1987 GMC Safari Fast Idle - Engine Troubleshooting


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1987 GMC Safari Fast Idle

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

olii2d
New User

Nov 24, 2010, 12:01 PM

Post #1 of 5 (2041 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 (2034 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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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Elise Car Tech
User

Nov 26, 2010, 9:51 PM

Post #3 of 5 (2010 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 (2005 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 (1986 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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