hankosolder2 Posted November 5, 2007 Share Posted November 5, 2007 Greetings All-- My '98 Legacy OBW 5MT has a high idle 1100-1500 rpm when hot. I think the problem began after the car sat for a week. I don't think it's the CTS as the fans cycle normally when the engine is warmed up- so the computer knows the engine is up to full operating temp. I did a cusory check for vacuum leaks. I suspect a sticking idle air control valve. Attempted cleaning of the IAC didn't do it. I'll track down the problem, but I have a question- I know that the ECU is programmed to cut fuel to one cylinder & set the CEL when the idle RPM exceeds a particular number. (I read this somewhere and experienced it first hand a while back with a stuck open IAC on an engine which had sat for a year.) Does anyone know what the magic RPM number is? Nathan Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted November 6, 2007 Share Posted November 6, 2007 I know that the ECU is programmed to cut fuel to one cylinder & set the CEL when the idle RPM exceeds a particular number. (I read this somewhere and experienced it first hand a while back with a stuck open IAC on an engine which had sat for a year.) Does anyone know what the magic RPM number is? Sorry I don't know the magic number but I know there is a note on endwrench.com about exactly what you mentioned. Quote Link to comment Share on other sites More sharing options...
hankosolder2 Posted November 6, 2007 Author Share Posted November 6, 2007 Sorry I don't know the magic number but I know there is a note on endwrench.com about exactly what you mentioned. I found the endwrench note and it doesn't give a specific RPM; it just states that then the ECU determines it has lost control of the IAC, it kills the injector pulse to one cylinder at idle. Nathan Quote Link to comment Share on other sites More sharing options...
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