Rattling while decel or rolling

[Quinton Exler]

Anyone else hearing a rattle while decelerating or rolling? Sounds like aluminum foil or something flapping around. Not very loud, no engine issues. Anyone else? Any ideas?
24500 miles here.


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[Chevrolet Customer Care]

Hey Quinton,

I understand that you have a concern while your vehicle is decelerating. I am not properly trained to offer technical advice, but I will be glad to look further into this concern for you. Please send us a private message including your VIN, current mileage, full contact information, and dealership name. Thank you.

Kristen A.
Chevrolet Customer Care

 

[Italianjoe1]

Rolling how? Deceleration I hear some popping through the exhaust at times but my car isn't too stock so I can't verify that that is a normal condition.

 

[Quinton Exler]

Not the exhaust. Sounds like a clip almost

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[Italianjoe1]

No what i'm saying is that sometimes I hear backfiring/popping through the exhaust on decel after stepping down, but it has an odd sound in this car. I know what it is but it's hard to explain. For me i'm fairly sure I hear it because of the catless O2 housing i'm using and the modified tune though, not so sure it would be obvious on a more stock car. It's a tick type sound though, not like a normal exhaust noise. That's why I ask.

 

[Blue hedgehog]

Loose heat shield? Try hitting the exhaust and floor boards around the exhaust with a rubber mallet to see if you can duplicate it while stopped.

 

[Quinton Exler]

I will check that, thank you

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[Quinton Exler]

Cant duplicate... I did however have my downpipe removed, I tightened the clamp to it more until it began to click then stopped tightening. The rattle changed, now its sometimes worse oddly. Any ideas?

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[Quinton Exler]

Can anyone confirm a torque spec on the down pipes band clamp?

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[wickedsonic]

i bet you still have a heat shield issue like the other guy said. Theres only bout 2.4 million of them on this car so it could be any of them.

 

[Quinton Exler]

Well I tightened the downpipe clamp after removing it and tightening it back and I think rattling stopped but I still need the band clamp torque spec.

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[Quinton Exler]

Rattling came back... oober annoying

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[Quinton Exler]

Not heat shields... I have retightened the downpipe band clamp 3 times already believing that was the cause of the rattle... hasnt solved it. Thats the best description I can give on how it sounds. It sounds like a small metal seal vibrating on decel rolling. Doesnt rattle in idle or while cruising.

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[Freem]

If you decelerate in neutral does the rattle continue once the engine is idling?

Just had my turbo replaced and had a similar problem prior to this. It was completely tied to engine speed though not vehicle.

 

[Quinton Exler]

See mine only happens on deceleration at a lower speed. If I'm on the highway I can go through all rpms available 2k-red line and hear no rattle.

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