[Saif2018]

Originally Posted by LaCross

im at 430-480, lpfp is at 80psi. Bad hpfp?

LPFP is low pressure fuel pump, 80psi is good.

HPFP is shown as Rail pressure in Logs, it should be between 1500-2000 under WOT.

[Black_n54]

Originally Posted by onbacardi501

hey everyone, first post ever i was wondering if someone could help..

i have a bmw 135i N54 DCI bmw performance exhaust and COBB stage1
and i have noticed sometimes after some WOT runs all the way to redline when i come to a complete stop after 10 seconds the HPFP shoots up to 2,200 PSI and sits there and after 10 seconds the injector(s) start to tick louder like its being put under enormous pressure without the fuel being used.
the car idles OK no other sounds or noises that i can hear besides the louder injector tick after the HPFP PSI shoots up to over 2k

Originally Posted by onbacardi501

hey everyone, first post ever i was wondering if someone could help..

i have a bmw 135i N54 DCI bmw performance exhaust and COBB stage1
and i have noticed sometimes after some WOT runs all the way to redline when i come to a complete stop after 10 seconds the HPFP shoots up to 2,200 PSI and sits there and after 10 seconds the injector(s) start to tick louder like its being put under enormous pressure without the fuel being used.
the car idles OK no other sounds or noises that i can hear besides the louder injector tick after the HPFP PSI shoots up to over 2k

Hey I'm having this same issue did you get it figured out

[JM98]

Originally Posted by Black_n54

Hey I'm having this same issue did you get it figured out

My car has done this for the past 5 years, from what I gather its pretty normal. I've seen this come up a few times on the forums, and nobody has been able to give an answer to why it does this, but the car runs great no issues so I ignore it.

[SJM67]

my lpfp reads 94.85 at idle and stays there even at WOT...been this way for awhile now...car runs normal and hpfp reads 700 ish at idle...what could cause this?

[Dave92N54]

Originally Posted by SJM67

my lpfp reads 94.85 at idle and stays there even at WOT...been this way for awhile now...car runs normal and hpfp reads 700 ish at idle...what could cause this?

probably lpfp sensor, when mine went out I read about 50psi all the time, sometimes as low as 25. New lpfp, stayed the same, new sensor and now I read about 82psi most of the time, which from what i've read seems to be fine and somewhat normal for brand new pumps

[Mr.goya]

Originally Posted by SJM67

my lpfp reads 94.85 at idle and stays there even at WOT...been this way for awhile now...car runs normal and hpfp reads 700 ish at idle...what could cause this?

Did u find the issue?? 2009 bmw 535xi, getting code 29f3 with 94.282 low pressure fuel value and high rail pressure value fluctuating from 680-750psi at idle

[Dave92N54]

Originally Posted by Mr.goya

Did u find the issue?? 2009 bmw 535xi, getting code 29f3 with 94.282 low pressure fuel value and high rail pressure value fluctuating from 680-750psi at idle

Replace your lpfp sensor.

Part number: 13537622231

[_N54]

Mine is around the low 700's at idle.

[xuzax]

Mine revving in park drops below 700. But when I get out there at half open throttle it gets to 2500 easy peasy. I doubt that’s the reason for my vehicle missing until warm