BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST
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440i MPE - Valve/Exhaust Rattle in Comfort
| 01-14-2024, 08:21 PM | #1 |
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Hey, I am in need of some support;
My 440i with a MPE & Catless Downpipe has a rattle noise coming when the car is revved in comfort & when the car gets to around 2500rpm. Video Attached: https://youtube.com/shorts/-HGPVISNg8s?feature=shared (Valve closed) When the valve is opened, it sounds normal, no rattles or weird noises. Video Attached: https://youtube.com/shorts/e5SzcamLX...Zu0UGTUAireFPc (Valve Open) What could the cause be for the rattle when the valve is closed / opening. Thanks! |
| 01-14-2024, 11:24 PM | #2 |
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The valve lol.
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2022 CT4-V Blackwing 6-speed
SOLD: 2016 340i xDrive 6-speed DAW v2.5 turbo E40 | Dorch S2 | VRSF DP | MST intake | AWE catback | 335is clutch | CSF heat exchanger | RK Autowerks intake manifold | Orange M Perf Brake Kit | KW Street Comfort coilovers | GTS taillights V2 |
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| 01-16-2024, 08:57 PM | #4 |
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Rep 18
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Figured out the fix - the midpipe exhaust clamp for whatever reason was getting loose on its own.
My shop tried tightening it on a larger part of the exhaust but it wouldn’t hold its place. I ordered a new part from BMW for around 50$ and replaced the clamp. No more vibrations or rattle sound. |
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