Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Fluid Motor Union
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-14-2020, 07:00 AM
Member
 
Join Date: Mar 2020
Location: UK
Posts: 34
rbjtech is on a distinguished road
3.0d Turbo Pressure Convertor Valve

Hi All,

So I don't appear to have any boost on my 3.0d

Using a vacuum pump directly on actuator on the turbo itself it's holds about 23 Hg and I can see the rod clearly move. Removing the vacuum suddenly results in a mechanical clunk - so I think the wastegate/VVT is moving ok.

The pressure convertor is I think the problem but I'm not sure how to properly test it. If I apply a vacuum to the in pipe, whilst blocking the out pipe - it will get to about 23 Hg but it will not hold it - and in approx. 15 seconds, it is back to zero. I have tried new pipes, so think it is the unit. I believe it is supposed to hold the vacuum and only release when pulsed with 12v ?

Any help appreciated.

Thanks as always.
Reply With Quote

Sponsored Links

  #2  
Old 06-14-2020, 09:42 PM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 3,336
wpoll will become famous soon enough
Certainly sounds like the pressure converter could be leaking but they are modulated by a square wave signal in normal operation so testing requires more that just a leak-down test.

https://www.youtube.com/watch?v=lKnE0RDVXBU

There may be other causes for vacuum issues too. You can check the vacuum reservoir (#1) and the lines you can get at, but the vacuum manifold that feeds this is under the intake manifold.



https://www.newtis.info/tisv2/a/en/e...ontrol/AXdsYr2



https://www.newtis.info/tisv2/a/en/e...-valve/AVr13z5

At least the VVT vanes (there's no wastegate in these turbos) seem to be working.
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #3  
Old 06-15-2020, 06:48 AM
Member
 
Join Date: Mar 2020
Location: UK
Posts: 34
rbjtech is on a distinguished road
Fantastic response as always Wayne - many thanks.

I didn't realise the valve/controller is the same as used for the EGR (which is now blocked off). So will test that one as well and just block it off at the main vacuum tube if it's leaking - as while I don't need it to be working, I guess I may be loosing vacuum here if it is.

I've ordered a new Pierburg one - as both are originals, so it's done ok for 17 years of service !

Thanks for diagrams - very useful.
Reply With Quote
  #4  
Old 06-19-2020, 05:59 AM
Member
 
Join Date: Mar 2020
Location: UK
Posts: 34
rbjtech is on a distinguished road
So I have replaced the pressure convertor valve. I tested it before installing and can confirm that pressure is held in the unit - it does leak very slowly but that is likely my cheap vacuum pump.

I also checked the vacuum from the main pump when the engine is off and that held solid - so I'm confident I have no other vacuum leaks on the old EGR pressure convertor valve. If I did, I would have simply bypassed it as I now have no EGR anyway ..

The car now pulls strongly from much lower revs so I think this is now fixed.
Reply With Quote
  #5  
Old 06-22-2020, 02:48 PM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 3,336
wpoll will become famous soon enough
Thanks for the update!
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 03:24 AM.
vBulletin, Copyright 2020, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.