Question about 1997 GMC Jimmy

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Changed plugs wier roter and cap still number 3 plug misfires

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  • wildwillie_1 Jan 18, 2009

    fuel injector works compression good and no leaks

  • wildwillie_1 Jan 18, 2009

    every thing check out fine run good at higher rpms but number 3 misfires and servise eng light keeps flashing

  • yadayada
    yadayada May 11, 2010

    well u are missing something check it all again, pull the injector out and watch it spray.

  • yadayada
    yadayada May 11, 2010

    well u are missing something

    U pulled the injector and it sprays ok?

  • yadayada
    yadayada May 11, 2010

    does the fuel injector work? do u have acceptable compression on that cylinder, within 5% of the PSI readings of the other cylinders? any vacuum leak at the intake runner?

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Well i would double check the plug we all know these are a pain in the **** to put plugs in it possible that one got cracked. Also have you ever replaced the intake gaskets ? or any fuel in jection parts ? regulator or popets/injectors

Posted on Jan 18, 2009

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