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Author Topic: Help with Noise Diagnoisis - Drivetrain/Suspension?  (Read 1214 times)

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Offline Clutch

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Help with Noise Diagnoisis - Drivetrain/Suspension?
« on: October 20, 2014, 09:38:07 PM »
Hey All.

So I have an odd noise that Im not sure where to start looking.  Didnt know if anyone here has dealt with it, or if its a subie specific thing with a known cause...

Its a 2011 Impreza 2.5i, manual tranny.  When I first start to get moving in the morning, maybe the first 100 feet or so, I hear a noise that sounds like its from the passenger side.  Not sure if its front or rear, but it almost sounds like if you were running over a acorn or something that fell out of a tree.  I dont hear any other noise once Im moving, and it doesnt sound like its bad or scary, but if its something that I should get tweaked now, sooner is better than later.

It doesnt look like a CV boot or anything like that, so I just dont even know where to start looking.  Any ideas?

Offline 20 BLK WRX 04

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Re: Help with Noise Diagnoisis - Drivetrain/Suspension?
« Reply #1 on: October 20, 2014, 10:51:23 PM »
Hmmm, I'd check the exhaust. About a year ago I had a knocking noise that I couldn't put my finger on. It was nearly impossible to locate where the noise was coming from, especially because it happened at unpredictable intervals. It turned out that one of the spring bolts on the exhaust had loosened itself, and the exhaust was knocking up against the rear differential.
Mike

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Offline Kavik

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Re: Help with Noise Diagnoisis - Drivetrain/Suspension?
« Reply #2 on: October 21, 2014, 12:38:51 AM »
first hundred feet....hmmm.........is that the first time you have to touch your brakes? 
I'd check the pads and rotors, but also the e-brake assembly.  Mine was out of whack once and it'd make weird noises sometimes, especially after it had sat over night with the brake engaged. It'd go away once the rotors were warmed up, and not come back until it sat for a while again
-Daryl (Albany)                                                                                   ಠ_ಠ
['14 Mazda3 SGT]     ['03 Sonic Yellow WRX Wagon]     ['05 WRB WRX Wagon]     ['02 PSM WRX Sedan]

Offline Clutch

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Re: Help with Noise Diagnoisis - Drivetrain/Suspension?
« Reply #3 on: October 21, 2014, 06:26:02 AM »
E-brake was my first thought too, thinking that one of the pads was hanging or something (especially since the car sat on a dealer lot for several months).  But it more and more is sounding like it comes from the front, so that was starting to get ruled out in my mind.

Ill check the exhaust, since Ive only been under the car once to do an oil change (didnt trust the dealer quick fill or the Pronto filter they put on it). 

And the noise happens without me touching my brakes at all, its usually when Im just leaving my driveway or the parking lot at work. 

Offline madlife

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Re: Help with Noise Diagnoisis - Drivetrain/Suspension?
« Reply #4 on: October 21, 2014, 02:47:05 PM »
Another good way to test it is to start driving,  when you hear the noise, slowly click the e-brake a few notches,  does it change?

Repeat process with brakes.  Press them slightly, and keep gassing it.  If its is the brakes, a lot of times it will go quiet when pressure is applied and everything is held tightly.  Also,  once you get going at some speed and/or things warm up you might not hear it.


first hundred feet....hmmm.........is that the first time you have to touch your brakes? 
I'd check the pads and rotors, but also the e-brake assembly.  Mine was out of whack once and it'd make weird noises sometimes, especially after it had sat over night with the brake engaged. It'd go away once the rotors were warmed up, and not come back until it sat for a while again

Offline Clutch

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Re: Help with Noise Diagnoisis - Drivetrain/Suspension?
« Reply #5 on: October 22, 2014, 07:25:35 PM »
I dont even have time to click the e-brake, since its not a recurring noise, just a one time event.  The single thunk/crunch/plonk, and thats it.  Doesnt happen again until the car is parked and I start to drive.  Im wondering if its just a universal/CV or some splines that are shifting?  Im still under powertrain warranty, but I dont know how easy it will be to get it to happen when Im at a dealer....

Offline Clutch

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Re: Help with Noise Diagnoisis - Drivetrain/Suspension?
« Reply #6 on: October 29, 2014, 01:09:53 PM »
I did try to yank the e-brake when going down the road, but only got a high pitched squeal.  It holds right now, but I wonder how much meat is on the e-brake shoes.... 

Definitely a clunk-thunk-crunch from the front end, passenger side.  I think the appropriate sequence is that I back the car up, and then its the first significant turn that I make after going forward.  Seems to be left or right.  My gut tells me thats some splines or a CV axle engaging, and as long as I keep going forward its all good, but the reversing screws it up again.  Ill need to get into a big parking lot to back up and make some turns to see if it happens every time, or only after the car is parked and shut off. 

Not looking forward to having to try and detail this to the service guy.

Offline deadlydave

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Re: Help with Noise Diagnoisis - Drivetrain/Suspension?
« Reply #7 on: October 29, 2014, 02:26:43 PM »
Could it be a partially seized brake caliper?  I know that i've had certain pads which will bind with the rotors a little, from just sitting overnight, and sort of 'break loose' in the morning as I move the car.

Offline Clutch

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Re: Help with Noise Diagnoisis - Drivetrain/Suspension?
« Reply #8 on: November 02, 2014, 02:52:08 PM »
It could be, honestly.  Car is still pretty new to me, and the rotors were replaced by the dealer that sold it (but strangely enough, I think they used the old pads....hacks) 

I need to get it inspected in NY, so Ill have the mechanic pull the wheel on that side for the brake check to see whats going on. 

Offline Clutch

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Re: Help with Noise Diagnoisis - Drivetrain/Suspension?
« Reply #9 on: November 06, 2014, 08:39:29 PM »
Ok, so I had the car checked out by my mechanic today, and everything looks good.  So I also did some more interneting, and it turns out that Im not the only one.

Consensus around the interwebs is that its actually a function of the ABS system, and its clunking like that when it hits a certain speed.  Makes sense to me since it seems to happen in the same spot every time, and doesnt change depending on the ebrake, if I back up or not first, etc.  So, I guess that means the mystery is solved!
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