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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 questions.



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      10-23-2014, 05:18 PM   #1
Scrippy
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Guys,

So I've replaced the following but I still see vacuum pressure dropping in front of my eyes when I turn engine off. My gauge is tapped in to the hose that leads to the exhaust flap. I removed the line going to exhaust and plugged in my meter. Here's what I've replaced.
1-both boost solenoids
2-all vacuum hose from hard pipe to SOLENOIDS and wastegates.
3-grommet in brake booster
4-hard line with valve that goes into the grommet.
5-all the rubber rings in hard pipe connections.
So at idle I'm at 25-26"Hg but after I turn car off it just drops and drops. After 3 minutes I'm at 15"Hg. Any ideas or does the system not hold all vacuum reliably with engine off.
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      10-23-2014, 05:47 PM   #2
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Check your brake booster with a vacuum pump. If it holds and doesn't lose vacuum it could be a wg actuator. I'm not 100% sure it should maintain vacuum but I would think it would.
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      10-23-2014, 06:05 PM   #3
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Originally Posted by Ingeniator
Check your brake booster with a vacuum pump. If it holds and doesn't lose vacuum it could be a wg actuator. I'm not 100% sure it should maintain vacuum but I would think it would.
I actually replaced my turbos and actuators too. Forgot to list that.
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      10-23-2014, 08:49 PM   #4
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I know it's not the actuators. I replaced them 2 months ago. I also tried removing the vac lines from the top of canisters and jumpered them together with a piece of vac line. This takes the solenoids and wastegates out of the equation. It still drops though.
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      10-23-2014, 09:11 PM   #5
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Quote:
Originally Posted by Scrippy View Post
I know it's not the actuators. I replaced them 2 months ago. I also tried removing the vac lines from the top of canisters and jumpered them together with a piece of vac line. This takes the solenoids and wastegates out of the equation. It still drops though.
Brake booster diaphragm?
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09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system
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      10-23-2014, 09:19 PM   #6
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Quote:
Originally Posted by Ingeniator
Quote:
Originally Posted by Scrippy View Post
I know it's not the actuators. I replaced them 2 months ago. I also tried removing the vac lines from the top of canisters and jumpered them together with a piece of vac line. This takes the solenoids and wastegates out of the equation. It still drops though.
Brake booster diaphragm?
Good lead! Thanx!
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      10-23-2014, 09:49 PM   #7
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Quote:
Originally Posted by Scrippy
Quote:
Originally Posted by Ingeniator
Quote:
Originally Posted by Scrippy View Post
I know it's not the actuators. I replaced them 2 months ago. I also tried removing the vac lines from the top of canisters and jumpered them together with a piece of vac line. This takes the solenoids and wastegates out of the equation. It still drops though.
Brake booster diaphragm?
Good lead! Thanx!
Please post your findings!
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      10-23-2014, 10:07 PM   #8
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Quote:
Originally Posted by Dmacc
Quote:
Originally Posted by Scrippy
Quote:
Originally Posted by Ingeniator
Quote:
Originally Posted by Scrippy View Post
I know it's not the actuators. I replaced them 2 months ago. I also tried removing the vac lines from the top of canisters and jumpered them together with a piece of vac line. This takes the solenoids and wastegates out of the equation. It still drops though.
Brake booster diaphragm?
Good lead! Thanx!
Please post your findings!
Will do, check back tomorrow and I'll have found out.
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