High Idle on non seq
#1
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Join Date: Oct 2004
Location: Columbia, MO
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High Idle on non seq
I just put my car back together after polishing my UIM and installing an intake and aluminum ast. On startup the car used to idle at 12-1300. After warming up it slowly raises up to as high as 3k. It usually takes a couple minutes for it to go from 1500 to 3000. Vacuum is solid 500 mm hg on my Greddy boost gauge. The car is non seq and it had good idle a couple days ago. No AWS, throttle cable isn't too tight, cruise control isn't causing any problems. I checked the Factory manual and it listed some sensors that might be causing the problem, including water temp and intake temp. I checked these with my multimeter and they were in spec. I've sprayed around the UIM and LIM with carb cleaner and didn't find any leaks. So I'm stumped. Other than the high idle it runs great, boosts solid. Help me!
#4
5yr member, joined 2001
I noticed you eliminated your AWS. If you are running a stock or reprogrammed stock ECU and you have not placed a resistor in the unused AWS connector, then your ISC will open 100%. You need to stick a 330 or 360 Ohm resistor into the unused AWS electrical connector to fool the ECU into thinking you still have one. Eliminating the AWS does not stop the warm-up cycle on its own. On a cold start, if the ECU noticed the revs aren't increasing, then it will have the ISC do the job.
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