Question about 1986 Chevrolet Cavalier 2 Door

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Idle speed adjustment

How do i adjust the idle speed on my 1986 cavalier 2.0L 4 cyl.?

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While looking at the engine from in front of the car with the hood up..
Locate the TBI assembly ( follow the air intake tub from the cor support back. It leads directly to it ). Next look on the lower left side of the TBI just above the throttle linkage connection to the TBI.
you will see what looks like a little molded bullet sticking off the side with a screw sticking out of it making contact with the linkage assembly. On the back side of that little bullet you will see a torques head type screw head. adjust that forwards to increase idle speed or back it off to lower idle.
If you have a high idle condition the chances are it is not due to the idle set screw. Its more then likely either deteriorated vacum lines, deteriorated TBI gasket or a bad Air Idle Control Motor ( IAC ).
If you adjust the screw and nothing happens worth noting then check the vacum lines and replace. If nothing happens still then change the TBI gasket where it mounts to the intake.
If that doesnt do it then your left with the more costly option of changin out the IAC for a new one. They run from $75 - $125 depending on where you shop.
If after you change the IAC and it is still acting out then you may have an intak emanifold leak, or a head leak.

Posted on May 01, 2009

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