[JoshApple]

Hello my name is Josh Appleberg and I have an 07 335i with 117k miles. I've been playing around with MHD datalogging and have been coming to this problem every time. When I do a datalog from 3k-6k rpms in 3rd gear, my boost target and boost are around 6-8 every single time. I took it to a shop a while back to get my car looked over after I changed the turbos and they said they were able to get it to 20psi when they logged it. I'm not sure why I'm not able to replicate that with my own logs. Was wondering if anybody had any ideas as to why this is happening. How does my log look otherwise? Specifically with fuel pressure as I have had some fuel related codes recently.

Ill post a pic of a log that I did today, March 1st, and also ill attach the link to the the datazap page if it works

Any insight would be greatly appreciated as I am new to datalogging

P.S. No Boost related fault codes at all

https://datazap.me/u/japple7/march-1?log=0&data=3-4-21

Mod/parts:
Vargas Stage 1 upgrade w/ Upgraded billet wheel
Silicone inlets
DCI
FMIC
BOV
Upgraded charge pipe

[Bimmer_Bro]

Originally Posted by JoshApple

Hello my name is Josh Appleberg and I have an 07 335i with 117k miles. I've been playing around with MHD datalogging and have been coming to this problem every time. When I do a datalog from 3k-6k rpms in 3rd gear, my boost target and boost are around 6-8 every single time. I took it to a shop a while back to get my car looked over after I changed the turbos and they said they were able to get it to 20psi when they logged it. I'm not sure why I'm not able to replicate that with my own logs. Was wondering if anybody had any ideas as to why this is happening. How does my log look otherwise? Specifically with fuel pressure as I have had some fuel related codes recently.

Ill post a pic of a log that I did today, March 1st, and also ill attach the link to the the datazap page if it works

Any insight would be greatly appreciated as I am new to datalogging

P.S. No Boost related fault codes at all

https://datazap.me/u/japple7/march-1?log=0&data=3-4-21

Mod/parts:
Vargas Stage 1 upgrade w/ Upgraded billet wheel
Silicone inlets
DCI
FMIC
BOV
Upgraded charge pipe

What tune are you running? You are exactly on target for what the ecu is asking for.

[Dave92N54]

6-8 is perfectly normal for a stock tune. If they were logging 20+, it either had a custom tune, or was overboosting. Not even MHD stage 2+ targets 20psi. That's quite a bit.

[JoshApple]

Originally Posted by Dave92N54

6-8 is perfectly normal for a stock tune. If they were logging 20+, it either had a custom tune, or was overboosting. Not even MHD stage 2+ targets 20psi. That's quite a bit.

Okay that makes much more sense. Wasn't sure what the stock target was. Now that you mention that, I don't have a tune at the moment but plan to get one in the near future. Kind of crazy why's being left on the table with stock tune/boost target.

Any word on fuel pressure readings?

[Bimmer_Bro]

Originally Posted by JoshApple

Okay that makes much more sense. Wasn't sure what the stock target was. Now that you mention that, I don't have a tune at the moment but plan to get one in the near future. Kind of crazy why's being left on the table with stock tune/boost target.

Any word on fuel pressure readings?

Since you have silicone turbo inlets you will want to get a custom tune when the time comes. The MHD off the shelf tunes do not account for having turbo inlets. That being said, some users haven't had an issue.
I'm no expert but your low pressure fuel pump
Might be getting a bit weak. Seems to dip into the 60s during your pull.

[Saif2018]

Originally Posted by Bimmer_Bro

Since you have silicone turbo inlets you will want to get a custom tune when the time comes. The MHD off the shelf tunes do not account for having turbo inlets. That being said, some users haven't had an issue.
I'm no expert but your low pressure fuel pump
Might be getting a bit weak. Seems to dip into the 60s during your pull.

+1

OP needs custom tune to take good advantage of build, wouldn't be a bad idea to upgrade lpfp, although if it doesn't drop into the 50's it should be fine.

