Question about 2001 GMC Yukon Denali

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Check engine light 2004 GMC Yukon

Local garage diagnosis misfiring .Changed all spark plugs and wires , still misfiring.The mechanic suggested a fuel injector cleaner, still nothing.Any suggestions

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  • PALMERTAMIJK Mar 03, 2009

    I RECENTLY GOT THE SAME MISFIRING DIAGNOSIS. WHAT COULD IT BE?

  • kevin carpenter May 11, 2010

    have you installed a scanner and looked to see what cyclinder is misfiring ? is it a random misfire? a vacuumn leak? let me know kdc744

  • Chris Hall
    Chris Hall May 11, 2010

    Did your local garage do a scan to read check engine light codes? If so, what codes came up?

  • Anonymous Mar 31, 2014

    check engine light staying on...vehicle was hooked up to a computer and I was told that the number one cylinder had over 40000 misfires...also when I reach speeds between 50 and 60 miles per hour...it feels like the transmission is sluggish this only happens between those speeds...I can shift the transmission to the # 3 postion and the slugginess stop ....any advice.

  • Anonymous Mar 31, 2014

    check engine light staying on...vehicle was hooked up to a computer and I was told that the number one cylinder had over 40000 misfires...also when I reach speeds between 50 and 60 miles per hour...it feels like the transmission is sluggish this only happens between those speeds...I can shift the transmission to the # 3 postion and the slugginess stop ....any advice....

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  • 3 Answers

When my check engine light went on, it was a oxygen sensor

Posted on Jan 15, 2009

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