Question about 1997 Chevrolet Tahoe

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Cyl 1 misfire

We have changed everything you can think of and it still tells us misfire any clue ? there is plenty of compression, fire.. hum?

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  • kjm_ccrm May 24, 2009

    pluggs, wires, dis cap, button, pickup modular assembly, fule injection cleaner and it's still only only running on 7 cyl with an error on cyl 1 ? any thoughts? fule delevery?



    Thanks KaseyJane

  • Keith Heavilin
    Keith Heavilin May 11, 2010

    Can you give me the list of what you have changed so we can try to figure it out and not recap.  Thanks.

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Bad injector or bad coil for that clyinder, also carbon build up holding valves open so do a top engine clean and see if that cures it.

Posted on May 24, 2009

  • Bruce Hathcock May 25, 2009

    Try lucas gas treatment it will soften up carbon and blow it out without hurting anything add one bottle to a tank of fuel add the lucas first them pump in the gas so it will mix well drive it for a half tank and see if it goes away,the misfire can be caused by carbon buildup around the valves even with good compresson and also can be caused by the digital egr valave sticking with carbon, it's a $6.50 fix from schucks or autozone or nappa auto parts store, if that does not do it then you need to buy the GM top engine cleaner and write me back for instructions for doing a top engine clean to get rid of the misfire.

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