E28 rough idle when cold. Idles great when warm?

E28 technical advice asked and given! Troubleshooting, modifications and more.
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JEDCO
Posts: 7
Joined: Jun 11, 2016 2:40 PM
Location: CA

E28 rough idle when cold. Idles great when warm?

Post by JEDCO »

Maybe the idle control valve? vacuum leak?
shallam
Posts: 23
Joined: Dec 30, 2020 10:30 AM
Location: SLC

Re: E28 rough idle when cold. Idles great when warm?

Post by shallam »

My comments are specific to the M30, but I’d look at:
-vacuum leaks
-coolant temperature sensor
-cold start valve
-idle control valve
-AFM adjustment

I’d more or less go in that order as well.
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