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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHeat Shield vibrating
Reported or suspected cause
jubilee clip
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
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Reported cause
Had the same problem on mine - turned out to be the Jubilee clip that attaches to the exhaust support mounts / sleeves at the cats.
Leading evidence: 'jubilee clip' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'jubilee clip' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace clip' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed
I've used products like this on custom motorcycle fairings that had close proximity to custom headers exhaust pipes etc.
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Suggestion
Tye best option is to replace or rivet new material over the enlarged hole and make a new hole in the new material before replacing the clip.
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Suggestion · Original poster
I'm wondering if it could be the heat shields that run along side the mufflers that are rattling.
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So my car has this annoying buzzing sound that is noticeable mainly when taking off from a standstill. After looking under the car a bit, it seems that the heat shield near the exhaust is the problem (I can pull on it a bit and watch/hear it vibrate). Any ideas on how to stop it from vibrating?
I thought of putting some kind of rubber bushings up in there but then I remembered that it is a HEAT shield and they might melt...
I have the same problem. (drivers side). I have about 1/8 of inch of play. Also thought about rubber bushings, but was worried about heat. I'm currently using a few washers. Not scientific, but seems to work. Interested to see if others have same problem and a better solution.
The aluminium of heat shields always corrodes around the mounting holes, seems to attack the open edges, perhaps due to contact with ferrous metal, who knows. Washers work well, particularly with new clips, but they will eventually start tinkling away, new shields aren't expensive. Tye best option is to replace or rivet new material over the enlarged hole and make a new hole in the new material before replacing the clip. Some heat shielding from a plumbing shop wouod be fine, for the effort though, new is easiest...
The only heat shield that I know of is the one either side covering the Coils and plugs. Are the original bolts tight enough. Has someone had the shield off and put it back the wrong way up? I can't see the holes going larger. Have the correct length bolts been put back in place. If longer bolts were used then they would be tight before they hit the shield. All mechanics to my way of reckoning leave, loose, or disregard certain bolts from the car, especially those they think we will never see missing. I have been under my car doing PM and found lots missing from the front apron and was amazed at the plastic protection pieces and bolts that have been left off the vehicle by lazy assed mechanics. A wrong bolt was used on one of my coils. So having work records coming along with a used car means sweet F*** all to me after seeing the mechanics work on mine. The correct size screw in the heat shield should solve your problem or at least tighten the ones up that are loose. There are two on each shield. If that fails then use more washers under the head of the screw and tighten them. My guess is the far ones towards the rear of the car are missing. You have to take the rear wheel off to feel around properly for the back ones.
The tack welds and bolt holes rot, and the pieces rattle against one another. It even happens on California cars, and we don't exactly have a lot of salt on the roads out here.
If it's not the shielding, you probably have a catalytic converter that's chunking.
The heat shields I'm talking about are above the exhaust protecting the chassis. They work in combination with the shields which the rear pu mounts to and they also protect. The shields protecting the chassis above have holes which elongate as the material corrodes away. Same thing on my 928, new clips and shields sorted that for peanuts too, hardly worth bodging... they make quite an annoying noise when loose.
The ones you are to talking about though (protecting coils) seem to be a galvanised with some kind of insulation inside, mine were competely rotten when i did my coils, got new ones for �20 each from design911.co.uk :-)
OK Thanks for putting me straight Danny. That's UK class in action. I thought you meant the second heat shield you mentioned protecting the coils. I will have to look for the ones above the exhaust protecting the chassis.
Yes, the shields that I noticed as a bit loose are above the exhaust protecting the chassis. I was able to pull a bit on one end and let go and the whole thing vibrated like crazy.
Finally got some time to take pictures of the heat shield I believe is causing my buzzing sound at start-up... Sorry for the size. I've tried to indicate the shield I'm referring to. It runs the entire width of the car just above the exhaust. It seems to even go up to the bottom/back of the engine bay. I've put a red "X" on the offending piece. The piece is actually layered over the other aluminum heat shield which has the rough texture. The offending shield does not seem to be held down by any fasteners that I can see. Its almost as if it directly attached to some cross member at the back of the car. This shield is vibrating like crazy from what I can tell. Its one long vibrating metal sheet.
Any ideas as to what I'm looking at or how to stop it from vibrating ?
Interesting idea Seeeu911. I would be nervous about the Dynamat having issues with the heat down there. It gets really hot since it is just above the exhaust.
I've used products like this on custom motorcycle fairings that had close proximity to custom headers exhaust pipes etc. really high heat pipes with no melting of fiberglass or CF.
Just a thought.
http://www.heatshieldproducts.com/au...ermal-barriers
SJG, if your talking about the muffler shield. You can see it much better by removing the rear bumper. After removing the bumper, you will see that the shield is attached to the car by @4 or 5 small nuts and 2 screws, if IRCC. It will be obvious why its rattling once you remove the bumper.
So i took off the rear bumper cover and did not find any loose nuts/screws on the heat shields. I'm wondering if it could be the heat shields that run along side the mufflers that are rattling.
