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  1. 08 Envoy; Can't locate ECT Sensor

    OEM Issues
    Hi All, I am new to the forum and I am making my very first post! I have a 2008 GMC Envoy with the 4.2L I6 engine. I recently began noticing my temperature gauge intemittently not working. Some days it would display the correct temperature and then some days nothing. Then last week I got a check...
  2. Changed thermostat and now getting worse gas mileage

    General
    I changed my thermostat last week and the replacement went well. Anyways the truck started up fine and then died after about 30 seconds and then wouldnt start back up for about a half an hour. Well it finally started and has been running really well with the exceptions of getting worse gas...
  3. How to Replace ECT Sensor and Thermostat 2004 Trailblazer 4.2

    Engine Tunes/Mods
    First this is my first post, please forgive me if I use laymen terms whereas I am not a mechanic. I got a DOCII P0128 Error 2 weeks ago, it cleared and re-popped about a week later. For a 2004 Trailblazer 4.2 this code points to temperature problems related to the thermostat or ECT (Engine...
  4. Codes...aren't they supposed to be in Games?

    General
    -------------------------------------------------------------------------------- I replaced my ECT (electronic coolant Sensor) after reading my code that it was bad. Two weeks later the engine light came back on and read the same Code.... I checked my other sensor plugs and added electrical...
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