Quote:
Originally Posted by pmarine
Hi everyone
I have a 2005 GMC C7500 with a 7.8L duramax. It's loosing power missing and smoking black. I took it to the mechanic and he made me change the fuel filter,fuel rail and it still works bad.Can someone please advise me what to do or check. Thanks
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Hello & welcome. This is the General Diesel area of this forum and there are some very sharp ppl here re MD & HD trucks and non Ford engines. Since your 7.8l is an inline six in a MD truck, I'm not sure you will get much info on the Duramax pickup truck sites mentioned above, but give it a shot. Maybe Birken or Gone Fishin' will chime in. Sounds like a fuel issue to me but I have no experience with that engine....is it throwing any codes?
Good luck!
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