Question about 2002 Ford Taurus

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My 2002 Ford Taurus will shutter and die when running the air conditioner and sitting idle at a stop sign or stop light. When I turn on the air conditioner the rpms will fluctuate up high above 2 and then down below 1 then the car will die. If I turn off the air conditioner when idle the car revs fine no problem. I have replaced all spark plugs and wires, coil on cylinder 1, and EGR valve. My check engine light was on with codes PO401, PO171, PO174 and then found a loose vaccum hose. Fixed the hose, cleared the codes and the check engine light hasn't come back on.

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The idle air control valve is responsible for engine idle.
this is a common failure on ford's. but I don't think yours is bad because it does idle high befor it dies.
you stated you had codes p0171 and p0174 these are lean codes for bank one and two, you said you found a vacuum leak and repaired it, the vacuum leak was mostly likely the cause of the lean codes, however the pcm has calibrated the fueling stategy for this lean mixture, what you need to do is erase the KAM "keep alive memory" this is done by unhooking the negative battery cable for 60 seconds, this is the only way to erase the KAM the $6000.00 machine I use wont even do it.

once the KAM is clean the computer will go into a relearn state and all operating values will be adjusted for the vehicles current condition, during this relearn session the vehicle may have some driveability issues (low or high idle, stalling, poor fuel economy) the relearn should complete within 10 minutes of idling and then 10 minutes of driving.

good luck and keep me updated

wesleyschacht@hotmail.com

Posted on Jun 14, 2009

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When the a/c comes on, the idle control is supposed to raise the idle to account for the load of the a/c being on. If the idle air control does not raise the idle, the engine computer will kick up the idle momentarily to keep the car from stalling. have your idle system checked

Posted on Jun 14, 2009

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