Question about 2000 Pontiac Sunfire

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Automotive car wont idle unless i pull vacuum off of throttle body

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  • sgp1976 May 11, 2010

    is there a check engine light on or come on at one time recently?



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Couple of things to check first check that your air filter and pvc filter are clean as well as all other vacuum hoses are hooked up properly and not showing any sighns of cracksalso check your egr valve by performing vacuum test on it or you can manually push the plunger up through the bottom of the vavle and the car should die out. also check for a leak in the intake manifold gasket

Posted on Mar 02, 2010


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My 97 Dodge ram Van won't stay running.

Unless the vac leak is very large, it would not keep the engine from idling.
The computer controls idle speed by regulating how much air enters the intake thru the throttle body by use of the idle air control valve.
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1 Answer

Wont idle down

your IAC idle air control sensor is probably gunked up and if it is so is your throttle body...also check all vacuum line for integrity..i found a bad hose going to my MAP sensor..both of this caused problems.
Clean the IAC with throttle body cleaner not carb cleaner, and dont clean the map sensor its contolled by air vacuum, just replace the hose if found cracked, if its bad you have to replace it it cant be adjusted.

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Jeep will not start unless you give it gas and then after it is running if you take your foot off the gas pedal it dies. Car has new starter.

It's nice that your starter is new, but your starter does not start the turns the engine so it can start. So it has nothing to do with your problem...I would check for vacuum leaks at each and every vacuum hose. Then look at possible throttle position sensor and idle control valve./ valve passages. (there are electrical tests you can make on these and valve can be cleaned with carb cleaner, (carefully without turning internal plunger.)

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clean the IAC. Use spray carb cleaner and spray the idle air control valve. It is on the throttle body near the throttle plate. It may have become stuck with deposits.

Clean the throttle body as well. Check for vacuum leaks

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I have a 88 chevy pickup 1500 with a 4.3 liter engine. I have high idle problem. I would do it once in a while and quit. Now it up and wont idle down. I have new throttle position sensor, map sensor. all...

is the check engine light on ? if it idling high chances are you have a vacuum leak take a can of carb cleaner and spray the egr valve and if the engine rpm changes replace egr valve the throttle body may also be plugged pull the vacuum line off the map sensor start vehicle and see if you have vacuum if not remove throttl body and clean vacuum passage hope this helps

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