Mechanics

CHEVY ENGINE IDLE

1999 Chevrolet Lumina

Engine problem
1999 Chevy Lumina 6 cyl Front Wheel Drive Automatic 100000 miles

We recently put a rebuilt motor in our 99 Chevy Lumina. After getting it all installed we start it up and all we get is vey high idle, I'd say around 3000 rpm. When we open the throttle you get some response and the engine revs higher. Do you have any suggestions as to maybe a sensor or something that could cause this?
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T75dkm3
December 25, 2007.



Check for a vaccum leak. If one of the vaccum lines was left off, the engine would suck excess air into the intake manifold then the computer would compensate by increasing the amount of gas it was allowing, Hence the rpms would increase.
If there are no vaccum leaks suspect a faulty iac motor.

Tiny
Rowtiear
Dec 25, 2007.