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Old 10-08-2008, 06:21 PM   #1
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Odd Noise. Motor Mounts? Shift Linkage? Front Shocks?

My 9-5 Aero has developed a slight noise in the front. Basically you can hear a slight thunk every time you let out the clutch and engage the drivetrain. It seemed like a general rattley suspension noise (albeit not a loud one) until I was able to correlate with application of load on the motor by letting the clutch out.

Also you can hear this in the cabin more than you can from outside the car. It's not a loud noise at all. Until I correlated it to the clutch action, it felt and sounded like a slightly loose front suspension.

My first suspicion was the subframe steering brace had come loose (I have one from the SC group buy awhile ago). But I got under the car there was absolutely no play at all when I tried to move it around.

The car has 130k on the clock, and the front shocks have never been replaced. The transmission was dropped and a Quaife LSD was installed at 118k.

I used to own a 9000 Turbo, so my first thoughts naturally were motor mounts.

I would appreciate any suggestions on this issue. TIA.
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Old 10-08-2008, 06:27 PM   #2
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A loose subframe bolt can make noise like that.

Even if there is no play that you can feel, it can still make sounds.

When I got my 9-3, one was 1/4 turn loose. Then I tightened it with a 4' bar. Then the noise went away
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Old 10-08-2008, 06:29 PM   #3
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I was going to say the same thing Palmer did. There is a lot of stuff under there that might "feel" tight to a person trying to wiggle it, but really could use a tiny bit of snugging up.
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Old 10-08-2008, 06:36 PM   #4
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That's helpful - obviously tightening the brace up is #1 on the to do list. Thanks.
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Old 10-08-2008, 07:08 PM   #5
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could be popping sway bar links?
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Old 10-09-2008, 03:35 AM   #6
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Intermediate steering shaft? I think if you hear it inside the car more, this could be a possibility.
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Old 10-12-2008, 09:02 PM   #7
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Well, progress has been made but not a complete solution. I ran down to Moonracer's place yesterday and the sway bar links were replaced. This was a big improvement, and definitely took a bunch of the light thunking away. Plus the car handled better.

But there is clearly some driveline lash noise remaining. I can hear it much more clearly now that the other noises are gone. It's not loud, and you can hear anything above 35 mph, but it's there. In fact, it's a bit of a double noise, a slight thunk followed immediately by another one.

(And Marty, it's not a turbo/BOV/air noise. I'm sure of that -- I'm much better at creating the noise now that I can hear it clearly).

I'm still thinking motor mount(s).
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Old 10-22-2008, 01:45 PM   #8
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I am 100% positive it's motor mount.
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Old 10-22-2008, 02:01 PM   #9
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Oddly enough, you know what I think it is - the front bumper cover has come loose where it attaches to the front of the wheel arches (on both sides). I think I'm getting some plastic thunks as it flexes when I start and stop.

But the sway bar links fixed 95%+ of what I was hearing. Car feels fine now, with just an occasional odd light thunk.
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Old 10-22-2008, 02:06 PM   #10
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Oh I see
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