Rattling sound MPE exhaust on coldstart

[M 4 FUN]

Hi guys. I have a rattling sound in my MPE exhaust on coldstart. Only coldstart, as soon as it warms up it disappears. It comes and goes a Little when Cold. There is no stones in the tips, the rear heatshield is tight and i can't really replicate it when i hit it. Any ideas?

Thanks, Johnny

[Bmwlmr99]

Take a good look at the wields etc, may have developed cracks etc...I had mine repaired several months ago

[M 4 FUN]

Originally Posted by Bmwlmr99

Take a good look at the wields etc, may have developed cracks etc...I had mine repaired several months ago

Ok, thanks, i let them have a look at it.

[f80_sturmgewehr]

Wastegate rattle perhaps?

[Gsv77]

Originally Posted by M 4 FUN

Hi guys. I have a rattling sound in my MPE exhaust on coldstart. Only coldstart, as soon as it warms up it disappears. It comes and goes a Little when Cold. There is no stones in the tips, the rear heatshield is tight and i can't really replicate it when i hit it. Any ideas?

Thanks, Johnny

I would start it up and go to the rear of the car and hold each exhaust tip. Mine have worked loose a few times and you can usually find at least 1 of the 4 that are vibrating upon start up. Carefully tighten the self taping hex screw for each tip.

[scoobyhummel3]

i have same problem and finally i find out its the valve itself, the wastegate cant close properly when its cold. its no problem when its new but a couple months later its gradually making rattle noise. been told its normal so i just leave it as it was

[M 4 FUN]

Originally Posted by scoobyhummel3

i have same problem and finally i find out its the valve itself, the wastegate cant close properly when its cold. its no problem when its new but a couple months later its gradually making rattle noise. been told its normal so i just leave it as it was

Ok. The thing is that it only is on coldstart when the weastegates are open. As soon as the car heats up a little the rattling disappears, Before wastegates Close.

[UsAs]

Originally Posted by f80_sturmgewehr

Wastegate rattle perhaps?

wondered about wastegate rattling on mine