MHD Issues

Jkc19delta

New Member
Nov 7, 2024
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First Post!
Link to datazap (80% throttle towards the end of the log, beginning was backing out of the driveway and heading to end of the street)

FBO M-Sport 08 E90 N54 AT, VRSF 3” catless DP, VRSF Charge pipe w/ tial bov, VRSF street exhaust, BMS DCAI, BMS OCC, ARM 7” FMIC, VRSF silicone 3” inlets, one step colder NGK spark plugs gapped to .022, Eldor coils, and recent walnut blast (coils, plugs and walnut blast <200 miles). Recently changed boost solenoids and all vacuum lines at the same time as the walnut blast.

Initially, I flashed my car to MHD V10 Stage 2+ 93 Oct as that was the fuel I was running. The car ran fine on my way to work; however, after work (about 9 hours later), the car was struggling to accelerate. On a relatively straight backroad, I wanted to take a log to see what was going on; when I went WOT in 3rd, the car went into Limp Mode almost instantly, so I pulled off to the side to turn it off and back on. After turning it back on, the car idled for all of 30 seconds (generous length), and then RPMs fell to 0. I cleared codes with only ignition on and made it back home. Earlier today, I reflashed to Stage 2+ 91 Oct and reset adaptations. After doing so, the car ran fine for about a minute (very generous) and then went back to struggling (also a metallic sound coming from underneath the passenger seat area). I went to take a test drive, and the car was stuttering whenever I depressed the throttle; it’s very jerky, and it also seems like it’s struggling to make a boost.

I’m sorry about the poor quality of the log. I was honestly scared to go WOT. After flashing, I encountered these issues and read on various other forums and posts that I should reset all adaptations minus the battery. I did this, and the car improved for about 20 seconds, and then the rail pressure dropped significantly. At 80% throttle, my rail pressure was under 800psi, which, from reading other posts, is way under the 1500-2000psi target. The LPFP was sitting between 70-80psi, which I gathered is pretty standard. My main question is whether I should replace the sensor or the entire HPFP? Or do y'all think it could be something else entirely? Should I flash it to the stock map? I included my current codes and the codes that were present before reflashing and resetting adaptations.

Current Codes:
2AAF - DME: Fuel pump, plausibility;
2DED - DME: Power management, closed-circuit current violation

Codes before reflashing and resetting adaptations:
2FCA - Fuel high pressure bei Freigabe der Einspritzung;
2FDA - Fuel high pressure bei order nach Freigabe der Einspritzung (2. Umweltbedingungssatz nach Zeitverzoegerung);
2FDB - Fuel high pressure nach Freigabe der Einspritzung;
29E2 - DME: Fuel injector rail, pressure-sensor signal