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G37 rattle/knocking/tapping

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Old 11-15-2017, 10:31 PM
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Nick White
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G37 rattle/knocking/tapping

Having this issue with a rattle/knocking/pinging sound. been going on for a couple thousand miles, isn't getting any better or any worse. I've searched the forums but I can find one that's the same or with a solution. The rattle happens at idle to about 2200rpms and then it goes away. the video is pretty much right under the driver's side cat while I rev it to about 2k. The sound doesn't seem to be coming from under the hood, just under the engine, I can't even hear it under the hood. sounds like a popping/knocking sound. Does anyone have the same problem or know what it is and the solution? https://www.youtube.com/watch?v=5lAKtvRF3VY&feature=youtu.be (wait until the car is revved a little in the video, you will hear the sound quite easily)

Last edited by Nick White; 11-15-2017 at 10:39 PM. Reason: adding information about the issue
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Old 11-16-2017, 01:20 PM
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terribleone
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I believe I have the same rattle (haven't yet found a fix). Do you have aftermarket cats? Or any aftermarket exhaust components?
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Old 11-16-2017, 02:27 PM
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Sounds very scary. Im in no way an expert at diagnosing so ill refrain. But doesnt sound good. Weird is at idle that sounds healthy normal then gets weird.
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Old 11-16-2017, 03:44 PM
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Your cats are loose - My friend's coupe had the same noise

Get this on the lift and you will figure it out
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Old 11-17-2017, 10:12 AM
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Originally Posted by 2011-G View Post
Your cats are loose - My friend's coupe had the same noise

Get this on the lift and you will figure it out

That's interesting. I have yet to hear another G with that exact noise, all I can find is the muffle problem with the spot welds breaking (but I have a muffler delete and it's still there) I'll definitely look into that, thank you!
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Old 11-18-2017, 10:16 PM
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UPDATE:
It is indeed the catalytic converter. the material inside broke and that is what the rattling sound is. will be replacing it very soon.
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