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Old 05-11-2008, 11:31 PM   #1 (permalink)
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Whining Noise?????????????????

I have a 2008 Duramax and I just got a new 5th Wheel trailer. Trailer weighs about 12,000 loaded and it is within my towing specs. The last couple of times I have pulled it over a mountain near my house, my engine or turbo makes a high pitched whining noise. It sounds to be directly associated with RPM's. When I let off the pedal the noise goes down and visa versa.

It happens when I've been pulling for awhile or just starting the trip, but only when pulling up a hill. Once I let up on the pedal and tried to slow down and the noise went away eventually.

I'm thinking it has something to do with the turbo or exhaust gas temp? Any ideas?

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Old 05-12-2008, 02:36 AM   #2 (permalink)
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Sounds like its the fan when the clutch kicking in that your`e hearing.
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Old 05-12-2008, 12:03 PM   #3 (permalink)
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I know that when I am towing up a mountain my turbo noise is much more pronounced and can easily be heard inside the cab.

This was the same for both my current and previous 6.5TD truck.

In fact while towing was the only time I could hear the Turbo inside the cab of my 6.5, it was quite a noisy engine in comparison.

What I can hear with my LMM sounds like a mix of a high pitched whistle and high pressure air just as you describe related to RPMs.

The noise on mine is not deafening or loud by any stretch but can definitely be heard inside.

Unless it is an excessive noise on your truck it sounds like it might be normal.

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Old 05-12-2008, 12:16 PM   #4 (permalink)
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RPM in any gear or one gear?

Some people early on reported very low fluid levels in rear ends, transfer cases, etc... I'd take a look there.

Mine doesn't do that and I tow about the same load toyhauler.
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Old 05-12-2008, 12:29 PM   #5 (permalink)
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Check to see it you have loose hoses on the turbo. I've seen several instances where a leak on the pressure side of the turbo presented as a whine.
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Old 05-12-2008, 12:57 PM   #6 (permalink)
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Old 05-14-2008, 12:51 AM   #7 (permalink)
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Old 05-14-2008, 08:31 PM   #8 (permalink)
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If you have the Allison in tow haul mode, that might be doing it also! That Allison whines when your pushing it due to the higher RPM's! Gears. That's my guess.
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Old 05-14-2008, 08:39 PM   #9 (permalink)
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Old 05-14-2008, 10:09 PM   #10 (permalink)
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Mine had a whine in it and like mentioned above it was a turbo hose clamp loose
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