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iqraceworks iqraceworks is offline
Junior Member
Posts: 57
Join Date: Sep 2019
Car: 355i
Exclamation 09-14-2021, 06:10 PM

Well....I gave it one more shot before I ordered a new HPFP. First, I checked all the plugs after the car sat all day...all dry and look fine (no leaky injectors). Then I hooked up MHD, got a log running, and fired up the car.

This time the HPFP never got above 50psi...the motor sputtered and coughed as it attempted to idle. After doing that for around 10 seconds, the HPFP came to life and the pressure sprung up to around 2,600psi and the motor started to idle normal.

At this point....I'm 110% sure it's a HPFP problem. I think something is jacked up with the built in fuel pressure regulator. I'm going to order a new one off of FCP Euro tonight, along with a new rail pressure sensor.

I will report back after the parts show up and I get to take the car for a test drive. :thumbsup:

Attached Files
File Type: csv HPFP pressure at idle_N20_RB2_93_v01.mhd.csv (36.4 KB, 19 views)

2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Down-p1pes, Bilstein B12 Prokit Suspension,G-Plus FMIC, MHD Stage 2+ tune, xHP stage 3 transmission flash.
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