Question about 2004 GMC Envoy

2 Answers

Car shutting off

Replaced battery and ever since car would turn off when you put on heat. Tried fuel injection cleaners and high octane gas. Was okay for about week and then problem resurfaced but now car is running rough and check engine light on also check engine light flashes when I am excelerating. Please help. Car no longer under warrantyMy battery died and had it replaced, after replacing the battery every time I would turn on the a/c and the car comes to a stop it shuts off. I was able to keep using it for a while then would no longer start. I had the alternator replaced even though it tested good 5 times, from what my understing is that it was the voltage regulator in the alternator. This has seem to help but still can't run the a/c, the rmp's drop and if the car is idle will die. I no loger have a warranty, any suggestions.

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  • Master
  • 564 Answers

Hi,
Check your blower resister in duct right in from of motor. These tend to burn out and short every once in a while

f its shut off when take you foot off padel to slow down , i recommand you to chechk the throttle body switch my the problem , because when take your foot off throttle body should not close its should open by 10% to allow more , check the chouk as well , does you car have wire padel or electric TB

 Envoy Shuts off when A/C is turned oncould try this,clean the throttle body bore.here is a bulletin showing you how.Engine Stalls When Air Conditioningcar shutting off - mag-glass_10x10.gif Is Turned On at Idle2004-2007 Buick Rainier2002-2007 Chevrolet Trailblazer and Trailblazer EXT
Engine may stall with the air-conditioner on and or while adding additional loads to the engine at idle. An example of an addition load would be turning the steering wheel left or right with the air-conditioning on. This type of stall usually occurs during idle or slow parking lot maneuvers. This concern may not set any diagnostic trouble codes.
Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM top engine cleaner, GM P/N 1052626 (Canadian P/N 993026) or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product. this should help

Posted on Mar 04, 2009

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  • Master
  • 5,158 Answers

Sounds like the alternator has quit... if you live in the states go to autozone and have them scan the codes... it's free

Posted on Mar 04, 2009

  • Roberta Smith
    Roberta Smith Mar 04, 2009

    quick test is to unhook the battery while it is running... if it keeps running... battery... if it dies... alternator... as it is running rough i would also check the coil pack... unhook one wire at a time.. does the motor idle change... if not plug it back in and move on to the next wire



    Robert

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