Ear-splitting squeal at idle
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Senior User
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Ear-splitting squeal at idle
Ok, so first issue I've had with my truck here and my friend that has an 04 is telling me that he thinks it's the turbo. When the truck warms up a little and idles it has the loudest squeal I've ever heard in my life, like a tea kettle inside my ear type thing. Almost sounds like a bad bearing or something. It makes the noise at idle sometimes and other times, real light acceleration. Once you take off it goes away. What has me curious is that it goes away once the isn't idling/low rpms and I don't have a loss in boost, still running close to 30lbs under load. I have 54k on the truck and it's still under warranty, going into the shop next week. I described the sound to them and they said turbo almost without me finishing. Would that make sense that it would still boost with a toasted bearing?
Fleet Mechanic
Joined: Oct 2006
Posts: 1,351
Likes: 242
From: North Florida
Check the tensioner. Not the pulleys, but the spring part of the tensioner. Mine froze up and had some of the same symptoms. It held the belt tight enough that it looked ok, but any extra load, like the ac turning on, would make the belt squeal until it cought up.
Lead Driver
Joined: Dec 2006
Posts: 7,092
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From: San Diego, CA
Another voted for something in the accessory belt area. Possible a frozen idler arm or bad pulley, maybe even a bad bearing in an accessory. But with it only at low RPMs It sounds more like it would be an idler arm issue. Does the belt look in good shape?
Tell your friend that if he thinks it's the turbo then he should buy you one and if it fixes the problem then you will reimburse him for it. 
Just my .02
Just my .02
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Senior User
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I'll have to check the belt, as far as I know it's original. Tensioner I can check pretty easy, I'd be surprised because it's so loud.
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Former Vendor
Joined: Mar 2009
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From: Westford, MA
If the belts slipping it'll be really loud.
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Lead Driver
Joined: Dec 2006
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From: San Diego, CA
) and the tensioner gave out on each one. As long as it's in the budget, I replace the tensioner when I replace a belt.An ounce of prevention is worth a pound of cure...
Elder User
Joined: Apr 2006
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From: Taylorsville, UT
I had this happen and it was the exhaust side hose of the turbo. One of the clamps had come loose and was allowing an air leak. I would only notice it when accelerating and would go away when I let off the peddle. It was very loud and sounds like what you are describing. I do not have a boost gauge so I cant tell you any symptoms that may have shown. Just something for you to check.
Former Vendor
Joined: Mar 2009
Posts: 8,098
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From: Westford, MA
Glad you found the source of the issue.
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