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04 sierra

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by 5speedsilverado, Apr 4, 2009.

  1. 5speedsilverado

    5speedsilverado Epic Member 5+ Years 1000 Posts

    my friend has an 2004 sierra ext cab with 99080 miles on it, it has the 4.3 v6, and the check engine light is on, he has taken it to the dealer, and they said they couldn't find a problem with it. does anyone have any ideas??


    also what should the operating temp be for the 4.3, it looks to me to be running cold compared to my 4.8
  2. 5speedsilverado

    5speedsilverado Epic Member 5+ Years 1000 Posts

    any one have any ideas, he has to take his truck into emissions, and they wont pass him if the check engine light is on
  3. dwill3015

    dwill3015 Epic Member 5+ Years ROTM Winner 1000 Posts

    The check engine light means it is giving a code to what the problem is. Any idea what the code might be? If it is still happening, take to an auto parts store that will read the codes for free and then tell you what is wrong so without knowing what code it is throwing, it could be hundreds of different things.
  4. 04sierracrewcab

    04sierracrewcab Epic Member 5+ Years 1000 Posts

    x2 and that is lame on the dealers part.
    :neutral:
  5. 5speedsilverado

    5speedsilverado Epic Member 5+ Years 1000 Posts

    we haven't had a chance to do that yet, also does any anyone know about the op operating temp??
  6. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    First off avoid this dealer for future visits, if they cant figure out a code for this problem with a check eng light on they have major problems in the maintenance department.
    As mentioned most autoparts stores check codes for free (cause if they sell the part hopefully you'll buy it from them).
    On most vehicles the water temperature runs in the 180/190 deg range.
    If this truck is for some reason running much cooler that could be the cause of the check eng light.
    Unless the thermostat was stuck wide open or had been changed to a colder temp there arent many other reasons an engine would run cooler. It's just not a problem that happens a lot.

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