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HIGH PITCHED SQUEEL???

3325 Views 14 Replies 9 Participants Last post by  bersa45, 
I
Well here's the problem when i'm loaded up 10.5 camper, pulling 18ft trailer loaded approx. 6000lbs pulling a long grade and the pyro temps get around 725 and up but never exceeding 850-875 i get this very high pitched squeel.Back off the throttle it dies down put your foot back in it comes back up.Once you crest the hill and cruise for a mile or two and the pyro temps come back down 550-600 approx.noise goes away.It seems you've got to be into the hill for a couple of miles and the temps over 725 for a bit before the squell comes on,while doing this though there's no loss of power truck pulls real strong,what do you think??(TURBO ON THE WAY OUT??)
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B
There is TSB 05-21-9 Whine/Whistle Noise 6.0L dated 10/12/05

Basically this is for the EGR cooler leaking at the exhaust Y-pipe or the EGR connection to the intake manifold. Will occur during periods of high exhaust back pressure if leaking at one or both of the joints.

Doesn't say anything about having to be under heavy load though.

Bob
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