| Loud noise, no power
I have had this intermintent problem since truck was new. GMC Dealer doesn't know what's wrong, says "no codes". Engine will be running fine, then just sounding very loud (like turbo turned off and engine tring to keep up, loss of power, no change in RPM. Happens whether I'm towing 5th wheel or unloaded. Hot or cold.
Mileage goes down. This doesn't happen all the time, but a real shocker when towing uphill. Changed fuel filter at 18,000 miles and last week again, present mileage is 21,400.
Anyone have any thoughts?
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KowboyKen, 05 GMC Sierra 2500HD SLT, 6.6 Duramax w/ Alison. Crew Cab, Short Bed.
Last edited by KowboyKen : 05-25-2007 at 08:06 AM.
Reason: More info
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