Exhaust Valve Rattle

QM · 10-09-2018, 09:13 PM

All of a sudden my stock exhaust valve started loudly rattling at idle and low speeds until I gain rpm. Sounds like I'm dragging empty metal beer cans behind the car (and no this is not rocks in the brake shield). Had a shop confirm today that the exhaust valve bushing may be loose. I typically drive in Sport +, but this happens in all driving modes now. I think the valve no longer opens and closes controllably.

I have a 17 M2. Stock exhaust. Fabspeed sportcat (on for a year).

Anybody else had that happen?

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nioh_lbbm2 · 10-10-2018, 08:29 AM

Mine rattles sometimes on cold starts. Doesn't sound as bad as what you describe tho.

Worried me so I went searching online and seems to be a common trend on BMWs. Just google "bmw valve rattle" and you'll see plenty of posts

10-09-2018, 09:13 PM	#1
QM First Lieutenant 287 Rep 312 Posts Drives: 2020 M2CS 6MT Join Date: Oct 2015 Location: Illinois iTrader: (2)	Exhaust Valve Rattle All of a sudden my stock exhaust valve started loudly rattling at idle and low speeds until I gain rpm. Sounds like I'm dragging empty metal beer cans behind the car (and no this is not rocks in the brake shield). Had a shop confirm today that the exhaust valve bushing may be loose. I typically drive in Sport +, but this happens in all driving modes now. I think the valve no longer opens and closes controllably. I have a 17 M2. Stock exhaust. Fabspeed sportcat (on for a year). Anybody else had that happen? :
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10-10-2018, 08:29 AM	#2
nioh_lbbm2 Lieutenant Colonel 1717 Rep 1,899 Posts Drives: M2 Join Date: Mar 2018 Location: California iTrader: (0)	Mine rattles sometimes on cold starts. Doesn't sound as bad as what you describe tho. Worried me so I went searching online and seems to be a common trend on BMWs. Just google "bmw valve rattle" and you'll see plenty of posts
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