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High Idle - Not IAC?? 700 1991

posted by  jerryc on  Thu Aug 5 21:00 CST 2010
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last visit: Wed Oct 8 21:28 CST 2014
[RELATED]

My suggestion is to print out the OBD procedure and follow it exactly. Don't skip anything, and be sure to follow closely. Although yours is an early version, I have a 91 and had a 90, and they do work and can tell you things.
Also, I did a temp sensor last year. Yes it looks difficult. No, it is not that difficult, and I did not pull the intake to do it, which a famous supplier said was the easy way. It took me about an hour, with a deep socket, a short open end, and some patience. And swearing. But not too much.
I think if you do it, pulling the IAC helps and you can clean it out per the FAQ at the same time.
But as someone else said, drain some coolant so you don't get it all over.
Oh, and check the bottom of the bellows from the air sensor to intake. One of mine developed a hole there.






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