Question about 1992 Mercury Topaz

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Adjusting the idling

My 92 topaz idles very high. I tried to find someplace to turn it down with no luck. any suggestions how to adjust the idling?

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  • crazykytti Dec 14, 2008

    Thank you I will take a look for a vaccuum leak and if there is none, I will try to change the motor.

  • yadayada
    yadayada May 11, 2010

    IDLE SPEED IS NOT ADJUSTABLE, IF U TRY TO TURN IT DOWN THE POWERTRAIN DCONTROL WILL TURN IT BACKUP, CHECK FOR A VACUUM LEAK AT THE INTAKE, ALSO TEST THE SYSTEM FOR TROUBLE CODES, DISCONNECT THE IDLE SPEED CONTROL MOTOR AND SEE IF THE IDLE LOWERS, IF IT DOES THEN REPLACE THE ISC MOTOR.

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I had the same problem with a 87 topaz we had to turn down the timing it took like ten min.

Posted on Dec 26, 2008

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I had the same problem. It was the idle air control valve. It sits on top of the intake just downstream from the throttle. There's a valve rod inside that gets worn over time and starts to stick. If that's what is causing your problem, you need to replace the unit.

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