unstable high idle with 1988 GMC S15 pickup 2.8L fuel i


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unstable high idle with 1988 GMC S15 pickup 2.8L fuel injection

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dance
New User

Oct 23, 2008, 1:01 AM

Post #1 of 5 (3437 views)

unstable high idle with 1988 GMC S15 pickup 2.8L fuel injection	Sign In

I have a 1988 GMC S15 pick up. The idle is not stable and floating between 1600-1800. Is there anyone knows what this problem could be? Your answer will be very much appreciated.

(This post was edited by Tom Greenleaf on Oct 23, 2008, 1:37 AM)

DanD
Veteran / Moderator
DanD profile image

Oct 23, 2008, 3:00 AM

Post #2 of 5 (3431 views)

Re: unstable high idle with 1988 GMC S15 pickup 2.8L fuel injection	Sign In

Check that the gasket between the throttle body injection (TBI) unit and the intake manifold hasn’t failed. This was a very common problem that a section of the gasket would break away allowing un-metered air (vacuum leak) to enter the engine.

Dan.

Not sure what you had written for Tom to edit your post but I know he would have had his reasons; just be careful what you type.

Canadian "EH"

Tom Greenleaf
Ultimate Carjunky / Moderator
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Oct 23, 2008, 4:43 AM

Post #3 of 5 (3427 views)

Re: unstable high idle with 1988 GMC S15 pickup 2.8L fuel injection	Sign In

Great suggestion Dan as usual. I simply removed a hyperlink that and should have said that in first post. Copied posts from other sites come with their ads in hyperlink form. The post reads exactly as it was posted.....

T

way2old
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way2old profile image

Oct 23, 2008, 6:00 AM

Post #4 of 5 (3424 views)

Re: unstable high idle with 1988 GMC S15 pickup 2.8L fuel injection	Sign In

Must have come from trustmymechanic. Answered it over there too. Good answer Dan. Now he has at least 3 of the samwe answers.

Being way2old is why I need help from younger minds

dance
New User

Oct 31, 2008, 12:48 AM

Post #5 of 5 (3397 views)

Re: unstable high idle with 1988 GMC S15 pickup 2.8L fuel injection	Sign In

Thanks Dan! I will check that out and let you know.

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