Question about 1995 Mercury Cougar

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Revving high - throttle stuck?

The car is revving high - no need to put foot on gas - sounds like it is going to blow up - replaced the TPS , took apart the linkages and cleaned but still the problem is there

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  • lufteneggers Jul 28, 2009

    where is that located? I will get my manual out...!

  • lufteneggers Jul 28, 2009

    our engine is a 3.8 - we have an IAC - unhooked that and did nothing?

  • yadayada
    yadayada May 11, 2010

    disconnect the idle speed control valve and see if it slows down

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Side of the throttle body, long round device about the size of a tube of tooth paste with a 2 wire connector to it.

Posted on Jul 28, 2009

  • yadayada
    yadayada Jul 28, 2009

    you have a vacuum leak on the engine, a big one, that is the only thing that will hold the idle up high, get a can of carb spray from the parts store and spray the top of the intake and see if you find a leak, u will here the engine idle change if you hit the leak, I also have seen a few warped throttle bores on the 3.8, this allows air to pass around the throttle valve and causes a very high idle

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  • 4 Answers

Possible stuck idle control mtor

Posted on Jul 28, 2009

  • crankin45 Jul 28, 2009

    with the iac unplugged it's still in the open position..loosen iac and use a matchbook cover and cover both ports between iac and intake tignten iac and restart if it dies iac is bad

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