Question about 2004 Chevrolet TrailBlazer

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After replacing battery truck will not remain running in idle in drive while air conditioning is on. will run if air conditioner is off

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Cleaning out your throttle body will probably fix this. Sounds weird, but your throttle body builds up junk over time and if you disconnect your battery, your computer gets reset to stock settings and thinks it is getting the same amount of air as when it had a new (clean) throttle body. This messes up the airflow calculations, especially when the AC kicks in. Get a bottle of throttle body cleaner and be very careful cleaning out the back of the unit as it has some razor sharp edges. Reinstall and start the Trailblazer. Should be fine.

Posted on May 20, 2010

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Posted on Jan 02, 2017

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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...


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.

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good luck and keep me updated

wesleyschacht@hotmail.com

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