Question about 1998 Chevrolet Cavalier

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Idling RPMs and other concerns

I have a 98 Cavalier Z24, and have been noticing a problem when idling at stops. It usually idles smoothly, but sometimes I will be stopped and my RPMs will start jumping up and down erratically. It only seems to happen after the car has been stopped for at least a minute or two. If I shift the car into park, the RPMs go back to normal. Another problem I've noticed is that the acceleration seems somewhat sluggish after being stopped. It seems to stutter for a second, and then takes off. This problem occurs very seldomly, and usually at a quick stop sign. I recently had an oil change and replaced the air filter, but the problem is that if I actually take it in to have someone look at it, they might not encounter these issues during a test drive since they don't happen all the time. Any suggestions would be appreciated.

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  • yadayada
    yadayada May 11, 2010

    shrink the question please, one issue at a time.



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It sounds like the fuel pressure regulator is leaking. This is easy to check. with the car idleing, remove the vacuum hose from the unit, and if it is leaking, gas will come out of the vacuum connection.
If this is the trouble, be sure the replacment unit has an o-ring with it, otherwise the new unit will leak at the fuel rail.

This could be the map sensor issue as well, but check the pressure regulator.

Also, check the hoses near the throttle body area, if there is a vacuum leak, it will do this.

Posted on Dec 13, 2008


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