91 80q surging idle
Jim Bresee
Jim.Bresee at allscripts.com
Tue Feb 17 10:39:10 EST 2004
Howdy,
My sons 1991 80q idles fine when cold, but as soon as it warms, the idle
begins surging about 400 rpm with a 1 second cycle time.
Here's what I've tried so far to diagnose it:
1. looked for vacuum leaks - did not see any
2. Removed the electrical connection to the ISV - no change.
3. Removed the electrical connection to the WOT and IDLE switches -
engine races
4. Checked resistance on idle switch - 9.6 ohms at idle, open when
throttle is advanced.
Any idea what I should look at next?
Thanks!
Jim
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