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Z4 3.0si N52 (facelift) hissing / performance issues

Discuss problems you have had or are having with your Z4
Scooba_Steve
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by Scooba_Steve » Wed Sep 27, 2017 10:00 pm

Probably the starter too :lol:
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David
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Sun Oct 22, 2017 3:05 pm

Finally getting on top of this. Pausing mid-work with research needed.

I’m replacing the CVV and very nearly have the manifold out.
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The good(?) news is that the CVV is leaking, and looks like it has been for a little while, as you can see from the picture.

The problem I’m having now is that my manifold (early 3.0si has a line from the master cylinder running through it.
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Does anyone have a link to a how to specifically for the Z4 early N52? Can only find other series...

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David
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Sun Oct 22, 2017 3:13 pm

A quick bit of research tells me it’s the “master brake booster vacuum hose” as desribed somewhere here:

http://www.zpost.com/forums/showthread.php?t=455180

Back to work...

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David
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Sun Oct 22, 2017 7:11 pm

And then out came the manifold.
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On closer inspection it looked like the oil was coming from the secondary DISA, so I removed that and...
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The seals are toast! Planned on scraping out the rubber, before realising that the inner rubber seal (for the flap) has had it as well.

Looks like I’m replacing this too. And this could very well be the cause of the hissing noise.

Also, there’s a bit more oil than I’m comfortable with inside the manifold, so looks like I am right to replace the CVV in the first place, but happy that I’ve found another potential culprit.

As a side note, I’m also replacing/refurbishing the starter motor. Will decide which one once it’s out.

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by David » Sun Nov 12, 2017 10:57 am

Carmad84 wrote: Wed Sep 06, 2017 9:11 pm I have the same sound on very light acceleration but no petrol smell.

I just thought as the tech guy that it was a common thing.

I think you have to have good hearing as I keep trying to get other people to hear it and they never can, I think some think I've gone crazy!
I’m happy to inform that both the hissing and performance issues have gone as a result of removing the mani and replacing the Secondary DISA and CVV. As you can see from the pictures I posted a few replies up, the hissing was most likely caused by the disintegrated DISA seal.

Case closed! :thumbsup:

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by Marlon » Sun Nov 12, 2017 11:14 am

David wrote: Sun Nov 12, 2017 10:57 am
Carmad84 wrote: Wed Sep 06, 2017 9:11 pm I have the same sound on very light acceleration but no petrol smell.

I just thought as the tech guy that it was a common thing.

I think you have to have good hearing as I keep trying to get other people to hear it and they never can, I think some think I've gone crazy!
I’m happy to inform that both the hissing and performance issues have gone as a result of removing the mani and replacing the Secondary DISA and CVV. As you can see from the pictures I posted a few replies up, the hissing was most likely caused by the disintegrated DISA seal.

Case closed! :thumbsup:
Result - impressive work :thumbsup:
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by ph001 » Sun Nov 12, 2017 1:09 pm

Good man. Love a good diy fix. I wonder if the later black top engines are any different in these areas?
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by 1doohan » Sun Nov 12, 2017 2:08 pm

Love a happy ending....but that's another story
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by Smartbear » Sun Nov 12, 2017 4:46 pm

ph001 wrote: Sun Nov 12, 2017 1:09 pm Good man. Love a good diy fix. I wonder if the later black top engines are any different in these areas?
Hi, when you say black top engines do you mean the plastic cover which sits on top of the cam cover or the cam cover itself?
The different colour plastic covers don’t signify any differences themselves but engines with black cam covers have an integrated ccv instead of the remote item below the inlet manifold fitted to engines with the earlier metal cam covers :thumbsup:
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by ph001 » Sun Nov 12, 2017 5:47 pm

Yeh, that’s what I meant. I seemed to remember something about the ccv being different - thanks. I know they have a different dme as well (faster cpu) but I bet the map is the same.
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by WouterZZZZ » Sat Aug 21, 2021 2:23 pm

Thanks for the guideline and advises above in solving the hissing sound during acceleration. N52 Z4 3.0si from september 2006, low mileage. We replaced the full CCV and the smaller DISA. You can clearly see the differences between the old (various parts of the rubber gone and oil on it) and the new. The oil separator and all tubes also replaced. Hissing sound fully gone, driving like a charm.
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Z4 3.0si N52 (facelift) hissing / performance issues

Post by WouterZZZZ » Sat Aug 21, 2021 2:59 pm

In addition: the petrol smell during start-up, has also gone!

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Z4 3.0si N52 (facelift) hissing / performance issues

Post by LBN » Wed Feb 09, 2022 11:02 am

Glad I found this thread, my E86 has just started making a bit of a hissing noise. Hopefully it’s just some perished rubber that’s easy to get to, don’t fancy taking the inlet manifold off :rofl:

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