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Old 08-08-2018, 07:15 PM   #15
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The loud noise is there when the exhaust break is turned off
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Old 08-08-2018, 09:30 PM   #16
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Originally Posted by GaryandAnna View Post
The loud noise is there when the exhaust break is turned off
I surely thank you for answering my questions to narrow your issue down. Now, since you have a LOW and a HIGH, you DO NOT have an exhaust brake. You have a compression brake. There no "Low and High" on any regular exhaust brake. It's on, or it's off, period. Now, you say your noise ceases when the switch for the compression brake is OFF, correct? Hmmmm. So, I don't know if you've done this type of test or not but, if you're descending in speed or, descending a grade and have the compression brake ON, and you're compression brake is doing its job, then, in the middle of that slowing down, switch that switch OFF and see what happens.

Because, your compression brake is using engine compression to slow you down. And a compression brake, when activated, will never be any louder than what your engine sounds like during normal acceleration. You see, it's all going through the same muffler. So, the muffler silences ANYTHING that goes through it. So, what I'm saying is, if you were to have a bad muffler and it's not silencing like it used to, it would be LOUD on acceleration and, during compression braking.

So, I think we should be able to rule the muffler out of this issue.
Scott
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Old 08-08-2018, 09:38 PM   #17
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8.3 or an ISC never came with an engine brake and an exhaust brake is on or off. I don't think CC ever used a trans retarder either. Could they have used one of the electro-mechanical ones?
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Old 08-08-2018, 11:59 PM   #18
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8.3 or an ISC never came with an engine brake and an exhaust brake is on or off. I don't think CC ever used a trans retarder either. Could they have used one of the electro-mechanical ones?
Mr_D,
I don't know enough about the Cummins and or, it's sizes or designations to say one way or the other about what models came with what. But, all I can go by is the OP says he's got a "Low & Hi" on his auxiliary brake switch. Since there is no low and hi on any form of EXHAUST brake, as you agree, then it must be either a Jake or, maybe some form of a transmission retarder. I don't know those coaches or, how they were built and/or the chassis under them to make anything other than a guessing comment.
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Old 08-09-2018, 04:51 AM   #19
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I really appreciate you delving into this one. I actually did descend a mountain grade in Colorado yesterday with the exhaust brake on and then off and it was quiet during the entire decent, BUT here’s the key...I was only going 35 -40 max. As soon as got back into the flat lands and resumed speeds to 60-70 then it became loud when releasing the gas pedal. As far as the compression vs exhaust, all I know is that I have a switch that has two speeds and when I activate either one I get a red light on the dash that says EXHAUST.
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Old 08-09-2018, 05:43 AM   #20
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Exhaust manifold stud/s broke is what I am going to say. If it is a 300 hp ISC Cummins, it has a exhaust brake.........Compression brake's came on the ISL 400 and up......
Is it like a loud ticking noise when on the throttle........
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Old 08-09-2018, 06:10 AM   #21
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Most of what I have read that you posted makes sense, but when I read something like;

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Originally Posted by FIRE UP View Post
Because, your compression brake is using engine compression to slow you down. And a compression brake, when activated, will never be any louder than what your engine sounds like during normal acceleration. You see, it's all going through the same muffler. So, the muffler silences ANYTHING that goes through it. So, what I'm saying is, if you were to have a bad muffler and it's not silencing like it used to, it would be LOUD on acceleration and, during compression braking.
I start to wonder. I have never driven a vehicle with exhaust brake, but decades of working Cat, Cummins, or Mack with compression brakes I can promise that WFO, does not make near as much noise as riding the jakes, with or without muffler.
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Old 08-09-2018, 03:18 PM   #22
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Some newer coaches have turbo exhaust brakes and they have a “hi and low”. The op is correct he does have a exhaust brake. Country coach made some coaches with hi and low exhaust brakes. Something to do with the cruise control feature. I found this thread Click image for larger version

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Old 08-10-2018, 05:40 PM   #23
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I wanted to update everyone that offered some help on the loud lnoise on my 1995 Country Coach Intrigue. Found out today that it was not exhaust or muffler problem. It was a bad universal joint. It was sure driving me crazy on what it could me. Thanks again to all that responded.
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Old 08-10-2018, 06:17 PM   #24
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I wanted to update everyone that offered some help on the loud lnoise on my 1995 Country Coach Intrigue. Found out today that it was not exhaust or muffler problem. It was a bad universal joint. It was sure driving me crazy on what it could me. Thanks again to all that responded.
Glad you got to the root of your problem Gary, thank you for the update safe travels to ya!
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