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Cold idle - warm idle not steady but ok 700

posted by  DPNY on  Tue Sep 9 09:47 CST 2014
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last visit: Thu Sep 18 18:45 CST 2014
[RELATED]

Thanks for the recent help.

I am left with one last fuel/ignition problem.

My cold start idle will not hold - the car starts instantly and idle will drop to zero and stall. I keep the revs up and in several seconds of rough running it sorts itself out.

Once warm - the idle has a tendency to to go low to about 300 rpm and then come up to 750 - and sit at 750 fine.

In the course of some other troubles I have cleaned idle control valve and throttle body. Checked for vacuum leaks. Replaced air mass meter. Checked connections to idle control switch. Replaced RPM sensor. Swapped my ECU.

So I am looking for a few things to do for this idle problem.

Temp sensor? Engine thinks it is cold?
Idle switch?
Failed idle control valve?

Any other thoughts?

Thanks again.





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