sound when turning car off

[ExREX]

Hi All

My 135 has a funny rattle sound from the engine/exhaust when turning off. Anyone else have this?

G

[Taymaishu]

Any way you can tape it?

[banglemangle]

Mine does the same, both off and on!
Some will say its the clutch, but its not (makes no difference whether the pedal is depressed or not.

I think there are 2 possibilities:

1. Slightly loose heat shielding on / near exhaust system (my turbo Golf did the same thing)
2. Wobbly wastegates (some US cars suffer from this)

[Bdh821]

I'm pretty sure all BMWs do it. I heard its the vaccum baffel in the muffler.

[alik01]

Mine does it too, freaked out a few months ago, cos I couldn't remember whether it was there from new, the dealer charged 2 hours of labour to check everything and make sure nothing was loose.

Still not sure what it is, but sounds like an exhaust rattle to me.

[Jeef Beef]

Had the same sound since the car was new.

[penny]

Manual or auto? Make sure you depress clutch when turning off.

[ExREX]

manual, will check tomorrow re clutch in making a diff.

thanks for the feedback. sounds common. will be interesting to know if the 125s do it.

i have come to the conclusion that it sounds like a diesel with a throaty exhaust when it shuts down!

[Franco]

Mine also does this , especially after I drive it a little hard. I thought it was the fan continuing to cool down the engine but I may be wrong?

[HondaGoneRogue]

It's the clutch. Mine has done it since day one. Hefty clutches do that I was told. BMW also said it was normal. (Take that with a grain of salt lol.)

[Zuzu]

Originally Posted by HondaGoneRogue

It's the clutch. Mine has done it since day one. Hefty clutches do that I was told. BMW also said it was normal. (Take that with a grain of salt lol.)

100%... Depress the clutch whilst switching off as others have posted and problem solved.

And to prove this point, NO autos have this issue.

[ExREX]

confirmed test this morning clutch in and all OK

[alik01]

Sweet! Does anyone know if not depressing the clutch can cause damage?

[penny]

The manual actually says to have it in gear before turning off. So, obviously clutch has to be depressed. I doubt it hurts transmission.

[alik01]

That's good, penny. Cos all this time I just put it in neutral and then switch the engine off.

[Zuzu]

Originally Posted by alik01

Sweet! Does anyone know if not depressing the clutch can cause damage?

Not at all...

The noise on shutting down the engine without depressing the clutch is only your clutch release(throwout) bearing rattling as there is no load at the time in neutral with the clutch disengaged.
The bearing reduces friction between the pressure plate levers and the release fork to allow a smooth disengagement of the clutch plate during gear changes.

[ncutinelli]

Originally Posted by ExREX

manual, will check tomorrow re clutch in making a diff.

thanks for the feedback. sounds common. will be interesting to know if the 125s do it.

i have come to the conclusion that it sounds like a diesel with a throaty exhaust when it shuts down!

yep my 125i makes same noise .... clutch in = no noise

[alik01]

Thanks for the explaination Zuzu, much appreciated!

[TimMc]

Yeah I've got it.
Gears rattle against each other when there is no load. You should hear how noisy the gearboxes can be with idling BMW race engines with big cams and rough idle.

[555]

'Gearbox chatter' - so far the 2 cars I've had this in are the 135i and 350z

[SlicktopTTZ]

Originally Posted by 555

'Gearbox chatter' - so far the 2 cars I've had this in are the 135i and 350z

C5 Z06 does it too.

To be honest I kind of like the sound as it shuts down.....