2006 Hummer H2

2006 HUMMER H2
25,000 MILES • V8 • 4WD • AUTOMATIC
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PREM
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  • 5 POSTS
hi, ihave 2006 hummer h2 with 25000 miles.its running and idling rough for more than a year.dealer says there is no any code and everything is fine but its not.sometimes its runnig fine but only once in a while.sometimes when i start after few hours there is backfiring sound coming from inside the engine thats only once in a while.sometimes when idling in cold in the morning engine changing sound.it was running smooth when i bought it but it started idling rough suddenly.i cant figure out the problem.once i put in the park before coming to complete stop and grinding sound came out of the gearbox,i think this should not relate to the problem.can anybody help please thanks.
Nov 2, 2009 at 9:20 PM
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FACTORYJACK
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With as modern a vehicle as you have, if there was a running problem it should be able to give an indication. The grinding sound before a complete stop was the parking pawl ratcheting on the park gear. It looks like the vehicle should still be under warranty, if there is a problem, the dealer needs to identify it and correct it. Unfortunately, there is nothing that I am aware of that matches the symptom. Possible that the backfiring under the hood could be a result of low fuel pressure. If it were a constant condition, it should have some codes set. If it is intermittent, the dealer staff needs to make every attempt to duplicate.
Nov 4, 2009 at 9:43 PM
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