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2005 Chevrolet Trailblazer Question: mil light on missfire all rpm what trouble to look for other than plugs has 75k

 

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tellit, 4.2L 6 Cylinder, Victorville, CA, May 20, 2012, 14:30
 Rookie

no problems up to now

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  • Answer #1

    Merrimack Auto from Merrimack Auto Center LLC, May 21, 2012, 15:22
     Enthusiast

    Plug wires or boots open the hood at night or in the dark. Start the car and see if any spark is going out the side of the wires

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    tellit, May 22, 2012, 02:00
     Rookie

    Thanks, but this engine has the coils on top of plugs no plug wires.

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    Merrimack Auto, May 22, 2012, 05:40
     Enthusiast

    yes they are also called boots. If you ck each one and make sure there are no "hot spots" or burn marks on the boot. you will not be able to see them arc

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