N55 stalling at start, not hitting target boost

[noice135]

Hey guys,

I currently own a 2011 135i DCT.

FBO
wedge tuned
stage 1 pure turbo
91oct tune

I am having the weirdest trouble with this car I need some help!

car has 125k miles

It started off by stalling on me on a cold start, I put the car into gear, and when I reached a stop, it died. I started it back up and drove just fine.

Later that day, I went to turn it on and it stalled again right after turning it on.

I did some data logs and to be completely honest I have no idea what I am looking at, but there is some MAJOR timing corrections, I am not hitting my boost target and the car just seems to stop and drive funky. I don't know what to do, I called BMW and they think its a boost leak, or a HPFP issue.

However the fuel rail pressure seems fine.

this is a 3rd gear pull
https://datazap.me/u/alxsantan/log-1...30-31-32-33-34

what do you guys think?

[noice135]

here is another run for reference

https://datazap.me/u/alxsantan/log-1...30-31-32-33-34

[noice135]

log on cold start

https://datazap.me/u/alxsantan/log-1...?log=0&data=17

[noice135]

actual start

https://datazap.me/u/alxsantan/log-1...og=0&data=7-17

[iminhell1]

Need fuel pressure

Boost looks fine. Nothing wrong there.

[noice135]

Originally Posted by iminhell1

Need fuel pressure

Boost looks fine. Nothing wrong there.

I don't have a fuel pressure gauge, but my fuel rail gauge seems to be fine.

I'm stumped

[noice135]

Here is a log where it died


https://datazap.me/u/alxsantan/log-1632026190?log=0&data=4-19

[katsooba]

about a year ago i had the same issues, turns out my rail fuel pressure sensor died

this is the part number 13537620946

it is cheap enough and an easy swap for you to not try it.

just put a towel under the sensor when you take it out to absorb some of the fuel that will drip out

[noice135]

Originally Posted by katsooba

about a year ago i had the same issues, turns out my rail fuel pressure sensor died

this is the part number 13537620946

it is cheap enough and an easy swap for you to not try it.

just put a towel under the sensor when you take it out to absorb some of the fuel that will drip out

Did yours show good fuel pressure like mine does?

I am ordering it now just incase. Figure I will start with the small stuff

[carcar123454321]

I know this is old, but what turned out to be the issue?