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Old 07-07-2012, 04:20 AM   #1
11RS
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Drives: 2011 2LT/RS GCO
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*Video* HELP! Noise over 100 KM/H!

Hi guys,

I have this weird, really loud crackling noise, almost like millions of rocks hitting the floor pan. Instantly it happens, from 80 and up, if I keep it under that I don't hear it what so ever.

I have a video of it, you can hear it over the road noise a bit, it just sounds like rocks hitting the bottom but I assure you it's not.

Does anyone else have this noise or know what it could be? TSB?

This car is nothing but trouble, there are 2 other noises I am trying to find too. This one I just can't live with though.
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Last edited by 11RS; 07-07-2012 at 06:28 AM.
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Old 07-07-2012, 04:23 AM   #2
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Oil leak getting on exhaust and burning mayne?
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Old 07-07-2012, 04:28 AM   #3
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Something loose between floor pan and exhaust pipes?
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Old 08-20-2012, 08:47 AM   #4
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Check your rear diffuser for pebbles or small debris. I had that same sound that only happened at 60 Mph and above. Sound was coming from behind me. Drove me crazy. Took me forever to figure it out. Just walk around to the rear of the car then lightly bang on the black rear diffuser enough to make it vibrate (which is what happens at highway speeds). If you hear the rattling, you've got debris from the road caught on the underside of the diffuser. You'll have to reach up under to get to the back side of it to feel around and remove the pebbles or debris. Good luck. Cheers.
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