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Six cyl high idle. already replaced tps

High idle on 1996 ford f150 six cyl. already replaced tps

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  • apeacock5 Apr 15, 2009

    no. was looking for any possible sensor probs 1st. all else says possible intake leak also

  • apeacock5 Apr 15, 2009

    i will check for a leak in the manifold . if that doesnt work, i will check maf sensor

  • apeacock5 Apr 15, 2009

    what do i check manifold leak with & how?

  • apeacock5 Apr 15, 2009

    will check tomorrow with spray. Thanx for the help.

  • yadayada
    yadayada May 11, 2010

    use carburetor spray cleaner, if you spray a leak the engine idle will change allot, spray where the manifold bolts to the head..

  • yadayada
    yadayada May 11, 2010

    I am a Ford factory trained tech, check what I said.

  • yadayada
    yadayada May 11, 2010

    The only real cause of high idle on these engines is a vacuum leak at the intake manifold, have u tested the intake for leaks?



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The problem could also be caused by a bad mass airflow sensor. you may be able to get one cheap at a junk yard.

Posted on Apr 15, 2009


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1 Answer

Idles bad

Sounds like you may have an upper intake manifold leak. Typically the gasket between the Plenum and the lower intake dries up and gets sucked into the intake a little causing a leak and a high idle issue. The repair requires the removal of the plenum and replacement of the gasket. NOTE: there is a torx bolt hidden between the center plenum runners and can only be seen by looking straight down at the top of the plenum and it may be covered in dirt. If you have to use a bar to pry off the plenum you probably have missed a bolt. Typically it is the one noted above. Best of luck.

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Possiable IAC valve sticking or faulty TPS.

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Missfiring ford

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