I took a look at the idle and it appears to close when the gas isnt being applied and the engine shuts off. I stuck a piece of paper in the idle at the point where it shuts off the engine. This kept it "open" and the jeep runs at idle with no problems. What is wrong with the idle? I am thinking the piece of paper isn't a long term solution.
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Re: Jeep won't stay running when idling
The throttle plate is supposed to be closed at idle...Idle air enters through a port controlled by the iac valve which takes its instructions from the computer. BUT...the computer only knows what it has been "told" by other sensors...throttle position sensor map sensor and manifold air temperature sensors all have a lot to do with this. The iac valve can be removed and cleaned with carb cleaner, as can the passages that lead to and from it. DO NOT turn the plunger on the valve and don't loose the small "o" ring seal. Always check all vacuum hoses and connections before working on other parts. Often you will find a small vacuum leak that when corrected avoids major work. You can test nearly all components using a digital volt ohmeter and a manual such as chiltons or haynes as a guide. (cheap...around twenty bucks) Careful testing avoids buying expensive parts you don't need. Ask if you need specific help with anything. Good luck
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Year/make/model??? Applying vacuum to the EGR and making the valve open will not be the correction. Once opened, this valve allows unburned exhaust gas back into the combustion chamber resulting in a rich mixture. The computer sees this rich mixture and reduces the injector pulse allowing the idle to slightly lower. If the vehicle were at proper idle speed and this valve is opened, it would run rough snd possibly stall
If it is still running away then you might have a vacuum leak or a stuck throttle.... turn off the engine get someone to step on the gas and watch the action of the throttle cable and look to see if anything is sticking...under no circumstance do you fire that engine while your body is under the hood.....if that fan belt snaps or a piece of clothing gets caught in the moving parts it will end with a trip to the hospital.
May be idle issues. Clean the throttle body bore and plate and check and clean the Idle Air Control valve as these two things can cause one too die out at idle. Could be a vacuum leak causing a lean condition. Check all vacuum connections for cracks and looseness.
Could be a problem with the mass airflow sensor. The sensor can be removed and cleaned with brake cleaner or carb cleaner. Can also be a clogged or stuck closed IAC intake air control. Also can be cleaned with the same sprays.
If you know for a fact the throttle plate is closed, and there are no vac leaks, the only thing left is the idle air control valve on the side of the throttle body. It may be stuck open. The computer controls idle speed by how much air enters the intake thru the control valve.
It sounds like there is a problem with the Idle Air Control (IAC) valve. Its job is to open and let air into the manifold when the throttle is closed at idle. If it does not open, the engine dies at idle. The IAC is mounted on the throttle body. Possibly the valve is clogged or stuck, in which case it could be ok again if it is removed and cleaned. Or it is broken, and needs to be replaced. Or, there is a problem with its electrical connection, that needs to be traced. Good luck, let me know if you have any questions.
do this. Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
If it idles that fast, the throttle isnt seated all the way down, either the linkage is stuck or the choke mechanismisnt letting the throttle close all the way. On a 2 barrel carb, if the secondary throttle isnt closed all the way it could also do that. Try cleaning the secondary throttle bore and make sure it operates smoothly and closes completely.
It could be a couple things. There may be a vaccuum leak in the fuel system such as a bad EGR or PCV valve or the throttle position sensor. I'm leaning towards the throttle position sensor needing replaced. The throttle position sensor reads how far you're pressing on the gas peddle and then feeds that to the computer telling it how much gas to feed to the engine. If that sensor isnt working right then your car will get enough gas to start and idle but will starve for gas as soon as you try drive and will then stall.
I have the exact same problem it took awhile before I figured it out.This car requires the medium octane gasoline .The 87 octane gas causes the engine to run on the lean side and triggers the "service engine soon light".By putting in a higher octane gas (middle range 92 octane) the light won't come on.Or you can get your service mechanic to set a richer gas mix for your car,however you'll lose about 2-3 mpg .