Datalog Replaced lpfp worked for 3 days now wont start.

ididsomething

New Member
Dec 4, 2022
6
0
0
Ride
2008 bmw e90 335xi n54 MT
It worked for a couple of days now no start. This is a log of it not starting. It’s on stage 2+, fbo. I also have a log from the day I installed the lpfp if you want to see it.

 

Z4Dude

Lurker
Feb 7, 2025
17
3
0
GA
Ride
M340i and E89 Z4
If you turn your RPM and Boost off in the graph and then turn on your Low pressure fuel sensor and your Rail pressure they are essentially the same .. doesn't look like your HPFP is working - it should be far above the LP reading.... maybe at a minimum of about 1500-2500?

Are you getting any codes and have you double checked the connections to your HPFP? I dont think your injectors have enough pressure to fuel the cylinders.
 

ididsomething

New Member
Dec 4, 2022
6
0
0
Ride
2008 bmw e90 335xi n54 MT
Here is the log just after replacing the lpfp.