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Go Back   Dodge Cummins Diesel Forum > 07.5 - 09 6.7 Liter Cummins > 07.5 - 09 3rd Gen 6.7L Powertrain
07.5 - 09 3rd Gen 6.7L Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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Old 11-08-2010, 08:08 PM   #1 (permalink)
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exhaust brake or turbo whistle under load

I was driving my 07.5 this past weekend. I had my slide-in camper in the bed and my jeep towing behind. WhenIpulled off the hi-way at our exit and let off the gas the exhaust brake kicked in and after a few moments of normal e.b. niose I heard a hi pitch whistle noise wich lasted until I came to a complete stop and then the niose quit and did not happen until the return trip home a few days latter. Does anyone know what this might be? E.B. problems or turbo problems?
Thanks Barrett
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Old 11-09-2010, 01:09 AM   #2 (permalink)
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Did the whistle sound just like the turbo sound under load? If so then it's normal, the exhaust brake slides the vanes and basically closes off the turbo, but the exhaust still has to get out. As a result, the turbo does spin up and generate boost while the EB is working. You should hear it 1-2 seconds after the EB engages. Sometimes it's hard to hear, it all depends on the sound conditions.

With your S&B intake I'm surprised you don't hear the turbo whistle every time the EB comes on.
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Old 11-09-2010, 07:07 PM   #3 (permalink)
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mine does this every now and again. Mine is not the normal boost pressure noise, it sounds like it is in the dashboard on the passenger side. it is a very loud sound like it builds too much pressure and then blows it all off at once. Dosen't sound like a normal sound. My local dealer put two turbos in and it still does it. Now they can't get it to do it again, but it still does it. I have 109,0000 on the clock, last turbo only has 3 to 4 thousand miles on it. I think that it only seams to do it during regen. I have a pyrometer so i can tell when the truck is in regen.
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