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Idling Problem

Tiny
ROBERTO1
  • MEMBER
  • 1986 PONTIAC FIERO
  • 4 CYL
  • 2WD
  • MANUAL
  • 97,696 MILES
Hey, My fiero idles very high at 2.5 rpm, it used to idle at 1.5. It won't idle down for about 10 mins, and if I drive it before it idles down it gets really shaky and doesn't drive good. Any tips?
Saturday, September 10th, 2011 AT 3:10 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 POSTS
Check for vacuum leaks. If the check engine light is on, have the computer scanned for trouble codes. (I believe they had the OBD1 in 86).
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Saturday, September 10th, 2011 AT 5:31 PM
Tiny
ROBERTO1
  • MEMBER
  • 9 POSTS
The check engine light isn't on and after I've drove it and turn it off for about an hour, I start it and it idles high at 2.5 rpm but then I press the gas and it goes down to 1.5 rpm, do you think it could be the idle control valve?
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Saturday, September 10th, 2011 AT 7:00 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 POSTS
It could be. It could be a simple vacuum leak too. Please bear with me. It's is difficult when the car isn't in front of me. I would recommend checking for vacuum leaks. If you don't find any, then I would move to the control valve.
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Saturday, September 10th, 2011 AT 7:21 PM
Tiny
ROBERTO1
  • MEMBER
  • 9 POSTS
Yeah ill do that and ill tell you what I find, thanks a lot I appreciate your help
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Saturday, September 10th, 2011 AT 7:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 POSTS
I just hope I provided help. It is hard to do when I'm not right there with you. Take care and let me know.
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Saturday, September 10th, 2011 AT 7:35 PM
Tiny
ROBERTO1
  • MEMBER
  • 9 POSTS
Ok, I checked the whole engine, no vacuum leaks, and I was just wondering, how do you clean the idle control valve? And how much is a new sensor?
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Monday, September 19th, 2011 AT 8:45 PM

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