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Old 12-21-2013, 10:42 AM
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Turbo making nasty squeal. Please help

When it starts to build boost it's making this high pitch squeal like a bad bearing would sound like. And does it for about 10-20 seconds then fades to a normal turbo spool. To best describe the sound, it sounds like a squeaky belt on an old Oldsmobile. I'm only guessing it's the top turbo since it only does it when it builds boost. And on cold mornings I can hear the first turbo spool fine. The second one squeals.

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Old 12-21-2013, 03:12 PM
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I too have an issue with an odd squeal noise. Just started a couple weeks ago after a heavy cold snap. Comes on around 3k rpm while accelerating under load, no matter the temp. Cant verify that a specific turbo boost is causing it, or that its the turbo at all, only that its around 3k rpm and mid to upper boost levels. Sounds like its right in front of my steering wheel or radio.

Upon some research, i think it might be my fuel cooler/turbo actuator........low on coolant? I did recently have the coolant flushed.

Last edited by sanman28; 12-21-2013 at 03:35 PM.
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Old 12-21-2013, 04:18 PM
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My fuel cooler is acting up and missing a bolt on the side. And keep typing an open circuit code. But the sound is the same. I'm going to check my coolant level and do some research on that open bolt slot. That is very comforting hearing it may not be my turbo

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Old 12-21-2013, 04:49 PM
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I have the same exact symptoms, it does it does it once in a while where I will accelerate, or rev the engine and a real loud squealing starts, could it possibly be an idler pulley, I know mine squeaks just when idling...

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Old 12-21-2013, 05:02 PM
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Mine only does it under mild load. I have a pic of what I'm talking about missing bolt. Mine sounds like it's coming from the turbo cooler area. I did a break boost, to build some boost to get it to squeal, and my dad was under the hood. He said it sounds like it coming from the top back of the motor.

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Old 12-21-2013, 05:36 PM
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I'll bet you have a crack in the bellows of an up pipe.
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Old 12-21-2013, 06:03 PM
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Quote:
Originally Posted by dhanna6powerstroke View Post
I'll bet you have a crack in the bellows of an up pipe.
Ive thought this too......and it could be the issue.
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Old 12-21-2013, 06:05 PM
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How do I diagnose that? Soot of the back of the motor?

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Old 12-21-2013, 06:36 PM
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Google 6.4 turbo squeal and click on the first video. I'm assuming that is the noise you are hearing? For some reason I can't get the link to work.
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Old 12-21-2013, 06:54 PM
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Quote:
Originally Posted by dhanna6powerstroke View Post
Google 6.4 turbo squeal and click on the first video. I'm assuming that is the noise you are hearing? For some reason I can't get the link to work.
Not what im hearing. Mine is a whistle only at higher rpms under load. The tone of the whistle does not change, regardless of the rpm. Ill record it when i get back next week
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