Rattle Under Car Near Cat (Not the infamous muffler noise)
#1
Rattle Under Car Near Cat (Not the infamous muffler noise)
2008 G37s Coupe. Stock piping megan catback. No power loss low end. No noise coming from engine bay or intake arm. Cant feel vibration from in the car. Noise coming directly under car. What the FFFFFFFFF is this!!! Only happens at 1.5 - 2K rpm in parked or driving.
IMG_0633.MOV - YouTube
IMG_0633.MOV - YouTube
#2
Registered User
iTrader: (12)
Sounds like engine knocking, but from under the car.
I would check all the hangers and make sure they're where they're supposed to be. One of them might be out and is vibrating against the frame.
Also, might wanna have someone rev the engine with someone else underneath trying to find out where it's coming from.
Whatever it is, doesn't sound good.
I would check all the hangers and make sure they're where they're supposed to be. One of them might be out and is vibrating against the frame.
Also, might wanna have someone rev the engine with someone else underneath trying to find out where it's coming from.
Whatever it is, doesn't sound good.
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dbeachy1 (10-26-2013)
#5
i have the exact same problem with my g since i got it! i went to the dealership at least 4-5 time for this they were never able to replicate the problem. they said the exhaust line and the muffler was okay. But once in a while, i get that sound but when i rev it up to 3k rpm it goes aways. Its only doing it after driving the car for like 30min,stop it and then start it again after 15min. If you find what is the problem, let me know!
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#13
Registered Member
iTrader: (3)
I too had the exact same noise and took it into the dealer a few months back and they replaced the driver's side cat. Apparently the honeycomb material inside broke free and was rattling around - sounds like a run of crappy cats. It was covered under the base warranty only. I have a completely stock OEM exhaust btw.
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