idle issues.. my oldsmobile cutlass cierra is overrevving in park and neutral gears its an auto..and then when i switch it into gear the rpms drop off an it acts like its choking and then its normal.
Any ideas from the gurus? It idles high then change to a drive gear and it drops off low to almost shutting off sounds like choking
and then goes to normal idling. havent noticed any difference in actual driving. also its a 1995 but the description doesnt list a
A vacuum leak might be the cause. Check the large hose from the brake booster to the engine.
Definitely check for a vacuum leak. Which engine is under the hood? If it is the 3800, a vacuum leak is definitely the most likely cause. If one of the smaller engines, I would suspect an intake manifold gasket leak. If there are no vacuum leaks, I would check out the throttle position sensor and crank position sensor. Either one can cause these symptoms as well.
its a 3.1 v6 i believe..
turned out to be a tps problem. not sure what that is but its all fixed now, it made it easy to find once the engine light came on.
I'd say it's most likely a vacuum leak
TPS is your Throttle Position Sensor. It was misreading the throttle opening.
I have a 1994 oldsmobile ceria cutless S and I changed the map sensor , Tps sensor, also the idle air flow valve and it's still idling high
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