This is the most uncharacteristic Z4 video I have ever seen - roof up in sunny weather and an inordinate amount of indicating
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BMW howling sound from the rear end.
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Zedebee
- Lifer
- Posts: 3837
- Joined: Tue Sep 29, 2020 10:37 pm
- Location: North Hampshire
BMW howling sound from the rear end.
2003 Maldives Blue 3.0i auto
Previously: Maldives Blue 2.5i manual (its back!) and another, and a Monaco Blue 3.0Si coupe
Previously: Maldives Blue 2.5i manual (its back!) and another, and a Monaco Blue 3.0Si coupe
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MikeyH
- Lifer
- Posts: 5676
- Joined: Sat Oct 02, 2021 10:57 pm
- Location: Devon
BMW howling sound from the rear end.
Apart from all the indicating noise it sounds like mine. 
Now, Sterling grey Z4 2.2 with cup holders, stubby aerial and sport seats. Roadsters ‘cause they’re great with the roof down.
Ford Anglia, Red Sprite, a few MG midgets, MGB Roadster and yellow Ford Capri, all gone many years now.
Ford Anglia, Red Sprite, a few MG midgets, MGB Roadster and yellow Ford Capri, all gone many years now.
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arny14
- Newbie
- Posts: 15
- Joined: Sat Jun 18, 2022 10:02 pm
BMW howling sound from the rear end.
CSB, FLEX disc, Diff changed. Still the same noise.
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ml1nov1980
- Newbie
- Posts: 10
- Joined: Wed Jul 19, 2023 4:06 am
- Location: Van Buren , Arkansas
BMW howling sound from the rear end.
I found that the noise is the pinion gears
Also found it is cheaper to change the entire diff with a used one than to put in new pinion gears!!
Also found it is cheaper to change the entire diff with a used one than to put in new pinion gears!!-
arny14
- Newbie
- Posts: 15
- Joined: Sat Jun 18, 2022 10:02 pm
BMW howling sound from the rear end.
Than every diff has this noise, i swapped 3 different diff, still the same noise at 30km/h.
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enuff_zed
- Lifer
- Posts: 16396
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
BMW howling sound from the rear end.
You sure it’s not a wheel bearing?
HQ of 'Norfolk Zed Rescue'.
Always happy to help if I can.
If the forum helped you, why not help the forum back. Thats the Z4 way!
Always happy to help if I can.
If the forum helped you, why not help the forum back. Thats the Z4 way!
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ml1nov1980
- Newbie
- Posts: 10
- Joined: Wed Jul 19, 2023 4:06 am
- Location: Van Buren , Arkansas
BMW howling sound from the rear end.
Sure hope the change in diff corrects the noise!! Hate to think I’m going to all this work and still not fixed
I’m a graduate of Utube University so I’m tackling the job myself!! Got a salvage diff for $499
I’m a graduate of Utube University so I’m tackling the job myself!! Got a salvage diff for $499-
MikeyH
- Lifer
- Posts: 5676
- Joined: Sat Oct 02, 2021 10:57 pm
- Location: Devon
BMW howling sound from the rear end.
I've got a woo woo sound sometimes that increases with speed, like when driving past roadside posts/fencing. My wife says she can't hear it but I can. Since I had my new rear tyres, they are Goodyear asymmetric 6 so can't be them surely, hoping it's nothing more than the hand brake pads sticking a bit. This thread has now got me worried though 
If it is bad at least I'm in the UK so help is only 3 hours drive away 
If it is bad at least I'm in the UK so help is only 3 hours drive away Now, Sterling grey Z4 2.2 with cup holders, stubby aerial and sport seats. Roadsters ‘cause they’re great with the roof down.
Ford Anglia, Red Sprite, a few MG midgets, MGB Roadster and yellow Ford Capri, all gone many years now.
Ford Anglia, Red Sprite, a few MG midgets, MGB Roadster and yellow Ford Capri, all gone many years now.
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deltasierra
- Member
- Posts: 302
- Joined: Thu Jun 23, 2022 7:32 pm
BMW howling sound from the rear end.
Is the car lowered or wide tyres rubbing on the bodywork as the rear suspension compresses on accelleration, it could be a broken spring but you would have seen that when you did the diff.