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Underbody braces, turbos and more!

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PostPosted: Sun Apr 03, 2016 4:10 pm 
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Location: Lowell, MA
Here is a video of the sound:

https://youtu.be/ewYzou0chWY

It does not change with any of the HVAC controls. Changes with RPM and sounds like a metal on metal. I have stuck my hand where I can but haven't been able to change the sound at all. I cannot hear it from the engine bay.

Anyone experience this nerve-wrenching sound?

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PostPosted: Sun Apr 03, 2016 7:47 pm 
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When you made the recording was the engine running at one steady rpm?

Were you stationary or moving?

Initial guesses without knowing the answers us a loose exhaust front pipe flange bolts under your floorboards, or a loose hood hinge , or if your blower fan was running, some debris in the blades.


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PostPosted: Sun Apr 03, 2016 9:47 pm 
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suzukitom wrote:
When you made the recording was the engine running at one steady rpm?

Were you stationary or moving?

Initial guesses without knowing the answers us a loose exhaust front pipe flange bolts under your floorboards, or a loose hood hinge , or if your blower fan was running, some debris in the blades.


Video was at idle, stationary. It kind of sounds like a chipmunk that won't stop chirping. I recently redid my entire exhaust in that area and it didn't change the sounds so it can't be that. Blower wasn't running, but when I turn it on there is no change. It is loudest on decel. It really sounds like there's a loose ring rattling around a shaft.

I might take it to a place with a lift so I can poke around under the car a little easier tomorrow.

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PostPosted: Sun Apr 03, 2016 11:12 pm 
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The only other thing I can think of are a bolt working loose on some rotating part like a pulley, or a nut or rock loose inside a cavity like the bellhousing and being knocked around by the flywheel.


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PostPosted: Mon Apr 04, 2016 3:40 pm 
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Check the center engine mount on the firewall.. There are supposed to be 2 large round rubber disks on either side of the mount.. I wonder if they are missing..

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PostPosted: Mon Apr 04, 2016 9:17 pm 
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TheINCRide wrote:
Check the center engine mount on the firewall.. There are supposed to be 2 large round rubber disks on either side of the mount.. I wonder if they are missing..


Good Call Bren... that's exactly what came to mind.

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PostPosted: Mon Apr 04, 2016 10:51 pm 
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PostPosted: Mon Apr 04, 2016 10:58 pm 
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Hmm..

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PostPosted: Tue Apr 05, 2016 7:56 am 
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TheINCRide wrote:
Check the center engine mount on the firewall.. There are supposed to be 2 large round rubber disks on either side of the mount.. I wonder if they are missing..


This is the type of juicy tidbit I was looking for. I will check it out.

The boob / post ratio is strong in this one. Carry on.

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