Question about 1999 Ford Taurus

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1999 ford taurus idles at 2200 when started then after 30 seconds drops to 1600 and stays there. replaced pcv, Idle valve, throttle sensor, and cleaned MAF, found no vacume leaks. Still fast idle.What next?

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  • racestarter1 Jan 02, 2011

    Changed sencor could find no leak, No change. Now what?

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  • Ford Master
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Hi, have you checked your intake manifold gaskets for a leak? If not, start the car and spray carb cleaner on the gaskets, If the engine speed changes, you have a leak. Also recommend you verify the throttle is closing fully. please let me know if you have questions or need instructions for changing the gaskets.

Posted on Jan 03, 2011

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  • Master
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Check your coolant temp sensor if it's bad it will idle high keeping the car running lean and rich,if ok I would suspect a intake leak.check again.










TIM

Posted on Jan 02, 2011

  • timothy hester
    timothy hester Jan 03, 2011

    when you replaced the isc sensor did you go through and reset the computer?If not it will not idle correctly,first disconnect battery neg side for 10minutes,then put car in drive with brake on and a chalk let it sit in drive for 15minutes,turn off and drive 1drive cycle about 15 miles then it should be reset.










    tim

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