Low Frequency Resonance
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 765
Likes: 0
From: York Pa
Low Frequency Resonance
Before I end up taking it in for the dealership to try to resolve, I am wondering if what I am now currently experiencing is known to anybody. Today, for the first time, while heading down the freeway at a Cruise Controlled 68mph, I heard what sounds like a low frequency resonance coming from somewhere in the front of the interior. I thought it might be some cd cases I had under the arm rest ... I thought it might be a vibration from the center speaker ... I thought it might be an as-yet unknown problem with the roof ... I thought it might have something to do with the Mild-2-Wild controlled exhaust ... but by process of elimination it doesn't appear to be any of the above. Car is an '08 with just over 27K on the clock, and the resonance/vibration appeared for the first time about 20 miles into my trip. Wasn't constant throughout, and when I returned from my stop it again showed up and again disappeared. Happened a third time in the afternoon on a non-freeway surface but the constant seems to be the onset when reaching roughly 65-70 mph. Unless it has something to do with the speaker or something else vibrating in the dash, this is new to me. Anybody have anything like this with their C6? tks
Safety Car
Joined: Nov 2007
Posts: 4,436
Likes: 875
From: Bay Area CA
I had a wind vibration noise coming from the passenger side front dash near windshield. It was the cowl trim that would vibrate as wind would pass through at highway speeds. Apply blue tape over the cowl trim onto the windshield. Take it for a ride on the freeway, if the vibration went away the cowl trim needs to be replaced. Do a search on cowl trim vibration for more info.
Cruising
Joined: Aug 2011
Posts: 14
Likes: 0
After i swapped the exhaust from the stock, I can hear some resonance sounds at some low RPM, with 6 gear in and at speed at about 100 km/hmaybe..
I know the stock had some holes in it to prevent that, guess I have to live with it. The stock sounded to quiet.
I dont have borla or corsa, I have something called HMS..
Or is there a trick to prevent the low RPM sound?
Gear down and
I know the stock had some holes in it to prevent that, guess I have to live with it. The stock sounded to quiet.
I dont have borla or corsa, I have something called HMS..
Or is there a trick to prevent the low RPM sound?
Gear down and
Last edited by vetternity; Mar 8, 2012 at 02:32 AM.
Safety Car
Joined: Jan 2007
Posts: 4,295
Likes: 8
From: Issaquah WA
After i swapped the exhaust from the stock, I can hear some resonance sounds at some low RPM, with 6 gear in and at speed at about 100 km/hmaybe..
I know the stock had some holes in it to prevent that, guess I have to live with it. The stock sounded to quiet.
I dont have borla or corsa, I have something called HMS..
Or is there a trick to prevent the low RPM sound?
Gear down and
I know the stock had some holes in it to prevent that, guess I have to live with it. The stock sounded to quiet.
I dont have borla or corsa, I have something called HMS..
Or is there a trick to prevent the low RPM sound?
Gear down and
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 765
Likes: 0
From: York Pa
I had a wind vibration noise coming from the passenger side front dash near windshield. It was the cowl trim that would vibrate as wind would pass through at highway speeds. Apply blue tape over the cowl trim onto the windshield. Take it for a ride on the freeway, if the vibration went away the cowl trim needs to be replaced. Do a search on cowl trim vibration for more info.
Last edited by Y2K3CL-S; Mar 8, 2012 at 08:43 AM.
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Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 765
Likes: 0
From: York Pa
^ As the problem just reared it's head yesterday, I thought I'd ask the forum first before I went to the dealer. Sometimes its better to not only inform them of your problem, but to be able to show them the cause and relay the known fix. Your question does pose two questions that I did not find in the other thread:
1) Has there been a TSB issued regarding this issue
2) As it's out of warranty (51 month old '08 with just over 27K miles), I assume this will be an out-of-pocket fix for something that was well documented in the other thread ... which I see you (or someone else using the username) did have a couple of posts in
1) Has there been a TSB issued regarding this issue
2) As it's out of warranty (51 month old '08 with just over 27K miles), I assume this will be an out-of-pocket fix for something that was well documented in the other thread ... which I see you (or someone else using the username) did have a couple of posts in
Last edited by Y2K3CL-S; Mar 8, 2012 at 10:06 AM.
CF Senior Member
Joined: Feb 2006
Posts: 23,313
Likes: 25
From: Tucson Arizona
I'm just spitballing but when you're cruising at 65-70 mph what gear are you in? I wouldn't recommend using the over-drive gears (5th or 6th) at only 68 mph but if you are try putting the transmission into 4th gear to see what happens. 'Lugging' the engine could possibly create the annoying resonance somewhere in the car. It's just a thought...good luck.
