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Old 07-27-2010, 01:23 PM   #1
Edrock

 
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New rattle noise at 45 Mph and above...

Hi All,
Does anybody know what could be causing this noise or have experienced this yourself? First, the noise sounds like a leaf or paper caught in the air intake just outside the windshield where air is drawn into the car. In all my testing, I have eliminated the A/C by completely turning it off and the noise persists. Turned the radio completely off and it still happens. It almost sounds like it is not inside the cabin and in front of me around the center of the dash like just on the other side of the firewall or deep inside the dash somewhere. The first big clue is the fact that I can cruise above 45 Mph and can hear this object flapping in the wind like a leaf that's hanging on for life and won't let go. I can shift into neutral and coast above 45 Mph and hear it strong. As soon as I coast down to 44 Mph, the noise goes away. If I speed up above 45 Mph, here it comes again and loud. It does seem to be speed/wind related because the faster I go the back and forth ticking sound it makes gets faster. When I coast down to 45 Mph, the ticking sound slows down its cadence just before it stops. It's the most annoying sound and can be heard with music on and A/C on...that's how annoying it is and it's steady too. Anybody heard this or has my car developed a unique issue?
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Old 07-27-2010, 01:34 PM   #2
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Not to be condescending, but maybe a leaf or a piece of paper is caught in the intake or around the intake. You didn't say whether you checked that. Check the whole front bumper. You might only be able to hear it because 45 miles might be the exact speed required for that piece of paper to resonate - kind of like the drone you hear from aftermarket exhausts at certain rpms/speed. If it's a new sound, it's probably something stuck.
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Old 07-27-2010, 02:02 PM   #3
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Quote:
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Not to be condescending, but maybe a leaf or a piece of paper is caught in the intake or around the intake. You didn't say whether you checked that. Check the whole front bumper. You might only be able to hear it because 45 miles might be the exact speed required for that piece of paper to resonate - kind of like the drone you hear from aftermarket exhausts at certain rpms/speed. If it's a new sound, it's probably something stuck.
LOL, Good point...I failed to say what other things I looked for. I crawled up and around the front end of the car, thoroughly inspected the front grill and air dam on the lower fascia. I also tried to check the intake vents that feed the cabin just under the hood cowl but it was very hard to see in there. In all cases, no obstructions, trash, leaves, etc. I need to see if I can get inside that air intake where the pollen filter is located because it is probably time to change that anyway since I've had the car a year now. Any other suggestions?

EDIT: I also checked for objects rattling in the glove compartment and center console...nothing.
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Last edited by Edrock; 07-27-2010 at 02:16 PM.
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Old 07-27-2010, 02:32 PM   #4
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Maybe that air filter is ripped or has a tear in it? causing air to blow by it and cause that paper flapping sound?
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Old 07-27-2010, 03:03 PM   #5
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look for loose part number labels in the engine bay.
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Old 07-27-2010, 03:18 PM   #6
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look for loose part number labels in the engine bay.
Hey...that's a good idea. That's what it sounds like. I'll check tonight and post back.
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Old 07-28-2010, 07:43 AM   #7
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Actually forgot to check for flapping OEM labels in the engine bay last night, BUT, on the interstate this morning, the noise became loud for a second then when to a low level where I could barely hear it. I suspect whatever it was finally tore off leaving a smaller piece behind. When I got to work, I popped the hood and was surprised to find so many OEM labels all over the engine bay so I removed as many as I could reach. When I head out at lunch today, we'll see how it goes from there. Will update then.
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Old 07-28-2010, 10:48 AM   #8
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Edrock, I have the exact same noise, been having a heck of a time describing it, thanks for the Leaf analogy!! I'll look this weekend for a parts tag, that does seem a likely suspect.
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Old 07-28-2010, 11:44 AM   #9
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Edrock, I have the exact same noise, been having a heck of a time describing it, thanks for the Leaf analogy!! I'll look this weekend for a parts tag, that does seem a likely suspect.
Glad to know I'm not the only one. When I went home for lunch, the sound is still there above 45 Mph (just not as loud) even though I took the OEM tags off this morning that I could reach from the topside of the engine bay. Now I'm wondering if something really is lodged in the air intake vents under the cowl of the hood just below the wiper blades. I need to find some documentation about how to change the pollen filter in that location anyway so hopefully I'll find the smoking gun at that point. Good luck.
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Old 07-28-2010, 12:22 PM   #10
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This is where I'm headed next in case anybody is interested. Will post results when I get a chance to get in there and check it out.

Here's the thread: http://www.camaro5.com/forums/showthread.php?t=85122

Here are 2 important posts in that thread with clues on how to get in there:

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Old 07-29-2010, 09:52 AM   #11
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SAME EXACT PROBLEM HERE. It drives me crazy this sound. I've also been unable to describe the sound, thanks for the analogy. I will monitor this thread closely for a fix. I'll pray for one too, as I am the type of person that is highly annoyed by sounds like that. I can hear it over the radio too.
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Old 07-29-2010, 09:58 AM   #12
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I have the same problem as well and the picture above gives me hope that it indeed comes from the passenger side filter. I am going to the dealership right now and I'll report back folks.....
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Old 07-29-2010, 11:39 AM   #13
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Just got back. We removed the filter cover and filter and then cleaned everything in site in the box. Put everything back in and so far, so good! Easy job to do at home guys - 3 fasteners and the lid comes off quite easily. You'll notice the weather striping is intentionally cut to allow the lid to be removed.
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Old 07-29-2010, 11:56 AM   #14
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So did you find the debris? Was it a leaf or paper? Or did you not find anything specific and the noise just went away?
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Old 07-29-2010, 12:05 PM   #15
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So did you find the debris? Was it a leaf or paper? Or did you not find anything specific and the noise just went away?
We didn't find anything. The only thing I would tell you to check is the wireing harness that runs from the left side of the box to the back of the filter. It did have a platic tie wrap on it and so I just grabbed the harness and gave it a tug to make sure it wasn't lose.

