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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1670
Experience:  GM Grand Master Technician 2007. 14 year experience.
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I have a 2007 GMC Sierra 356.6 dsl turbo engine has 50

Customer Question

I have a 2007 GMC Sierra 35*****6.6 dsl turbo engine has 50 thousand miles on it awhile ago it started making a noise when I excellarate going up hill putting a load on the engine it doesn't seem to have gotten any worse but when the noise started it lost a little power .The best I can explain the sound I'm hearing is a whining whistling noise the more I step on the gas the louder it gets ive always worked on my own vehicles but this one has got me puzzled any help would be nice
Submitted: 1 month ago.
Category: GMC
Expert:  david carrier replied 1 month ago.

hi this is dave and im here to help with your problem.