Odd high pitched squealing...

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Apr 28, 2024 | 01:40 PM

#16

Motohead911

Laughing Gas

Joined: Aug 2018

Posts: 934

Likes: 248

From: CA

Quote:

Originally Posted by naviathan

I thought about that, but it doesn't sound like belt slippage. Plus, I replaced the tensioner last year.

Does it sound tea kettle'ish?

Apr 29, 2024 | 07:49 AM

#17

CASTMASTER

Cross-Country

Joined: Feb 2011

Posts: 75

Likes: 14

From: Chicago

I had the similar issue. It turned out to be a crack in the plastic CAC pipe.

Apr 29, 2024 | 07:55 AM

#18

Rusty Axlerod

Lead Driver

Joined: Feb 2011

Posts: 8,241

Likes: 155

From: L.A. (Lower Alabama)

Quote:

Originally Posted by CASTMASTER

I had the similar issue. It turned out to be a crack in the plastic CAC pipe.

Same here, sounded like air squealing out of a balloon. Turned out to be small cracks between the corrugations on the bellows part of the lower CAC tube.

Apr 29, 2024 | 10:04 AM

#19

naviathan

Thread Starter

Cross-Country

Joined: Jul 2022

Posts: 57

Likes: 9

Quote:

Originally Posted by Motohead911

Does it sound tea kettle'ish?

Kind of, yeah.

Quote:

Originally Posted by CASTMASTER

I had the similar issue. It turned out to be a crack in the plastic CAC pipe.

Quote:

Originally Posted by Rusty Axlerod

Same here, sounded like air squealing out of a balloon. Turned out to be small cracks between the corrugations on the bellows part of the lower CAC tube.

This is what I'm thinking it is. It didn't start happening until after I had fixed the harness from the squirrels that used my engine compartment as a nursery. I'm thinking it's either the charged side or the intake side being brought under heavy vacuum when the turbo is spinning up. I need to pull it all apart again and see if it's something obvious or just get new boots as they're all original and probably need replaced anyway.

May 2, 2024 | 01:33 PM

#20

naviathan

Thread Starter

Cross-Country

Joined: Jul 2022

Posts: 57

Likes: 9

Any recommendations on where to get the boots? I'm looking for the CAC side and the intake side.

May 2, 2024 | 01:47 PM

#21

CASTMASTER

Cross-Country

Joined: Feb 2011

Posts: 75

Likes: 14

From: Chicago

Make sure you check plastic CAC tube for cracks. I recommend Riffraff Diesel. Good quality great prices compared to O.E.M.

https://www.riffraffdiesel.com/

May 2, 2024 | 01:52 PM

#22

naviathan

Thread Starter

Cross-Country

Joined: Jul 2022

Posts: 57

Likes: 9

One of the CAC tubes is plastic? All mine are metal...I thought...I don't remember pulling a plastic tube on that side of the turbo.

May 4, 2024 | 07:27 PM

#23

Rusty Axlerod

Lead Driver

Joined: Feb 2011

Posts: 8,241

Likes: 155

From: L.A. (Lower Alabama)

Yer right. My ‘06 was plastic on the driver side. 2003 pipes (metal) was the fix.

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May 5, 2024 | 07:35 AM

#24

Baylinerchuck

Cargo Master

Joined: Dec 2021

Posts: 2,388

Likes: 996

From: Chambersburg, PA

Quote:

Originally Posted by bismic

The cap vents around 15-16 psi. If you reach that pressure, then the sound you hear is likely to be the cap venting pressure. Most likely source of this (if you have it) is a leaking head gasket.

It’s very likely if your degas bottle cap is venting you’ll have coolant residue under the hood. This is also a good tell tale. Check the exhaust bellows as well. These are prone to crack. The tell tale for this is carbon/ soot on the bellow itself or on the firewall behind the engine. In some cases, cracked up pipes can cause a squeal at higher RPM.

May 5, 2024 | 07:37 AM

#25

bismic

Fleet Owner

Joined: Nov 2003

Posts: 27,916

Likes: 3,635

That is the reason for the pressure gauge suggestion.

May 5, 2024 | 07:42 AM

#26

Baylinerchuck

Cargo Master

Joined: Dec 2021

Posts: 2,388

Likes: 996

From: Chambersburg, PA

Quote:

Originally Posted by bismic

That is the reason for the pressure gauge suggestion.

And an excellent suggestion it is.

May 5, 2024 | 12:04 PM

#27

naviathan

Thread Starter

Cross-Country

Joined: Jul 2022

Posts: 57

Likes: 9

It did it all the way into town yesterday. I stopped in a parking lot, shifted the intake boot around and it hasn't done it since. I've got a new intake boot on order.