Sputtering/misfire cyl.1 couldn’t be fuel pump?

[Tonynotoes]

I noticed my car was sounding different when I accelerated hard and felt a loss of power from 4-5k rpm for a few weeks, maybe even a month. plugged in a few days ago and it was saying cylinder 1 misfire, with no other info. a couple days later I topped up the coolant a small amount and everything went back to normal, I really think that is a Coincidence but my car was pulling like a train again. I’m stuck, I’ve ordered an MHD scanner, here’s the LPFP log. Please if anyone could help

If anyone has any sort of ideas or has the same problem let me know. Me and my mechanic are struggling because the codes are useless and I don’t want to throw £££ at it if I don’t know what the issue is.

Some info on the car itself

2006 e92 bmw 335i 135k miles

MHD stage 2

Turbos replaced with oem bmw 130k

 

[Tonynotoes]

I went out and got you a picture of those. The black wired one should be on the front connector and the grey should be on the back one. My car doesn't have second one since I'm running single turbo.View attachment 96103

Hey bro, unplugged these today, drove smooth, should I do a log? Done logs before unplugging these and the lpfp is looking weird.

 

[odesh]

Hey bro, unplugged these today, drove smooth, should I do a log? Done logs before unplugging these and the lpfp is looking weird.

Hi,

Did you figure out the problem? I haven't been active since I was on work trip over seas. Sorry for that.

 

[Tonynotoes]

Hi,

Did you figure out the problem? I haven't been active since I was on work trip over seas. Sorry for that.

Hey bro, disconnected the sensors. Still gettin the issue. But I’ve noticed on the logs the fuel pump dropping to 40-50psi which I don’t think is good at all. Will send the logs on here. Lmk if u have any ideas or see anything that doesn’t make sense on the logs bro, hope you’re well. Thanks for replying haha

Log-07-22-2024-17-42-58

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Log-07-22-2024-17-43-35

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Log-07-22-2024-17-46-33

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[odesh]

Hey bro, disconnected the sensors. Still gettin the issue. But I’ve noticed on the logs the fuel pump dropping to 40-50psi which I don’t think is good at all. Will send the logs on here. Lmk if u have any ideas or see anything that doesn’t make sense on the logs bro, hope you’re well. Thanks for replying haha

Log-07-22-2024-17-42-58

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Log-07-22-2024-17-43-35

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Log-07-22-2024-17-46-33

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Yeah, you are right. The low pressure pump seems to be going down and bringing the rail pressure dangerously low as well.

Are you still running the original fuel pump?

 

[Tonynotoes]

Yeah, you are right. The low pressure pump seems to be going down and bringing the rail pressure dangerously low as well.

Are you still running the original fuel pump?

Yes bro never been changed I don’t think. I deffo haven’t done it. All my mates been telling me it the fuel pump the whole time haha. But I think because I reset all adaptations it started working again for a few weeks. What do u think I should do? Replace? Walbro 450? Hopefully this means I don’t need to upgrade the hpfp as well anything else catching your eye? Gotta put her in the garage soon for steering rack and oil leak so just gonna buy the fuel pump and do it all at the same time..

 

[odesh]

Yes bro never been changed I don’t think. I deffo haven’t done it. All my mates been telling me it the fuel pump the whole time haha. But I think because I reset all adaptations it started working again for a few weeks. What do u think I should do? Replace? Walbro 450? Hopefully this means I don’t need to upgrade the hpfp as well anything else catching your eye? Gotta put her in the garage soon for steering rack and oil leak so just gonna buy the fuel pump and do it all at the same time..

Your HPFP should be fine. Could you get an used fuel pump from somewhere? Would be a shame to buy 450 just to find out that it's not the problem :/

 

[Tonynotoes]

Your HPFP should be fine. Could you get a used fuel pump from somewhere? Would be a shame to buy 450 just to find out that it's not the problem :/

Even if it’s not the pump it will still need it it eventually. Worst case could be the injectors? I’m gonna order the walbro/sparks and coils first, see if that sorts the problem . Hopefully should get that done over the next few days.

 

[Tonynotoes]

Even if it’s not the pump it will still need it it eventually. Worst case could be the injectors? I’m gonna order the walbro/sparks and coils first, see if that sorts the problem . Hopefully should get that done over the next few days.

Also here’s another log from today, lpfp is going from 72psi when normal driving and 45psi when high rpm then to 80+psi after the pull. Strange. Lmk if u see anything different

Log-07-24-2024-16-49-07

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[AzNdevil]

Also here’s another log from today, lpfp is going from 72psi when normal driving and 45psi when high rpm then to 80+psi after the pull. Strange. Lmk if u see anything different

Log-07-24-2024-16-49-07

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car is in open loop, o2 sensor readings are stuck and stft hasnt completed learning cycle stuck at 0. drive more and take a log

 

[Neophyte]

car is in open loop, o2 sensor readings are stuck and stft hasnt completed learning cycle stuck at 0. drive more and take a log

View attachment 97630

o2 sensors are still unplugged. Same as post #43

 

[wheela]

Hey bro, disconnected the sensors. Still gettin the issue. But I’ve noticed on the logs the fuel pump dropping to 40-50psi which I don’t think is good at all. Will send the logs on here. Lmk if u have any ideas or see anything that doesn’t make sense on the logs bro, hope you’re well. Thanks for replying haha

Log-07-22-2024-17-42-58

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Log-07-22-2024-17-43-35

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Log-07-22-2024-17-46-33

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What sensors did you unplug?