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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications N63 with Low boost until 4K rpms
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      09-22-2018, 05:55 PM   #1
Morebs4me
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N63 with Low boost until 4K rpms

My exhaust flappers don’t seem to be operating properly either but when I checked those vacuum lines, they are holding vacuum fine. If I disconnect my wastegate vacuum line and try to apply vacuum to the hose, should it hold vacuum with the car off? Neither wastegate lines do, and I haven’t tested with the car running to see.

I forgot to mention during logs, there are no codes and the dme seems to not be commanding boost until 3500-4K rpms.
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      09-22-2018, 07:43 PM   #2
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You would have a low boost fault if it were running even slightly lower then it should be. When you say holding vacuum, which direction are you going? If you do a vacuum into the wastegate actuator it will not bleed down.
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      09-22-2018, 08:22 PM   #3
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I was testing the vacuum line that runs from boost solenoids to wastegate not the actual wastegate itself.
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      09-23-2018, 02:29 PM   #4
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Go to the vacuum pump and pull the line off and pull a vacuum into the whole system and see if it holds or leaks if you suspect a vacuum leak
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      09-23-2018, 07:33 PM   #5
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Will it hold even if the solenoid is leaking and where is the vacuum pump
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      09-24-2018, 11:12 AM   #6
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Vaccum pump is on the rear of passenger cylinder head behin airbox. pull passenger side airbox
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      09-26-2018, 07:34 PM   #7
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Oops I tested the line I got from the vacuum pump not realizing what it was. I’m gonna change solenoids and see if It helps.
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      09-27-2018, 01:49 AM   #8
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Have you checked the lines? Easiest way is to take the line off the vacuum pump and blow into it. It should feel like blowing into a straw when you have the other side covered. If you hear air escaping or can continue to blow, then you know you have a leak. From there trace the lines, It goes from the vacuum pump to the reservoir and splits from there to each boost solenoid. My lines were destroyed (splitting at the ends) and my car wouldn’t build boost. It didn’t throw any fault codes.
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      09-27-2018, 08:38 PM   #9
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Originally I was testing to see if my exhaust flap had a leak so I disconnected the line I had to unscrew from the vacuum pump and applied vacuum and it held vacuum and opened my flaps in the mufflers. I’ve tested one boost solenoid but not the passenger side cause it’s harder to get to.
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      09-28-2018, 06:54 PM   #10
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      09-29-2018, 01:29 AM   #11
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One boost solenoid was shot, but the fun began after both were replaced. On tune only everything is good, but once jb4 gets involved bank 2 skyrockets. Map 1 on jb4 gets me 15 psi on bank 1 and 26 psi on bank 2. I already cleared adaptations and my wastegates were at most 1 inch of vacuum off, with bank 1 closing faster. I set them to close at 6-7inch of vac and thinking if I went too low.
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      10-04-2018, 09:46 AM   #12
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Quote:
Originally Posted by Morebs4me View Post
One boost solenoid was shot, but the fun began after both were replaced. On tune only everything is good, but once jb4 gets involved bank 2 skyrockets. Map 1 on jb4 gets me 15 psi on bank 1 and 26 psi on bank 2. I already cleared adaptations and my wastegates were at most 1 inch of vacuum off, with bank 1 closing faster. I set them to close at 6-7inch of vac and thinking if I went too low.
DId you check your diverter valves ? sounds like one might be broken.
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