Question about 2002 GMC Yukon XL

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PO305 Code on 2002 Yukon XL 5.3L

Already replaced the plugs and wires, checked each coil. Disconnected the battery cable to clear code but i comes ight bach. Engine runs rough at idle and service engine light flaches at speeds above 30.

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  • hmbg Mar 31, 2009

    mine turned out to be a cracked head, and I replaced the engine, rough idle, check engine code, misfire on #2, changed wire and coil, no help, checked compression, it was 70-75 on that side of engien, over 100 on the other side..236,565 miles on engine...had been running really great!!

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You probably have water in your fuel . Use some Stabil healthy dose and then some isopropyl alcohol gas line antifreeze that Will probably fix it . and fill it at a popular gas station , not a little station that only sells a little gas. Its either that or you might have a pluged cattalyitic converter. Try this site . http://www.obd-codes.com/forums/search.php?search_id=active_topics

Posted on Mar 09, 2009

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Posted on Jan 02, 2017

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