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blazer hihg idle

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Oct 8, 2009, 7:26 AM

Post #1 of 4 (1699 views)
blazer hihg idle Sign In

88 blazer 2.8L 220 injector unit 40,000 miles. it idles at1200 rpm on dashboard tach. in drive it goe's down a little bit. put new air cleaner gasket on. hasn't been tuned up in maybe 2 years.

Veteran / Moderator
way2old profile image

Oct 8, 2009, 12:33 PM

Post #2 of 4 (1694 views)
Re: blazer hihg idle Sign In

Look down inside the throttle body to see if you can see any gasket material that has been sucked inside the throttle body. If the gasket os torn, the rpm's will increase due to excessive air and the ECM will add more fuel to compensate for the extra air.

Being way2old is why I need help from younger minds


Oct 10, 2009, 7:30 AM

Post #3 of 4 (1686 views)
Re: blazer hihg idle Sign In

i checked that didn't see any gasket in the way. i'm going to try some iac valves that i can get from ajunk yard . for now i'll be closing this post. thank's for your answer.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 10, 2009, 7:40 AM

Post #4 of 4 (1684 views)
Re: blazer hihg idle Sign In

Using junkyard parts can cause you even more headaches than you have now.

If your going to take the path of throwing parts at it, then change the whole throttle body including the IAC. You may have a better chance.


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.

(This post was edited by Hammer Time on Oct 10, 2009, 7:41 AM)

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