Well, I had to take my Trailblazer to the dealer to get it fixed. I was hoping I wouldn't have to, but alas the problems I had were beyond my (rather capable) technical abilities.
They told me the same thing -- the PCM needed to be reprogrammed after battery disconnection as it forgets how to idle properly. As I understand it, the PCM "learns" over time how to idle correctly for your vehicle and its environmental conditions. Once that memory is lost.
Also, after 120,000 miles, my throttle body/intake was so gummed up that the throttle body itself couldn't make the necessary fine adjustments to the idle speed to keep the engine running under A/C compressor load.
All in all, $100 for the PCM reprogramming and $200 for a full-blown fuel injector/throttle body cleanup (I called it priced it at an auto parts store to do the latter myself -- $200 for the kit).
Oh well! Better than a whole new A/C compressor (which is what I thought was wrong!)
Wednesday, September 26th, 2007 AT 11:43 AM