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Answered 2006-11-11 16:12:20

The idle is controlled by a device called "IAC motor". It's located on the throttle body. It can be either extremely dirty or just inopperative.


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its either a vacume pipe leak or in my case a bad throttle position sensor

How high is your idle? idle should be 800rpm good oil pressure is obtained at this idle

Look and listen for a vacumn leak under the hood.

Not really possible. There is an idle speed control on most 1988 v6 machines. If you are experiencing high idle, it may be a broken ISC. The idle speed is controlled by computer.

The idle speed on a 1987 Chevy Celebrity is controlled by the engine computer, there is no way provided to adjust it.

Check for vacuum leaks. The gasket was known to blow out between the throttle body and the intake manifold.

a vacuum leak can cause high idle

Most likely, the idle is set too high. There is an idle adjustment screw on the carburetor.

There really isn't an adjustment just the IAC valve which may be dirty causing the idle to be too high or too low so the Idle Air Control valve has to be cleaned or changed.

High idle, misfire, check engine light,High idle, misfire, check engine light,

No, that has nothing to do with idle speed.

You can not adjust the idle screw, it is sealed off at the factory. If you are having a high idle problem check for a vacuum leak or a bad idle air control valve. These will commonly cause a high idle.

high idle problem on a 1997 sc1 when car is in gear

The idle speed is read by the Engine Control Module(computer) and adjusted as necessary by use of the idle air control in conjunction with the throttle position sensor. There is no separate idle sensor as such.

clean or replace your idle air control valve.

It should idle at aprox 650 rpms warmed up.

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