High pitch squealing sound on acceleration ???? - Ford Powerstroke Diesel Forum

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post #1 of 16 Old 03-09-2012, 08:48 AM Thread Starter
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High pitch squealing sound on acceleration ????

When I accelerate my truck and the boost builds it starts a very high pitch squeal and when I let off the gas the squeal stops could it be a hose leaking or what please help thanks


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post #2 of 16 Old 03-09-2012, 09:37 AM
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I would check the boot at the turbo hot side check on the under side this is where it comes apart, check this YouTube he will show you the boot and tell you about it.
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post #3 of 16 Old 03-09-2012, 03:08 PM
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A high pitch squeal could be several things. A boost leak can be hard to find if its small. I like to use soapy water in a spray bottle to help locate boost leaks. Spray, power brake, inspect repeat. In my experience a boost leak is more of a "swoosh" noise and not a squeal. I would suspect a possible turbine bearing. Pull the intake boot from the air filter side of the turbo and grab the turbine(cold and engine off please) push it in and out, up and down. There should be almost no movement! Another possibility is a turbo supply tube leak. Let engine cool down, start and get in there while things are still cool with your hand and feel around all the flanges and flex tubing. If there is a leak you will feel it. good luck
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post #4 of 16 Old 03-10-2012, 03:53 AM Thread Starter
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Thanks guys I'll try that this moring and see what I find


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post #5 of 16 Old 03-10-2012, 04:42 AM
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Depending on how long its doing it it could be your plate moving in the turbo.

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post #6 of 16 Old 03-10-2012, 04:58 AM Thread Starter
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I'm pretty sure it's the top boot it has several cracks on the inside and out but I've been thinking of taking the turbo off and cleaning it is there already a write up on here?


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post #7 of 16 Old 03-10-2012, 05:03 AM
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Ahh. Thats a good place to start then.

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post #8 of 16 Old 03-10-2012, 05:14 AM
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Here is a very good write up on turbo reconditioning from the Diesel Technician Society:
DTS Articles - Turbocharger Reconditioning

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post #9 of 16 Old 03-15-2012, 01:43 PM Thread Starter
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Ok I replaced the top hose from the turbo to the intercooler and it's still doing it I checked the turbo for play there is zero movement in it and it seems not to do it as bad when it's cold and it still starts around 11-12 pounds and it only gets up to around 22 pounds at WOT and I usually get 28 with my tune anymore ideas?


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post #10 of 16 Old 03-15-2012, 04:55 PM
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Quote:
Originally Posted by add2255 View Post
I'm pretty sure it's the top boot it has several cracks on the inside and out but I've been thinking of taking the turbo off and cleaning it is there already a write up on here?


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When u get the turbo off i would inspect the the Y-pipe, they are known to crack at the flex part, they also make a loud squeal when cracked.



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