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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Vacuum issues N54 2007 335i



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      03-06-2015, 11:22 PM   #1
RU QWKR
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Vacuum issues N54 2007 335i

Just bought and installed new VRSF charge pipe and Tial BOV. BOV wasnt opening so checked vacuum and at idle I am pulling 10 in/hg and at rev 14 in/hg. Replaced vacuum lines at throttle body and 2 that run over the oil filter housing. Can any of you point me in a direction to look where my vacuum is escaping. Also 2 other points, my car is not throwing any codes and I am at altitude 5600 feet. Much appreciated for the help
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      03-07-2015, 12:50 AM   #2
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Check the ones where the two canister are at right by motor good luck


The lines run down also as u can see mine needs to be replaced =P
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      03-07-2015, 04:21 AM   #3
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are you sure BOV is working fine?

it should be opening some.. IMO
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      03-07-2015, 10:31 AM   #4
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The BOV could be an issue IMO but trying to rule out where some common leaks are to go hunting as everyone is telling me even at altitude I shouldnt be half of the vacuum that most cars run at. Thanks for the reply and input as it looks like I will be digging around the passenger side of the car a bit today
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      03-07-2015, 10:38 AM   #5
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Originally Posted by RU QWKR View Post
The BOV could be an issue IMO but trying to rule out where some common leaks are to go hunting as everyone is telling me even at altitude I shouldnt be half of the vacuum that most cars run at. Thanks for the reply and input as it looks like I will be digging around the passenger side of the car a bit today
Replace all vacuum lines. It's not that hard and it's worthwhile to do. The other issue could be your boost solenoids.
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File Type: pdf B122807Vacuum_and_Boost_Values.pdf (35.1 KB, 121 views)
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      03-07-2015, 10:46 AM   #6
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fmonteiro444, great info and it will point me in the right direction to find out where this PITA leak is. Thanks for the input, it is much appreciated
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      03-08-2015, 06:09 PM   #7
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fmonteiro444, do I need to go factory vacuum lines for the ones that go back to the wastegates (with the sheathing) or did you replace with some loom on them. Found multiple little leaks on these old vacuum lines and a big one on the brake booster (elbow) on the firewall. My hopes are getting it all done next weekend and wanted to buy enough parts up front. Thanks again for your input.
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      03-08-2015, 06:15 PM   #8
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EvlShiftrE92.....Thanks for the pics....Mine was also shot, lol.
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      03-10-2015, 03:03 PM   #9
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Originally Posted by RU QWKR View Post
fmonteiro444, do I need to go factory vacuum lines for the ones that go back to the wastegates (with the sheathing) or did you replace with some loom on them. Found multiple little leaks on these old vacuum lines and a big one on the brake booster (elbow) on the firewall. My hopes are getting it all done next weekend and wanted to buy enough parts up front. Thanks again for your input.
I ordered mine from ECS. I just did all silicon.
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      03-19-2015, 09:11 PM   #10
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All fixed and running like a top. Had to get a different spring in the BOV because I am at altitude, but all is well. Thanks for the help.
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      03-19-2015, 11:18 PM   #11
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We're you able to get more vaccuum? Or did you just replace the spring?

I had to use a 10psi spring in mine because it wouldn't open fast enough with the 10psi spring. Buy I'm at sea level.
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