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Fast Idle on C20xe.


Manta again
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Those idle control valves can be a pig and easy to get the wire mixed up as I think the knock sensor is next to it and has the same connector.

Timing is set by the cam belt so I don't think you will of changed that.

My Brother is having fun with similar issues in his Mancona

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22 hours ago, Kevin Abbott said:

Those idle control valves can be a pig and easy to get the wire mixed up as I think the knock sensor is next to it and has the same connector.

Timing is set by the cam belt so I don't think you will of changed that.

My Brother is having fun with similar issues in his Mancona

If you type c20xe rough idle into Google there is a life time of reading. 

Tonight I adjusted some of the throttle stops which has improved the idle it's now got just a very slight hunt.

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Glad it's not just me having problems, I've changed all the gaskets on the inlet side, fitted new pipes and a new icv.  The throttle switch is ok and set correctly and there's slack in the throttle cable, also adjusted the throttle stop.  It idles around 1800rpm when hot and also hunts slightly.  The plugs get sooty very quickly as well.  Surprisingly the car goes well. 

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