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Thread: Heat shield issue
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04-16-2012, 07:37 AM #1
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Heat shield issue
At 1500 rpm there is a vibrating sound inside my car, I'm pretty certain it's the heat shield that's attached to the underside of the car, above the Y-pipe. There is also some kind of bracket that looks like it's supporting the Y-pipe itself. Before I go ahead, is it OK to remove these items?
The bracket appears to be a possibly unnecessary extra bit of support, but I'm not sure about the heat shield either, is it protecting something that I can't see?
Cheers
Mike.
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04-16-2012, 08:13 AM #2
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Navy Blue Metallic- 98 T/A w/ mods, 00 FBVert
Heat shield on the driver's side is protecting the hydraulic clutch hose that comes from the master to the slave cylinder. If it is removed it will heat up your fluid and an cause issues. Even with headers they are needed. Passenger side I believe is protecting some wire harness that are in that area. Both also reduce the heat transfer from the CATs into the floorboards.
If you have a problem with the screws vibrating out, use a little lock tight to keep in place.
The bracket does support the Y pipe. The OEM pipe is a heavy sum bitch and will also vibrate. The bracket is to keep it from drooping down and slapping the floor boards.
If you go to an aftermarket ORY, most are very light when compared to the stock ORY. Some get an after market kit to do like the stock bracket does.
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04-17-2012, 08:30 AM #3
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Thanks for the input I really appreciate it.
I'll be leaving them alone then. I'm pretty sure the screws are firm in place, but I need to figure out how to stop the shield itself from vibrating or maybe packing some kind of sound deadening behind it.
I will be going to an aftermarket system eventually, I'll try it without the bracket first and see from there.
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04-18-2012, 11:54 AM #4
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Navy Blue Metallic- 98 T/A w/ mods, 00 FBVert
I'm not using a braket and my ORY is tucked to within 1/2" from the floorboards. When I used the U clamps it would vibrate and rub. But since I've welded my ORY all together - no more issues.
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06-16-2012, 07:01 AM #5
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06-16-2012, 12:14 PM #6
The heat shield screws are very tiny, but have a coarse thread. If the holes aren't stripped or rusted, you can install a fender washer (large washer with a tiny hole) for more clamping force on the heat shield. If the holes are stripped, simply buy a larger sheet metal screw and run it in the hole. Chances are it dropped a screw or rusted through and that is why it is vibrating.
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06-17-2012, 02:52 AM #7
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06-18-2012, 07:53 AM #8
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Been under the car today, all the bolts are nice and tight - I even packed some pieces of rag where one section of heat shield meets another and in sections where it has flexibility.
Rattle/vibration still not gone.
I'm baffled, anybody got any suggestions?
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06-18-2012, 08:18 AM #9
Are your catalytic converters by chance after market units, possibly with a heat shield around them of their own?
I ran an after market cat on my 01 v6 Camaro that had a heat shield of its own,
and after about a year the shield started to rattle.
I gave it a quick wack with a rubber mallet and the rattle went away.
Just a thought..
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06-18-2012, 08:21 AM #10
Could be something other than the heat shields then. When our catalytic converters go bad, they will sometimes "rattle". The substrate in the cases breaks up and pieces of it will cause this sound. Another culprit is the heat shield on the underbody where the exhaust goes up over the rear axle. Noises can be very difficult to locate and it sometimes helps to have a second set of ears in the car.
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06-18-2012, 08:29 AM #11
Yes sir! I have a old thread here about my stock cat doing just that.
The grid material inside broke in half and rattled terribly. I also dropped a ton of power though.
How about brake and fuel hard lines chattering against the under carrage maybe?
Or possibly could even be your parking brake cables.
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06-18-2012, 09:47 AM #12
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The best way I could describe this particular sound - watch the following video with the guy flicking a metal ruler.
This is the sound (but sustained) that comes from my car at exactly 1500 rpm
Video here:
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06-18-2012, 12:22 PM #13
I know you have a problem with your car, but that was not what I expected.
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06-18-2012, 01:47 PM #14
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06-18-2012, 04:20 PM #15
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06-18-2012, 06:51 PM #16
that's messed up right there......my vote is a cat rattling. Of course that is if it isn't some guy under there playing the ruler.
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06-19-2012, 06:59 AM #17
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06-19-2012, 07:35 AM #18
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Navy Blue Metallic- 98 T/A w/ mods, 00 FBVert
Sorry for the long time getting back to you, I was on vacation...
Do you still have CATS?
When you say you have a vibration, is it coming from the floor boards by your feet or somewhere else?
I had a rattle for a few months after I installed my PRO 5.0 shifter, couldn't locate it at all. Drove me nuts some times. Like you it would only rattle at certain rpms. Finally had enough and started taking the center counsel apart. When I got to the screws that are in the spot where the TCS buttons sit (if I had one) I notice there wasn't a screw. I also had one missing on the passenger side where the cup holder is. I tap the counsel in those spots and yep it rattle. Got some screws and put it all back together. No more rattles.
Sometimes it the simple things that get you.
<<Not going to ask how/why you found ruler man...
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06-19-2012, 11:56 AM #19
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That's quite alright, everybody needs a vacation.
At present I do, the previous owner said he'd had stainless aftermarket ones fitted. I will be looking to go to a system that has removable cats. As long as you can pass emissions at test time, there's no legal requirement to have cats fitted the rest of the time.
The sound fills the whole interior so it is very difficult to pin-point exactly where it's coming from.
I've got nothing to lose (besides the ratttle) by trying this.
You got that right.
YouTube sure is full of strange stuff.
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