run wide open. So with breather removed looking in top of throttle body little flapper is closed till push pedal down, Is this what there refering to as throtle plate

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Yup

Posted on Nov 13, 2010

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Sir the throtle plate it has a diffuser that when the throtle is wide open it wont the air in and you have to take the two screws out and slide the plate out and cut the diffusser is a piece of metal that prevents the engine to go into wide open position I have the same problem with my 99 tahoe 2dr 5.7 Im looking for another plate in the junk yard to keep it original in the future. good luck.

Posted on Nov 18, 2012

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My ford Taurus stalls out unless my foot stays on the gas. I was told it was the engine coil so I replaced it and no difference. I was also told change the spark plugs and I did and still no difference.


You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.

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Throttle going wide open in 1st gear and staying there for about 5 sec


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idle air control is looking for base idle. throttle body base idle plate is dirty with carbon. cleaned out throttle plate with carb cleaner and tooth brush. use rags to catch black carbon.open plate.by some one hold throttle plate open with gas pedal. engine not running. after completed, start engine. run 1500 prm for a short time to clean out excess fluid. that should fix your problem..

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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.

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Throttle sticks somethimes in park or at a red light or stop sign. Engine races between 2-3 rpms without touching the gas pedal.


You need to take the breather tube off of the throttle body and clean the throttle body and the throttle plate with carburator cleaner to remove the gumm that is causing it to stick.Be sure to do the top and bottom of the throttle borewith a clean ragg. It's all gummed up from the Ethanol Fuel that you can't but help put in it. Ethanol Fuel is bad for todays cars!!!

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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.

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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.


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Engine continually has high idle, wont kick down. also the choke light comes on when not pressing on the gas and makes an anoying sound. but only when not pressing the gas. what could this be? other than...


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