Question about 2004 Chevrolet Monte Carlo

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The car wont start when the engine get to opperating temp

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  • jferry2020 May 26, 2011

    could u please tell me where the ect sensor is located

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  • Chevrolet Master
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Hello
This car is controlled by a computer called the PCM (Powertrain Control Module) and whenever you have a problem like this the VERY first thing that must be done is to scan the PCM to check for fault codes that will indicate what part of the system is causing the fault and no start. The diagnostic connector to do the test is under the dash panel in front of the steering wheel, the tool needed to run the test is called an OBD 2 fault code reader, you just plug it in and press start, the tool reads the codes and delivers the results to you in the form of a letter and 4 numbers, there are about 200 of these codes. You can buy a basic scanner on Ebay for about $20.00.

Posted on May 26, 2011

  • 1 more comment 
  • yadayada
    yadayada May 26, 2011

    The ECT is located next to the thermostat housing, the thermostat housing is where the top radiator hose connects to the engine.

  • yadayada
    yadayada May 26, 2011

    One other question, if you spray starting fluid into the intake of the engine does it start?

  • yadayada
    yadayada May 27, 2011

    To help you ID the engine coolant temperature sensor below you will find a picture of the electrical connector to the ECT sensor.




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  • Chevrolet Master
  • 17,970 Answers

Sound like a problem with the ECT (Engine Coolant Temperature) sensor; it could be a broken wire, a bad sensor, a disconnected wire connector or a bad gage on the dash. You could have someone with a class 2 scanner do a test on the system and sweep the gages to find out for sure. Or you can inspect the wiring or even replace the sending unit if you want. The big problem would be if the dash unit was bad, then you would need a rebuilt instrument cluster as they are not replaceable individually.

Check it and keep us updated.

Posted on May 26, 2011

  • ZJ Limited
    ZJ Limited May 26, 2011

    Click over image for zoom...





    Fig. Removing and installing ECT sensor - 3.8L engine


    Replacement components must be the correct part number for the
    application. Components requiring the use of the thread locking
    compound, lubricants, corrosion inhibitors, or sealants are identified
    in the service procedure. Some replacement components may come with
    these coatings already applied. Do not use these coatings on components
    unless specified. These coatings can affect the final torque, which may
    affect the operation of the component. Use the correct torque
    specification when installing components in order to avoid damage.

    Good luck.

    Fig. Removing and installing ECT sensor - 3.8L engine

    Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

    Good luck.

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