What's that noise ! Common part failure

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nkfb1
Joined: Mon 19 Aug, 2013 07:07
Posts: 24

  Z3 roadster 2.8

What's that noise ! Common part failure

Post by nkfb1 » Sun 18 Jun, 2017 06:43

Thought I'd share a recent problem. I have had this really annoying whining type noise for about 18 months. It was coming from the engine bay and only between 1750 and 3000 revs. It only did this under load so never when static.. Thought it might have been a belt or alternator bearing . Then looked at clutch bearing possibilities.... nope ruled.out.Vanois nope not that either. Mechanics including dealer and very exp. . Indy could not figure it out. ..
Well I happened to notice when cleaning what I thought was a small tear in the tube elbow that directly fits
into the throttle body. It is the last connecting tube section running from the air filter box and has a small secondary tube also running off it into the throttle area.
Replaced it and voila noise gone. There was a large tear in the small tube which is hidden due to how and where fitted.
The Bmw dealer said it was a common fault on z3 and z4 so they kept them in Stock. £13. Called a tube elbow. My part no was B13541435627. Fiddly to fit 45 mins and you need a mini socket to release the hose clips.
Hope this helps someone else. !

therealdb1
Joined: Tue 25 Jun, 2013 22:47
Posts: 247

  Z3 roadster 2.0

Re: What's that noise ! Common part failure

Post by therealdb1 » Sun 18 Jun, 2017 10:19

A very common failure indeed although slightly unusual symptoms.
Normally you would notice running problems rather than a noise due to unmetered air getting into the engine.
At least you are a happy bunny now and you did the right thing getting a genuine BMW part. :D
There are lots of copy parts around that do not always quite fit correctly and actually cost more to buy than the genuine item from a franchised stealer!

nkfb1
Joined: Mon 19 Aug, 2013 07:07
Posts: 24

  Z3 roadster 2.8

Re: What's that noise ! Common part failure

Post by nkfb1 » Mon 19 Jun, 2017 07:41

There was no noticeable performance issue which I agree you would thinks would have been obvious. Having fixed it it does seem more surely though. Happy days ..

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