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2004 Mercury Grand Marquis Question: Can I ,a very handy person, change the idle air bypass valve? If so, some detail



Richus, Valley Stream, NY, July 19, 2011, 16:42

The check engine light revealed it has to be replaced

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  • Answer #1

    July 19, 2011, 18:27

    Yes, it is really just 2 -> 8mm bolts and a gasket. Disconnect your battery negative terminal for 5 minutes to let the memory erase, then when you start your car, let it idle for awhile. It will idle faster than normal, then it will gently come down to a normal speed. Then drive your car, it will take a few miles for the computer to adapt to the new idle valve.

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    Visitor, July 20, 2011, 15:12

    Thank you,did as you said & can't wait fot the better MPG!

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