1992 Pontiac Grand Prix high idel

1992 PONTIAC GRAND PRIX
250,000 MILES • 6 CYL • 2WD • MANUAL
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MICHEALHORN
  • MEMBER
  • 1 POST
hi when we stsrt me car it want to run on its high side it goes down some when it warms up but it still does it. i have already replaced the AIC and the TPS along with the temp sensor
Aug 22, 2010 at 8:05 AM
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WRENCHTECH
  • CAR REPAIR CONTRIBUTOR
  • 20,761 POSTS
The idle is controlled by metering the amount of air allowed into the engine. When the idle is too high, it means unmetered air is being allowing in somewhere. You have an air leak somewhere but judging by the mileage you have. I would suspect that the throttle body is so worn, that it's not capable of sealing all the air out. It's probably sucking air in through the throttle shafts and the inability of the throttle plate to fit the bore properly any more.
Aug 22, 2010 at 8:22 AM
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