1989 S-10 Blazer 4.3 with High Idle
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Joined: Jun 2008
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From: Collinsville Oklahoma
1989 S-10 Blazer 4.3 with High Idle
Hello All... I am having a problem with my Blazer. High Idle on start up and will not come down. I have changed the IAC and I know it is most commonly a vacuum issue, but I can't find a leak. Any ideas?
RE: 1989 S-10 Blazer 4.3 with High Idle
My first guess would be the throttle body base gasket. Use an unlit propane torch around the base of the TBI unit with the engine running. Listen for a change in the sound the engine is making.
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