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Idle Surge

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ozzeran

15+ Year Contributor
232
0
Jun 21, 2004
Arlington, Texas
This is for my bone stock 1995 GST.

My idle is surging any time i push the clutch in. Will go from 1200-1500 rpm back and forth. Check engine light came on. I went to VFAQ and went thru the list.

Replaced the biss o-ring
Checked throttle body gasket
Tested the ISC motor and the results of that test were fine


Hooked battery back up and car was fine for 4 weeks with no check engine light and no idle problems.

Week 5 it has come again. Check engine light on and idle is worse than before. On the original CEL it showed a problem with the ISC itself. I have not had it checked this time around.

My question is: If the CEL said there was a problem with the ISC and the ISC tested fine then what else could it be??? I know that ISC motor is very expensive and dont want to replace it if it tests out fine. Please anyone that can assist me further with this.
 
Problem is 90% of the time the ISC. It's possible that it could be the TPS. I would try and find someone near you with a good ISC in their car and switch them out real quick to see if yours is indeed the problem.
 
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