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High Idle problem

Tiny
A79BIGBERTHA
  • MEMBER
  • GMC
1994 Camaro, automatic, 3.4 engine, 130,000 miles
When starting my camaro it idles at 2,000 rpm and slowly raises to 2,500 where it levels out indefinatley. The engine always runs smooth and I have just replaced the idle air control valve, intake air temperature sensor and all of the vacuum hoses. After installing all of this it seems to have no effect on the high idle problem. Please keep in mind this engine does not have a MAF sensor. Also, I have checked and cleaned the throttle valve and it closes tightly. Please tell me what else could be the problem. Thank you.[/B]
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Saturday, February 25th, 2006 AT 2:36 PM

3 Replies

Tiny
DAVID1984
  • MEMBER
  • 7 POSTS
Have you tried you throttle position sensor, that could affect as well.
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Saturday, February 25th, 2006 AT 3:11 PM
Tiny
A79BIGBERTHA
  • MEMBER
  • 2 POSTS
Thanks for the suggestion. I replaced the TPS after you reccomended it, and it did help very slightly though. It is now idling between 2200 and 2300 RPM, which is still way too high. Does anyone have anymore suggestions on what to check next? Thank you for your help.
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Thursday, March 2nd, 2006 AT 6:12 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If the vehicle is a speed density system, map only, A vacuum leak can cause the idle to go high.
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Monday, November 22nd, 2010 AT 9:20 PM

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