Bad idle on cold starts only.. Need some advice

[ypresman]

Need some help diagnosing an issue with a 1989 325i Convertible... Day after buying the car I noticed on a cold start the idle is wonky and goes up and down and sometimes even stalls the motor.. Unless I give it a bit of gas and as the car warms up a bit it runs great.. Only issue is when it's not warmed up it acts as if it has a bad ICV but I assume if the ICV is bad it would idle poorly even when warm... Any info would be helpful ... Thanks


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[ypresman]

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[sketchkid]

Advice please I'm having the same problem I think its vacuum leak


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[TobyB]

The easy answer is that there's an air leak in the intake somewhere.
Search "smoke test" here for lots of ways to figure out if/where/how...

t

[Seawolf]

Check your temp sensor (blue plug) cold ohms should read 3500-4000 Ohms. If that checks out recheck at DME pins 24 & 45 - you should get the same reading.

If you don't then check the wiring in the C191 connector (under the intake manifold).

Without a good signal from the temp sensor the DME won't supply correct fuel for cold start or run conditions.