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Old 09-14-2023, 12:33 PM   #1
stefan_
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Member#: 193330
Join Date: Nov 2008
Chapter/Region: W. Canada
Location: Canada
Vehicle:
10 STI
K1X

Default GR STI impossible to diagnose driveline squeak

Hi all--sorry to drop a "help!" message but I am losing my mind. I have a chirp or squeak somewhere along the drivetrain. It's a mechanical, short, loud chirp that I cannot track down. This is a completely stock (I know) STI with 85,000km--lots of rust underneath.

Observations:

- I can't replicate it on jack stands
- I get the squeak when setting off, and when crossing 3krpm. It also squeaks when coming down, falling below 3krpm--almost like it is torque related
- There is no clunk, lurch, NVH, or performance impact noticed
- Can't feel it through the wheel
- Can't hear it inside the car, only outside
- Does not appear to be related to boost
- It doesn't trigger on suspension compression
- It's not end links or sway bar bushings--sounded like endlinks to me so I replaced them with no improvement
- Changed all trans/diff fluids with no improvement

WHAT is this thing? It's incredibly annoying. Anyone had this before and can end my suffering?

In this video below I'm just stabbing throttle to go above then drop below 3krpm to get the squeak on / squeak off.
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Old 09-15-2023, 06:13 AM   #2
arse_sidewards
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Can you try rolling the car down an incline, engine off and letting the clutch out like you're trying to push start it. Do it in both forward and reverse. See if you get the squeak.

If you get it that should at least isolate it to the bits that hold the drivetrain in the vehicle.

I assume by "squeak" you mean like the "worn out poly leaf spring bushing" sound.
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Old 09-15-2023, 06:13 AM   #3
arse_sidewards
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Can you try rolling the car down an incline, engine off and letting the clutch out like you're trying to push start it. Do it in both forward and reverse. See if you get the squeak.

If you get it that should at least isolate it to the bits that hold the drivetrain in the vehicle.

I assume by "squeak" you mean like the "worn out poly leaf spring bushing" sound.
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Old 09-15-2023, 11:58 PM   #4
stefan_
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Join Date: Nov 2008
Chapter/Region: W. Canada
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10 STI
K1X

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Good idea. Did that, it only chirps when engaging the transmission. So it's something in the diff or driveshaft
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Old 09-16-2023, 10:41 AM   #5
blurred
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Quote:
Originally Posted by stefan_ View Post
Good idea. Did that, it only chirps when engaging the transmission. So it's something in the diff or driveshaft
Or it's just an engine mount or pitch stop. Also could be top mount bracket etc...

Sent from my SM-S918W using Tapatalk
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Old 09-16-2023, 11:20 AM   #6
stefan_
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Join Date: Nov 2008
Chapter/Region: W. Canada
Location: Canada
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10 STI
K1X

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Pitch stop would be great, quick fix. But it doesn't sound like it's coming from the front. Hard to pin down. But it definitely has that sound like a worn out bushing.
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Old 09-23-2023, 11:04 AM   #7
stefan_
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Member#: 193330
Join Date: Nov 2008
Chapter/Region: W. Canada
Location: Canada
Vehicle:
10 STI
K1X

Default

Confirmed it's not the pitch stop. Is it possible for a diff to make this noise as torque increases? I think that's what I've narrowed it down to (or mounts somewhere around it, maybe driveshaft as well)
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