[JoshApple]

Originally Posted by Saif2018

+1

OP needs custom tune to take good advantage of build, wouldn't be a bad idea to upgrade lpfp, although if it doesn't drop into the 50's it should be fine.

I guess it's worth mentioning that I have reason to believe that the low pressure fuel pump is definitely not working properly to some extent.

First, I have a gas misreading on my dash. Already replaced fuel pressure regulator on driver side and have read that there are two separate gas reading floaters on each side and I believe the LPFP one must be broken or something.

Second, my car leaks gas after I fill it up completely for probably the first 25-50 miles. Had the shop look at it and they concluded it is most likely coming from lock ring on LPFP or around that area (they weren't very specific).

Third, I'm not certain that this is related, but, when I cruise at about 90 mph, if I decide to let off the gas to slightly decelerate, my car goes wack and starts like stuttering or hesitating. Rpms will have micro fluctuations that cause my car to feel like it's kind of jumping back and forth. Very odd but could possibly be lack of fuel from LPFP?

[Dave92N54]

Originally Posted by JoshApple

I guess it's worth mentioning that I have reason to believe that the low pressure fuel pump is definitely not working properly to some extent.

First, I have a gas misreading on my dash. Already replaced fuel pressure regulator on driver side and have read that there are two separate gas reading floaters on each side and I believe the LPFP one must be broken or something.

Second, my car leaks gas after I fill it up completely for probably the first 25-50 miles. Had the shop look at it and they concluded it is most likely coming from lock ring on LPFP or around that area (they weren't very specific).

Third, I'm not certain that this is related, but, when I cruise at about 90 mph, if I decide to let off the gas to slightly decelerate, my car goes wack and starts like stuttering or hesitating. Rpms will have micro fluctuations that cause my car to feel like it's kind of jumping back and forth. Very odd but could possibly be lack of fuel from LPFP?

Well first address the leak. I actually recently came across a thread on here about probably what you're experiencing. Check if you've rubbed a hole in your filler neck, I believe for most it occurs in the rear passenger wheel well. Any kind of a leak would cause some issues. If you have a leak and it's still not dropping below 60psi i'd find it hard to believe the pump is bad. As for the gas level, the floater could just be stuck.

Edit: wait they said from the lock ring on the pump? So it's leaking inside the vehicle??

Edit2: Decided to look at your log myself. Everything looks pretty good although your stft are pretty high. At -20% you're pulling a lot of fuel. What injectors do you have?

[stewbets]

Originally Posted by JoshApple

I guess it's worth mentioning that I have reason to believe that the low pressure fuel pump is definitely not working properly to some extent.

First, I have a gas misreading on my dash. Already replaced fuel pressure regulator on driver side and have read that there are two separate gas reading floaters on each side and I believe the LPFP one must be broken or something.

Second, my car leaks gas after I fill it up completely for probably the first 25-50 miles. Had the shop look at it and they concluded it is most likely coming from lock ring on LPFP or around that area (they weren't very specific).

Third, I'm not certain that this is related, but, when I cruise at about 90 mph, if I decide to let off the gas to slightly decelerate, my car goes wack and starts like stuttering or hesitating. Rpms will have micro fluctuations that cause my car to feel like it's kind of jumping back and forth. Very odd but could possibly be lack of fuel from LPFP?

I don't think there's anything wrong with the LPFP itself. There could very well be a float issue. There's only one and it's on the LPFP. The HPFP also looks good. Your fuel trims are a little concerning though. They go from way positive to way negative throughout the pull. Can you also log you LTFT's to see where they're at? It would also be a good idea to get a log of this stuttering that takes place on deceleration. It doesn't seem like it would be fuel pump related. If your gas tank was leaking from the lock ring, you would have a very strong smell in your car.

[iqraceworks]

Originally Posted by Dave92N54

6-8 is perfectly normal for a stock tune. If they were logging 20+, it either had a custom tune, or was overboosting. Not even MHD stage 2+ targets 20psi. That's quite a bit.

