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1987 GMC Safari Fast Idle

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olii2d
New User

Nov 24, 2010, 12:01 PM

Post #1 of 5 (2209 views)
1987 GMC Safari Fast Idle Sign In
 
I have a 1987 GMC Safari with 4.3 engine that idles too fast.Replaced the idle control valve without any change.
Any ideas what I could try next?
Thank you
Roger


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 24, 2010, 12:05 PM

Post #2 of 5 (2202 views)
Re: 1987 GMC Safari Fast Idle Sign In
Look for air leaks somewhere. The vacuum is controlled by metering air flow into the engine. If it's getting unmetered air from anywhere, it can control the idle.



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Elise Car Tech
User

Nov 26, 2010, 9:51 PM

Post #3 of 5 (2178 views)
Re: 1987 GMC Safari Fast Idle Sign In
Can you post the IAC counts, and is it possible for you to take a photo of the data stream while the engine is at high idle and post the picture?


Disabled live link


(This post was edited by Sidom on Nov 26, 2010, 10:04 PM)


Sidom
Veteran / Moderator
Sidom profile image

Nov 26, 2010, 10:06 PM

Post #4 of 5 (2173 views)
Re: 1987 GMC Safari Fast Idle Sign In
Elise Car Tech.

Please stop posting live links to other sites, you've been asked before to stop doing this..


way2old
Veteran / Moderator
way2old profile image

Nov 28, 2010, 3:49 PM

Post #5 of 5 (2154 views)
Re: 1987 GMC Safari Fast Idle Sign In
Look down inside the throttle body for any sign of the gasket being sucked in and causing the air leak that the ECM is trying to compensate for. It is a fairly simple and inexpensive DIY project.



Being way2old is why I need help from younger minds





 
 
 






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