engine brake noise - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax 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.

 
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post #1 of 4 (permalink) Old 09-05-2019, 07:30 AM Thread Starter
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engine brake noise

We regularly go up and down a steep mountain road. Our 2011 truck used to make no noise going downhill with the engine brake on, you could just feel it slowing the truck down. Now it makes a rumbling sound which appears to be coming from the top of the engine. If I turn the engine brake off no noise. I guess the turbo is the engine brake? Any ideas?
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post #2 of 4 (permalink) Old 09-05-2019, 12:49 PM
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Possibly a vanes stuck?

Do you have a monitor so you can see your vane position while driving and when Turbo Brake activates? If you do when it first activates vanes should go to 100% and then decrease til the truck downshifts then it goes back to 100% in the lower gear and repeats the process.

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post #3 of 4 (permalink) Old 12-15-2019, 08:01 AM Thread Starter
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Sorry for not getting back sooner. I have been real busy. It seems that it stays louder longer
the heaver the load. your info makes sense
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post #4 of 4 (permalink) Old 12-15-2019, 08:43 AM
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Quote:
Originally Posted by like11chev View Post
We regularly go up and down a steep mountain road. Our 2011 truck used to make no noise going downhill with the engine brake on, you could just feel it slowing the truck down. Now it makes a rumbling sound which appears to be coming from the top of the engine. If I turn the engine brake off no noise. I guess the turbo is the engine brake? Any ideas?
Turbo Brake. Turbo Vane actions use the engine compression to slow.
I would look for an exhaust leak, perhaps one of the bellows on one of the up pipes has cracked, or a problem with one of their gaskets leaking.

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