Advice Required - Noise at 2500 to 3500 RPM

J

JackZ4

Member
 Nottingham
Hey Guys,

Apologies if this has been covered within another thread/post, but as the subject title suggest, any help or advice is appreciated.

A couple of days ago a strange deepish sound started occurring between 2500 and 3500 rpm when you're accelerating steadily or going up an incline with a little gas, the noise itself doesn't appear all the time and has only made itself apparent a few times over the past couple of days, furthermore, I have noticed that the noise happens in multiple gears and only when the engine is at optimum temperature.

If my hearing isn't failing me, the sound seems to be coming for from either underneath the cabin or closer to the engine bay.

I have also asked a friend for help who seems to believe it may be gearbox or exhaust related, would this be correct, or could it be something else?

The vehicle itself is a BMW Z4 Coupe from 2006 and currently stand at 95,000 miles if this information helps narrow down the cause.

I will try and answer any questions the best I possibly can - I'm no mechanic :(

Thanks for your help in advance,
Jack
 
Ducklakeview said:
Worth a read...

https://z4-forum.com/forum/viewtopic.php?f=3&t=100400&hilit=dmf

Mike
Click to expand...

Hi Mike,

Thanks for the response, that thread you linked was definitely an interesting read, laughed way too much at 'Sounds like a skeleton having a w@nk in a biscuit tin...' and the DISA Valve that was mentioned might be the contributing factor to my noise as well which i'll discuss with my local garage as soon as possible.

However, just in case that I'm wrong and it is not the DISA Valve, I've been for a quick run and had a proper listen to sound which actually seems a whine rather than a deepish sound, made a recording of the noise that hopefully is clear enough in the video, the sound changes at around 5/6 seconds before I lift off the accelerator as if something is kicking in/starting, any ideas?

[youtube]https://youtu.be/NBNb2Kxb278[/youtube]

Cheers,
Jack
 
Very hard to make anything out on the clip unfortunately. I think I would change out the gearbox and diff oil and go from there. If it's never been done and you are at 95,000miles then it's defo something I'd recommend anyway.
 
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