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Z4 3.0si N52 (facelift) hissing / performance issues
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- Lifer
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Z4 3.0si N52 (facelift) hissing / performance issues
Probably the starter too
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.
- David
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Z4 3.0si N52 (facelift) hissing / performance issues
Finally getting on top of this. Pausing mid-work with research needed.
I’m replacing the CVV and very nearly have the manifold out.
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.
Does anyone have a link to a how to specifically for the Z4 early N52? Can only find other series...
I’m replacing the CVV and very nearly have the manifold out.
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.
Does anyone have a link to a how to specifically for the Z4 early N52? Can only find other series...
- David
- Member
- Posts: 112
- Joined: Thu Mar 03, 2016 8:01 pm
Z4 3.0si N52 (facelift) hissing / performance issues
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...
http://www.zpost.com/forums/showthread.php?t=455180
Back to work...
- David
- Member
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Z4 3.0si N52 (facelift) hissing / performance issues
And then out came the manifold.
On closer inspection it looked like the oil was coming from the secondary DISA, so I removed that and...
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.
On closer inspection it looked like the oil was coming from the secondary DISA, so I removed that and...
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.
- David
- Member
- Posts: 112
- Joined: Thu Mar 03, 2016 8:01 pm
Z4 3.0si N52 (facelift) hissing / performance issues
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.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!
Case closed!
- Marlon
- Lifer
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Z4 3.0si N52 (facelift) hissing / performance issues
Result - impressive workDavid wrote: ↑Sun Nov 12, 2017 10:57 amI’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.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!
Case closed!
Gone: 3.0si 2008 E85
911 997 Carrera S
- ph001
- Lifer
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- Location: N. Yorkshire.
Z4 3.0si N52 (facelift) hissing / performance issues
Good man. Love a good diy fix. I wonder if the later black top engines are any different in these areas?
- 1doohan
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Z4 3.0si N52 (facelift) hissing / performance issues
Love a happy ending....but that's another story
Z4C Sapphire Black 398s Whippy
M4 Competition
M4 Competition
- Smartbear
- Lifer
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Z4 3.0si N52 (facelift) hissing / performance issues
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
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
- ph001
- Lifer
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Z4 3.0si N52 (facelift) hissing / performance issues
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
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
In addition: the petrol smell during start-up, has also gone!
- LBN
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Z4 3.0si N52 (facelift) hissing / performance issues
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