Question about 1999 Ford Windstar

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1999windstar missing prob

I have scanned for codes it stored a po171 a p0174 a po302...p0171 is bank 1 lean p0174 is bank 2 lean p0302 is cyl #2 misfire i cleared codes replaced plugs cked wires.test drove it reset the same codes after 3 drive cycles.i noticed that the miss happens all the time between1300 rpm-1600 rpm..it has no miss before or after that rpm range... i think there may be tsb on this issue..any help apprichiated doyal.

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  • doylecowley Jan 16, 2009

    you are right about the vacume leak.there are split ports on the intake lower half the shaft is worn on the front of the intake under slight load it moves the shaft to cause the lean miss.thanks fore the help .doyal

  • Anonymous Mar 23, 2014

    store tested icm, low rpm failure. with multiple module failures, should this tell me where to look?

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Check the pcv valve vacum lines for a leak a vacum leak will set 171 174 codes. lift the hood with engine running and listen for a air leak , check all vacum lines if no vacum leaks can be found then clean the mass air flow sensor by spraying carb cleaner directly on it for about 5 seconds. in other words take the air filter cover up and spray down the tube that leads to engine. shine a light down hose first and see if u can see the mass air flow sensor so u can get a direct hit

Posted on Jan 13, 2009

  • chris  milliner
    chris milliner Jan 16, 2009

    ok found ot that thare is a TSB on this vehicle, it is a vacum leak setting these codes, and the vacum leak is around the intake manifold gaskets, thare is a upper and lower gasket. replace both intake manifold gaskets and that should do it.

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