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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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Old 10-05-2007, 07:50 AM
To///M To///M is offline
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Location: Germany
 
Join Date: Jul 2007
Posts: 25
Mein Auto: 335 Cabrio
Z3MC - Unstable idle...

After my car warms up, the rpm on idle starts jumping from 300rpm to 900 rpm, and sometimes dies... if i rev it while in neutral to high rpm and leaves the throttle the car dies, and also while holding the clutch on brake.

i've tried cleaning my icv - i noticed 2 things while doing so -
1. the mechanism inside is loose - it's spinning while i'm moving it fast. should it be like this?
2. there is an arrow embedded on it, it's poiting to the side that is connected to the throttle body, and the other side it connected to the intake plenum - is that right?

i've tried changing the spark plugs - still the same problem.

i have no maf - i have a piggy back and it's map based...

there are no idle maps and neither maps for below 0 psi

what else should i consider?

thanks,
Tom
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