When accelerating there is a screeching noise?

2006 FORD F-150
124,000 MILES • 4.2L • 6 CYL • 2WD
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MICHAEL MANERCHIA
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Screeching noise when accelerate.
Jun 25, 2023 at 8:16 PM
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MATHGEN
  • Experienced Mechanic
  • 128 POSTS
Hello, the first thing that comes to mind is the serpentine belt. It's hard to say for sure without actually hearing it. Would it be possible for you to upload a recording of the noise?
Jun 25, 2023 at 10:05 PM
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MICHAEL MANERCHIA
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Took build off ran engine when accelerate still have noise also put new water pump on.
Jun 25, 2023 at 10:58 PM
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MATHGEN
  • Experienced Mechanic
  • 128 POSTS
Okay, thanks for the update. With the belt off, that eliminates any belt driven accessories. Do you hear any chirping type of noise at idle? I ask because the cam synchronizers have been known to make noise at higher mileage. But, even if there is no noise at idle, this could still be an issue.
Jun 25, 2023 at 11:58 PM
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MICHAEL MANERCHIA
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Yes, after it has warmed up comes and goes.
Jun 26, 2023 at 12:46 AM
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MICHAEL MANERCHIA
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Can I still drive it?
Jun 26, 2023 at 12:47 AM
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MATHGEN
  • Experienced Mechanic
  • 128 POSTS
Yes, but I would go ahead and replace the synchronizer assembly sooner rather than later. It's possible for it to seize up, although I have only seen that happen a couple of times. Now, there is a special tool that is used to time the synchronizer, but if you are very careful and mark the old and new parts with a paint pen you can do the job without the tool. It must be installed exactly as the old one. Just don't turn the engine with the synchro removed.
Mark the rotor to housing position and mark the housing to cover position. I wish I had a better picture, but I hope this helps.
Jun 26, 2023 at 3:25 AM
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MICHAEL MANERCHIA
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Thanks.
Jun 26, 2023 at 4:01 AM
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