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HIGH PITCHED SQUEEL???

3334 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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If my truck were making the noise you are describing under the desciption you provided I would focus my attention to all my CAC boots, and check them for proper fit, and torque. If need be removing them, cleaning any oily residue inside and out then reinstalling them.
Some oil in the CAC sytem is normal. CAC= charged air cooling.
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