Whistling Sound - What is it?

[2013megacab]

Driving today for the first time with the windows down, I heard a whistling/squealing sound. At first I thought it was a brake pad backing plate dragging on a disc, but when I took my foot off of the accelerator pedal the sound went away. I tried a few things and discovered that the sound happens when the accelerator pedal is under light pressure neither accelerating nor decelerating. Listening more closely I decided it really is a whistle, non-metallic, like a hole in a boot in the intake air system somewhere.

Any ideas where I should look?

Thanks,

Al

 

[Dasmoeturhead]

Check the turbo hose under the airbox. If the Airbox settles on that hose it chafs.

 

[SnoKing]

Should look like this. Hose at the turbo inlet should be clock'd CW. SnoKing

 

[Cummins12V98]

HA, I thought that was a pic I have posted several times until I saw that GAWD AWFUL BLUE oil filter.

Crystal Chrysler in Cathedral City, CA replaced mine under warranty.

Good reason to be a from the TOP kinda guy when changing oil filters.

 

[Cummins12V98]

I have checked mine since it's replacement and will do so this summer when changing oil filter. If it's chafing again I will place my old intercooler hose and clamp back over it.

 

[2013megacab]

Thanks everyone. I'll check that out.

Al

 

[Dasmoeturhead]

Check all the hose clamps on the entire system.

 

[gsbrockman]

I wonder if this might be the source of my problem? Guess I’ll be pulling my air filter housing tomorrow and investigate.

Since my truck is a 4500, I have never had to dismantle anything for routine oil filter changes as my oil filter is easily serviceable from below.

https://www.turbodieselregister.com/threads/unusual-squealing-noise-on-deceleration.268508/

 

[Cummins12V98]

I knew if I hadn't covered that boost pipe I would have been setting along I-5 somewhere on my trip South that year. So yea if it starts to make a hole that sure would cause a bit of noise!!!