Flywheel Rattle?

[CB762]

Under very light braking, or just coasting down the hill in neutral, there is a quite loud rattle coming somewhere from the transmission area and it continues for 2-3 seconds. If clutch pedal goes down then rattling stops instantly. It sounds to me like the flywheel rattle I've had on Mini few years back (it did rattle at idle tho).
Car is doing it from the very beginning and I have around 500 miles on odo now.

Anyone experience it?

[#87]

I have a different rattle, if I push in the clutch quickly when cold it makes an awful chatter. Weird though, it only happens when cold and goes away quick.

I only notice because my parking space is in the middle of the block so I start the car, drive to the corner in first gear getting up to 15 mph max, then clutch in and brake for stop sign. Chatters everyday in this spot but not in stop go driving, weird.

[Lee358]

i was just going to post something about a rattle i hear when im breaking in neutral i took a video of it its around 27 seconds in when the speed gets right below 30 MPH

http://s421.photobucket.com/albums/p...t=IMG_1331.mp4

[Lee358]

Is that the noise your hearing?

[Laika]

Lee I hear that noise all the time!

[Lee358]

Laika any idea what it is?

[vobla6.0]

Originally Posted by CB762

Under very light braking, or just coasting down the hill in neutral, there is a quite loud rattle coming somewhere from the transmission area and it continues for 2-3 seconds. If clutch pedal goes down then rattling stops instantly. It sounds to me like the flywheel rattle I've had on Mini few years back (it did rattle at idle tho).
Car is doing it from the very beginning and I have around 500 miles on odo now.

Anyone experience it?

Would this rattle be speed specific (at a certain speed), or does it go on-off at any speed when the car is in neutral?

[Sigh-on-Rice]

Originally Posted by Lee358

i was just going to post something about a rattle i hear when im breaking in neutral i took a video of it its around 27 seconds in when the speed gets right below 30 MPH

http://s421.photobucket.com/albums/p...t=IMG_1331.mp4

That's a normal noise of direct injection.

[Laika]

Originally Posted by Sigh-on-Rice

That's a normal noise of direct injection.

Very interesting! Would you be able to elaborate more? I'm very new to DI and curious to know.

Lee: I had no idea what it could be, I totally thought it was a flywheel/driveshaft noise

[Sigh-on-Rice]

Originally Posted by Laika

Very interesting! Would you be able to elaborate more? I'm very new to DI and curious to know.

When I picked the car up from the dealer, they gave me a piece of paper explaining certain things and DI noise was one of them. I threw away the paper, so I don't know how it explained. But the noise in the vid is the noise that paper talked about saying its normal noise.

[CB762]

Originally Posted by Lee358

Is that the noise your hearing?

Yes, sounds pretty much like what I got.
If that is due to DI then why: it happens only while in neutral; it stops instantly with clutch in?

[3essess]

First off, love the way the car drives except for this one "grinding" or "rattling - gear grinding type" sound that happens exactly as you described and in your vid.
It sort of sound like the sound made when you're trying to put your car into gear without using the clutch. After driving for over 1000 miles, I can usually make this sound happen under the following conditions:

1) When slowing down for a stop or turn, put your car into neutral - so your coasting down.

2) When slowing down in neutral, the revs will usually settle in around 1000 rpm or so until you get down to below 25mph or slower. Then the revs will finally settle in to 700 or so...then the revs will bounce down lower to 550 to or 650 rpm and that is when I hear the rattling sound.

3) Like you, I also can make the rattling stop if I push in the clutch, or, if I bring the revs up via the throttle - the sound goes away. Or, if I do nothing, it will slowly stop in about 2 or 3 or 4 seconds - once the engine revs recovers.

4) No matter how hard I try to duplicate the sound with the car NOT moving, it will not happen. The car needs to be moving in neutral to make the sound come out.

5) To me, it sounds like something in the transmission is rattling, whether gears or rods or whatever. Could it be the motor knocking at that low rpm - I hope not.

We gotta get this resolved...

Thanks.

[CB762]

Well, I think I'll take it back to the dealership for the answer.

[3essess]

I'm also thinking it could be some sort of harmonic vibration due to the low engine revs and the clutch being out and the transmission still spinning while moving at certain speed. I think ultimately, if the revs never bounce that low, it would not make the sound. IOW, fix the low idle issue, you don't get this rattle?