Rattling Cats vs. Rattling Heat Shields (V8) - How can you tell which? - LotusTalk

Mr. Esprit V8 · 03-16-2009, 12:59 PM

Can someone please advise on the difference in sound between a rattling cat vs. a rattling heat shield on a V8? Better yet, can someone please post a picture of heat shields on a V8, so I know where they are?

I have a rattling sound -- sounds like marbles in a can -- and I'm thinking it's the $$$ cat that needs to be replaced. I'm going for aftermarket high-flow cats. But I don't want to spend the money if it's just the heat shields.

Thanks in advance!

E5PR1T · 03-16-2009, 01:45 PM

Rattling Heatshields usually has the noise between 1800-2500 RPM, once RPM gets higher it will be gone...

I would start from the cats, just knock on it & see if it has any rattle sound.

Heatshields are hard to find...they're above the turbos right next to exhaust manifolds.

Email me if you need more info.

Alan
at0227@gmail.com

glb · 03-16-2009, 05:37 PM

get under car w/rubber mallet. tap and ye shall find.

I've secured many a heat shield w/metal straps and/or wire.

Mr. Esprit V8 · 03-17-2009, 01:35 PM

Thank you very much!

03-16-2009, 12:59 PM	#1 (permalink)
Mr. Esprit V8 Registered User Join Date: Sep 2004 Location: Beantown Posts: 238	Rattling Cats vs. Rattling Heat Shields (V8) - How can you tell which? Can someone please advise on the difference in sound between a rattling cat vs. a rattling heat shield on a V8? Better yet, can someone please post a picture of heat shields on a V8, so I know where they are? I have a rattling sound -- sounds like marbles in a can -- and I'm thinking it's the $$$ cat that needs to be replaced. I'm going for aftermarket high-flow cats. But I don't want to spend the money if it's just the heat shields. Thanks in advance! __________________ Spool 'em up! http://www.lotusenthusiasts.org/Cars...an/Default.asp

03-16-2009, 05:37 PM	#3 (permalink)
glb Unattractive Nuisance Join Date: May 2005 Location: Chester, NJ Posts: 4,523	get under car w/rubber mallet. tap and ye shall find. I've secured many a heat shield w/metal straps and/or wire. __________________ 05 elise (PES chip, SSRs, shift tower mods, Multivex; HID low beams); 05 Corolla XRS; 72 Elan Sprint, 170 hp (Sold) "Political language is designed to make lies sound truthful and murder respectable." G. Orwell. 6. "A bore is a man who deprives you of solitude without providing you with company." - Gian Vincenzo Gravina

03-17-2009, 01:35 PM	#4 (permalink)
Mr. Esprit V8 Registered User Join Date: Sep 2004 Location: Beantown Posts: 238	Thank you very much! __________________ Spool 'em up! http://www.lotusenthusiasts.org/Cars...an/Default.asp

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03-16-2009, 01:45 PM	#2 (permalink)
E5PR1T 98 Esprit V8 Calypso Red Join Date: Dec 2007 Posts: 138	Rattling Heatshields usually has the noise between 1800-2500 RPM, once RPM gets higher it will be gone... I would start from the cats, just knock on it & see if it has any rattle sound. Heatshields are hard to find...they're above the turbos right next to exhaust manifolds. Email me if you need more info. Alan at0227@gmail.com

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