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Need to know how to check injectors on a 6.2 gm diesel.?

Have a pick-up that barely passed emmissions I know the fuel and air filters are good(just replaced) So it leads me to believe I have a leaky injector. Do I perform a regular crack test(breaking each line loose from every injector seperatly of course) or from the injection pump?

4 Answers

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  • 1 decade ago
    Favorite Answer

    break the lines lose at the injector and see if it misses. but if this thing has a lot of miles, could be the injection pump. i'd losen the line at the injector and see if the sound of engine changes sound. if not , get the pump and all the injectors checked out. something else, you might need the valves set.

  • jeff s
    Lv 5
    1 decade ago

    Yeh, it sounds like the truck is getting too much fuel. There is also a pressure regulator valve (I think). If it was me....I'd replace all of the injectors and the regulator valve because I'm sure this engine is due. Good luck.

  • 1 decade ago

    before doing anything take a sample of your fuel in a clear, clean jar and look at it. i bet your fuel look a bright orange color(grade 3 diesel). this engine was designed to run on grade 1(blueish) or grade 2(slightly blueish). if you like additional info holler.

    Source(s): 22 years working on this dang motor in the military and civilian worlds
  • mark t
    Lv 7
    1 decade ago

    The best way to check them is on a test stand, where you can see the spray pattern and observe when they pop.

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