Very high pitch squeal only at idle - Ford Powerstroke Diesel Forum
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Old 02-07-2014, 09:18 AM
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Very high pitch squeal only at idle

Truck is a 6.4L 08' with 107k miles, intake, exhaust, tune and dpf delete.

Current issue:

When I start the truck I have no audible noise and everything sounds good, then after warming up 3-5min I'll get a VERY loud squealing/tea kettle noise only at idle. Once I start driving it goes away and then starts back up after I stop and idling for a couple minutes.

Things I've tried:

Turning on the A/C compressor on/off and no change in pitch.
Spraying WD-40 on belt trensioner, no change.
spraying belt dressing on belts, no change.
spraying water on belts, no change.

Anyone have these symptoms and found a solution?
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Old 02-07-2014, 10:45 AM
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Sounds like it might be an up pipe leak. Is your boost down? Any soot on the firewall or around the bellows?
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Old 02-07-2014, 11:00 AM
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I second that!!!
My truck was doing the same thing and it turned out to be an up pipe leak due to a crack in one of the bellows (flex joints).
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Old 02-07-2014, 11:15 AM
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ill say exhaust leak for sure , more than likely an up-pipe
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Old 02-07-2014, 12:20 PM
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Also broken exhaust manifold bolts are fairly common. I had one when I switched to 6.0 manifolds.
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Old 02-07-2014, 12:52 PM
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I'd get a high pitched squeal from bent/misaligned tensioners. I've replaced several tensioners as well as a couple belts and my truck only has 60k miles on it. I know you've tried to eliminate the squeal with belt dressing and luring up the tensioners but how do your tensioners look?
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Old 02-08-2014, 07:19 AM
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Yeah I read it could be a flex pipe, so I'll have to grab a mirror and take a closer look. Didn't see any soot, but hopefully a closer look can confirm this.

The auto tensioner looks okay from what I can see although I know it can appear to be fine until removing it. I'd like to start with the easier/cheaper things and go from there.

Replacing up-pipe would require pulling the cab correct?

Last edited by cupa-joe; 02-08-2014 at 07:33 AM.
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Old 02-08-2014, 09:24 AM
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I know the up-pipe seems to come up when searching but the part that gets me is would'nt the squeal get worse with more exhaust flow? Also no noticable loss of power or more then normal turbo lag.

Last edited by cupa-joe; 02-08-2014 at 09:30 AM.
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Old 02-08-2014, 10:16 AM
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easy way to check if it is the belt is to remove it and start it up. if it squeals it's not the belts. it doesn't squeal it is something belt related, a pulley, bearing, the belt etc.
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Old 03-16-2014, 07:10 AM
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Okay, well I removed the belt and the squeal/whistle is still there and now seems to move with rpms from idle to 2k ish. Also noticed it goes once I start moving(underload).
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