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rough cold idle - eliminated alot of possibilities already 200 1993

posted by  robbmcc on  Mon Dec 15 13:22 CST 2003
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last visit: Thu Oct 23 08:41 CST 2014
[RELATED]

Hi All,
OK I know this is near nit-picking but it has extremely poor/rough idle for the first 30 seconds or so on a dead cold start. After that it's purrrfect. Recent work (in the last few thousand miles): rotor, cap, wires, plugs, new fuel pump and filter, cleaned throttle body and flame trap, had the injectors rebuilt and went over all the vacuum lines. Poking thru the FAQ it seems like the Idle Air Control valve might be a possiblity although high idle seems to be sympton there. I was wondering if a marginal ECU engine temp sensor could account for it. Any other suggestions would be really appreciated. Also by dead cold I mean it only does it after sitting 8 or more hours at below freezing. Anything above freezing and it is fine.
Thanks,
Robb






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