Rattle midcar in exhaust

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Rattle midcar in exhaust

Postby 89gunit » Tue Jul 20, 2021 9:42 pm

I have a really loud noise that started couple days ago on my '08 Infiniti M45x with 184 thousand miles. It stays the same noise when accelerating. No clue what it could be. Help!!!!
Last edited by Rogue One on Wed Jul 21, 2021 1:22 pm, edited 1 time in total.
Reason: Moved to correct forum

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Re: Rattle midcar in exhaust

Postby mdmellott » Tue Jul 20, 2021 11:16 pm

Heat shields at many positions around the exhaust tubes have a tendency to fall off over time due to rust. They can make lots of rattle noises until they do finally fall off. Stainless steel band clamps can often be used to secure these loose pieces or replacements might be available.

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Re: Rattle midcar in exhaust

Postby PapaSmurf2k3 » Wed Jul 21, 2021 11:38 am

Yeah, you're gonna have to get under there and start pounding/shaking some stuff with your hands and fists to see what might be going on.

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Re: Rattle midcar in exhaust

Postby EniGmA1987 » Wed Jul 21, 2021 1:42 pm

Could be a heat shield, could be your cats went bad and a chunk of the honeycomb started travelling down the exhaust, could be a section rusted away and the pieces are ratling up against each other.

Anything it might be, best to simply get under the car and look at things and try shaking stuff and see what is loose.

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Re: Rattle midcar in exhaust

Postby MM...Good » Mon Aug 02, 2021 4:10 pm

Agree its likely just a loose shield. I just fixed mine on the driver side right at the Y pipe. $2 fix with a steel clamp. Noticed the shields on both my cats are basically rusted through. No rattles though. My baby is getting old!

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Re: Rattle midcar in exhaust

Postby L5211 » Tue Aug 03, 2021 9:22 am

Mine did this too. Heat Shield. Cheap fix at mechanic.

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