Help with injection cutout

[Joel I]

Hey guys.

First time I post car related stuff in forum so bare with me here.

I seek some guidance with my BMW E91 335I N54 2007
Running MHD Stage 2+ 98 RON
Last year I installed -1 NGK sparks with 0,022 GAP at the same time I installed catless DP and FMIC.
The dealer where I bought the car changed the coils during 2020.
HPFP has been changed 1 time about 70,000km ago.
Sometimes when I give moderate throttle or do WOT on 3rd gear or higher gears, I am getting engine light and lose all the power. I managed to make a log when this happens and I could see that my LPFP is fluctating alot, maybe someone could confirm. I do not know the status of LPFP or if it's changed before. But is this a pressure problem or a voltage problem? And is this fluctate the problem of Injection Cutout?
I see LPFP jumping from 35 up to 145 PSI and also see HPFP going down when this happen.

If you have any other notices about the logs or you see something else that maybe should be looked into, please let me know
The log is from earlier this year since I have not been driving very much due to a new car but now I am give this car some lovin'

Thanks!
/Joel

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[SLOWESTN54]

I wouldn't drive that car until you install a new HPFP. It's tanking all the way down to 400psi when floored. Your LPFP looks weak as well.

 

[NoGuru]

Both the LPFP and HPFP are falling off hard. I would not do any more pulls until you replace one and test or both.

lol, Slowest beat me to it.

 

[SLOWESTN54]

Both the LPFP and HPFP are falling off hard. I would not do any more pulls until you replace one and test or both.

lol, Slowest beat me to it.

lol, Long time no see Guru. But the since we both said it you know its serious.

 

[Joel I]

Thanks for the input guys!
The HPFP is bad as well? I thought this could be a result of a weak LPFP if it can't keep the flow of fuel.
I order a new LPFP then and try first since it needs to be changed then

 

[SLOWESTN54]

Thanks for the input guys!
The HPFP is bad as well? I thought this could be a result of a weak LPFP if it can't keep the flow of fuel.
I order a new LPFP then and try first since it needs to be changed then

I would start with HPFP, personally i think your hpfp is almost dead and its bringing the lpfp down with it.

 

[Joel I]

Alright, thanks!
I will start with the HPFP then but probably change both anyways since I do not know the history of the LPFP.

 

[SLOWESTN54]

Alright, thanks!
I will start with the HPFP then but probably change both anyways since I do not know the history of the LPFP.

For the lpfp if you plan on running ethanol I’d diy install a Walbro 535.

 

[Joel I]

For the lpfp if you plan on running ethanol I’d diy install a Walbro 535.

Heya,

Just wanted to let you know that I changed the HPFP and it running like a freakin' dream right now!
Thanks for the suggestion of changing the HPFP first, the LPFP looking fine according to the log.
What do you think?

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[SLOWESTN54]

Heya,

Just wanted to let you know that I changed the HPFP and it running like a freakin' dream right now!
Thanks for the suggestion of changing the HPFP first, the LPFP looking fine according to the log.
What do you think?

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Glad it worked out, If possible maybe switch to a lower octane fuel to clean up timing corrections post shift, is your car AT or a Manual car?

 

[Joel I]

Glad it worked out, If possible maybe switch to a lower octane fuel to clean up timing corrections post shift, is your car AT or a Manual car?

My car is manual. I am running MHD Stage 2 RON 98 right now which is like 93 OCT if I remember correctly. What do you mean I should use lower octane fuel? The only step down I have is RON 95 but that would require a reflash with the other map I believe.

 

[SLOWESTN54]

My car is manual. I am running MHD Stage 2 RON 98 right now which is like 93 OCT if I remember correctly. What do you mean I should use lower octane fuel? The only step down I have is RON 95 but that would require a reflash with the other map I believe.

Sorry, i meant as in lower the octane in mhd, but still use 98 RON. Or try switching gas stations maybe. Just getting a lot of corrections in 4th.

 

[Joel I]

Sorry, i meant as in lower the octane in mhd, but still use 98 RON. Or try switching gas stations maybe. Just getting a lot of corrections in 4th.

Ah I see. So to confirm, I reflash the ECU with Stage 2 95 RON but keep fueling 98 RON?

 

[SLOWESTN54]

Ah I see. So to confirm, I reflash the ECU with Stage 2 95 RON but keep fueling 98 RON?

Yes. Then take another log to see if your still getting corrections.

 

[Joel I]

Yes. Then take another log to see if your still getting corrections.

Awesome! Thanks for the help, really appreciate it. I reflash and take another log and post it here afterwards

 

[SLOWESTN54]

Awesome! Thanks for the help, really appreciate it. I reflash and take another log and post it here afterwards

Yea no worries, let us know if that fixes your timing corrections.

 

[Joel I]

Yea no worries, let us know if that fixes your timing corrections.

So I reflashed the DME, drove about 30km so the car was warm and then did a pull in 3rd and 4th gear. But now it looks like it got more corrections then before. However, I flashed it to Stage 2+ this time, it was "only" on stage 2 in earlier log (Tho first log was in Stage 2+ as well).
Could it be something else causing the corrections? It runs very good when driving with the new pump tho

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[SLOWESTN54]

So I reflashed the DME, drove about 30km so the car was warm and then did a pull in 3rd and 4th gear. But now it looks like it got more corrections then before. However, I flashed it to Stage 2+ this time, it was "only" on stage 2 in earlier log (Tho first log was in Stage 2+ as well).
Could it be something else causing the corrections? It runs very good when driving with the new pump tho

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Possibly you can try new spark plugs. Do you know the amount of Km's or miles you've done on your current set.

 

[Joel I]

Possibly you can try new spark plugs. Do you know the amount of Km's or miles you've done on your current set.

The spark plugs have about 15000 km and the coils have about 20000 km.

 

[SLOWESTN54]

The spark plugs have about 15000 km and the coils have about 20000 km.

I'd pull the plug in the cylinder with the most corrections and inspect it, also check the gap. Also, try switching fuel stations to see if it makes a difference.