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LS1 Squeaking

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Old Feb 12, 2022 | 09:55 AM
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Default LS1 Squeaking

Hey all,

My buddy’s Trans Am is chirping as the belt goes round. The belt itself seems fine. The squeaking didn’t stop when applying grease to it.

The squeak sounds like it’s coming from passenger side of the engine. I’m guessing tensioner pulley?

70k miles on the car. I’m wondering if there’s a common pulley that goes out first on the LS1.

Thanks!
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Old Feb 12, 2022 | 10:15 AM
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harmonic balancer ????
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Old Feb 12, 2022 | 10:30 AM
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Tensioner pulley. They have a tendency to go bad.
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Old Feb 12, 2022 | 11:05 AM
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Originally Posted by Pounder
harmonic balancer ????
I too would be looking at the harmonic balancer as they tend to go bad on the LS1. Check for wobble.
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Old Feb 12, 2022 | 12:13 PM
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Do a Google Search for "LS engine lifter squeaking". Plenty of videos to watch and listen to. Hopefully your friend doesn't have a bad lifter.
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Old Feb 21, 2022 | 05:59 PM
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Here’s a video my buddy sent me of the squeak. Does this help any of you narrow it down some more?
Attached Files
File Type: mov
IMG_1848.MOV (4.43 MB, 55 views)
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Old Feb 21, 2022 | 06:39 PM
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Sounds like mine, I'm going to replace the tensioner pulley and put in a new gatorback belt when it gets warmer out
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Old Feb 21, 2022 | 07:06 PM
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Originally Posted by MrMcE
Sounds like mine, I'm going to replace the tensioner pulley and put in a new gatorback belt when it gets warmer out
My buddy pulled his belt off and started spinning pulleys. Sounds like it’s his alternator pulley.
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Old Feb 22, 2022 | 02:19 PM
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My tensioner pulley went bad at 90,000.
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Old Feb 22, 2022 | 02:30 PM
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There is absolutely no way anyone can help you with some minor diagnostics. Belt squeals are difficult to diagnose and it can be almost 12-15 different things.

You have to start trying to narrow it down. I would recommend first taking off the AC belt and see if the squeal is still there. If so, then take off serpentine belt and see if it goes away.

i wouldn’t add “grease” to the belts. You want to get yourself a squirt bottle of water and spray each belt or pulley and see if the noise changes.

9 pulleys, 2 belts…..gotta try and narrow it down.
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