Idle issues!

[Mark McCrary]

Ok so my POS Cavalier idles really weird. It will be normal and then just randomly rev to somewhere around 4K and stay there, the car gets so loud I shut it off.

I have replace the oxygen sensor, MAP sensor. I really don't remember the car doing this till after I changed out the valve cover gasket.

I from reading up I do not think it could be the egr valve.

Could it be a IAC sensor, TPS sensor, vacuum leak? Something else?

Thanks,

[Mark McCrary]

Also could it be the ECU bad?

[flier129]

My first guess would be a vac leak, Ive had a miata do just as you described with a bad vaccum leak. The leak was on the intake manifold.

Could be something totally different and I don't know anything about cavaliers.

[integra55]

My first guess would be a vac leak, Ive had a miata do just as you described with a bad vaccum leak. The leak was on the intake manifold.

Could be something totally different and I don't know anything about cavaliers.

not many people do... or are willing to admit to it

[Scuffcakes]

Next time it does it, get out and tap on the IAC motor with a screwdriver or something light. Could be that it's sticking.

[Mark McCrary]

I will have to take to top or the intake off to get to it but I will try that.