May 112010
 

I have a 2000 Pontiac Grand Prix. 3.8 V6 supercharged if the matters. But when the car is idiling in park, the engine will rev on its own. I know its not supposed to do that. I checked the vacuum line, I think thats what it is called, and there was a hole in it. I spliced it and fixed the hole but it still continues to rev up the engine in park? Any ideas why this would happen? Thanks

  2 Responses to “Pontiac engine revving in park”

  1. You still have a vacuum leak present. You can spray starting fluid around the engine (not the exhaust)with it running and should hear a difference when you locate the area of the vacuum leak.

    The other alternative would be to have a local mechanic hook up a smoke machine to the engine to check for a vacuum leak.

  2. or get a throttle position sensor…

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