I think it has more to do with how well the lid is on and more specifically, how well the lid has been snapped into place just under the windshield. Pull it off, clean it and then snap it back under the windshield. It might also be how the lid vibrates against the rest of the plastic cowl piece. If the sound comes back, I'll put some hockey tape between the two parts and see if that stops the vibrating.
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Old 07-29-2010, 12:12 PM   #16
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Check these areas:
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Old 07-29-2010, 02:37 PM   #17
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Check these areas:
Wow, this is encouraging. It just might be that wireing harness and/or tie wrap in there...or maybe just the fit of the cover. I have not had a chance to get in there. Will try after I get home later tonight (if I remember). I'll know if that was it because I can reproduce the noise on command and predict exactly what MPH you will start to hear the rattle/flapping vibration. Thanks Hylton and everyone else for your feedback! We're gonna get to the bottom of this yet!
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Old 07-29-2010, 02:40 PM   #18
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Wow, this is encouraging. It just might be that wireing harness and/or tie wrap in there...or maybe just the fit of the cover. I have not had a chance to get in there. Will try after I get home later tonight (if I remember). I'll know if that was it because I can reproduce the noise on command and predict exactly what MPH you will start to hear the rattle/flapping vibration. Thanks Hylton for your feedback!
No problem. Please report back because there have been a few reports of this and we want to be sure we have the cause/solution.
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Old 07-29-2010, 04:05 PM   #19
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Thanks for all the tips guys! I'll check mine out Sat, after I install a MGW shifter.
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Old 07-29-2010, 05:36 PM   #20
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More digging is required for me unfortunately. On my way home, I found an empty stretch and the noise came back at a steady 80mph. It is definitely wind related. Mine still sounds like it is coming from the same area or perhaps where the weelhouse meets the firewall.

My next step is to remove the lid completely and repeat the test to try and isolate. I'll report back tomorrow morning.
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Old 07-30-2010, 06:55 AM   #21
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OK, Again, I forgot about this last night (they say that's the 2nd thing to go y'know) but remembered on my way to work this morning. So in the parking lot, I popped the hood and removed the air filter cover as discussed before. There were no FOREIGN objects in there, even after romoving the filter. I did find the wireing harness that Hylton described before but the tie wrap was secure and practically out of sight, however, there was a section of wire harness that had what looked like to be an excessive amount of black electrical tape wound around it near the top of the filter housing and a fairly large piece of it had come loose and was just hanging there. I would say a good inch and a half was dangling. I suspect that could easily make enough noise to travel through the ducts and into the cabin for your listening enjoyment. Unfortunately, I did not have any tape on me so I could not re-secure it but it was still sticky enough that I did give it one more good wrap. I won't know if it made a difference until I go home for lunch in 4 hours so you'll have to check back in to see if this did it. Once I get home, I'm either going to cut that piece off or slap some fresh tape around that section to make sure it does not come loose again.
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Old 07-30-2010, 09:08 AM   #22
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Will be keeping a close eye to see if that works. I cant help but feel like the sound is coming from inside the driver side of the dash somewhere. I hope thats not the case, because I cant take apart the dash, and I dont really want the dealer to have to either... once you start taking stuff off and putting things back on, you stand a huge chance of getting new vibrations. If I can get rid of this sound and the much more faint A-pillar squeak to go away, this car will be a quite riding machine. Only then will I be happy.
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Old 07-30-2010, 09:15 AM   #23
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Will be keeping a close eye to see if that works. I cant help but feel like the sound is coming from inside the driver side of the dash somewhere. I hope thats not the case, because I cant take apart the dash, and I dont really want the dealer to have to either... once you start taking stuff off and putting things back on, you stand a huge chance of getting new vibrations. If I can get rid of this sound and the much more faint A-pillar squeak to go away, this car will be a quite riding machine. Only then will I be happy.
I don't have the A-pillar squeak (thank God!) I hope this is it too because, I too have been cursed with the most sensative hearing when it comes to squeaks and rattles. I agree with you 100% about not wanting the dealer dismantling the dash. Luckily, my Camaro is still tight after 10,000 miles. This issue is the only noise related issue I have and it just started this week. I know that squeaks and rattles are inevitable with time but I want to keep them away as long as possible.
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Old 07-30-2010, 11:47 AM   #24
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Well, I report that the tape in the filter area was not the culprit. Unfortunately, I still don't know what is. I'll keep checking back in here for other suggestions. Thanks.
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Old 07-30-2010, 12:03 PM   #25
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Tap repeatedly along the top edge of the plastic cover where it meets the bottom of the windshield, the entire length of it. Bet a portion of it is not flat with the windshield and squeaks.



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