I'm pretty sure my MHD V5 Stage 2+ E40 tune targets 21psi, and then starts to taper off as the rpms climb........I'd love to put the car on a dyno and see how much power it's making. That tune is night and day more powerful vs any of the stage 2+ 93 tunes.

[JoshApple]

Originally Posted by Dave92N54

Well first address the leak. I actually recently came across a thread on here about probably what you're experiencing. Check if you've rubbed a hole in your filler neck, I believe for most it occurs in the rear passenger wheel well. Any kind of a leak would cause some issues. If you have a leak and it's still not dropping below 60psi i'd find it hard to believe the pump is bad. As for the gas level, the floater could just be stuck.

Edit: wait they said from the lock ring on the pump? So it's leaking inside the vehicle??

Edit2: Decided to look at your log myself. Everything looks pretty good although your stft are pretty high. At -20% you're pulling a lot of fuel. What injectors do you have?

I will check out the leak and post some photos if I can of where it's coming from. I will also check under rear passenger seat and see if I can see any visible leaks there. The shop wasn't very specific but that's what they said. Somewhere around the lock ring. Car stinks up my entire garage with a strong gas smell after I fill up as well.

I have index 12s, I changed them soon after I got my car becuase the others were giving up. Coded them properly myself and haven't had problems with them since.

Just read up about those fuel trims and I'm pretty new to it but it definitely sounds concerning. What are the possible causes or consequences of those fuel trims?

WORTH NOTING

I did have a problem in the past with fuel or oil being sent into my exhaust and caused all my cats to just become toast. Changed downpipes when I changed my turbos and the cats in the downpipes were completely gone. As for the secondary cats in the midpipe, I'm not entirely sure of the condition of them. Most likely are also gone, or partially gone. Could any of this play into those fuel trim problems?

I will make sure to post another log including LTFT and some other metrics and see.

EDIT: Also have had code 2A16 (fuel tank ventilation system and purge air system - micro-leak) pretty consistently for a while now just haven't gotten into fixing it yet.

Thanks a lot

[JoshApple]

Originally Posted by stewbets

I don't think there's anything wrong with the LPFP itself. There could very well be a float issue. There's only one and it's on the LPFP. The HPFP also looks good. Your fuel trims are a little concerning though. They go from way positive to way negative throughout the pull. Can you also log you LTFT's to see where they're at? It would also be a good idea to get a log of this stuttering that takes place on deceleration. It doesn't seem like it would be fuel pump related. If your gas tank was leaking from the lock ring, you would have a very strong smell in your car.

Check the reply I posted for Dave's comment. I will try to log again tomorrow and maybe even try to get a log of the stuttering as well.

Most of my other details I explained in my reply to Dave.

Thanks a lot

[JoshApple]

stewbets
Dave92N54

Here are some updated logs that include more relevant details.

1- First attempt 90 Deceleration to capture stuttering

https://datazap.me/u/japple7/first-9...?log=0&data=21

2- Second attempt 90 Deceleration to capture stuttering

https://datazap.me/u/japple7/2nd-90-decel?log=0&data=21

3- WOT w/ LTFT

https://datazap.me/u/japple7/wot-log...?log=0&data=21



Filled up my tank and couldn't see it leaking this time around.

Will attach the pictures I took around LPFP Lock Ring. It is wet but from not sure from where. Some weird crud material in the housing area.

[Tyc0]

I'd bet your lock ring has rusted away. Is it possible someone touched your lpfp and in the process got the floater caught all while somehow ruining the lock ring causing it to leak ? Just a guess

[stewbets]

Originally Posted by JoshApple

I will check out the leak and post some photos if I can of where it's coming from. I will also check under rear passenger seat and see if I can see any visible leaks there. The shop wasn't very specific but that's what they said. Somewhere around the lock ring. Car stinks up my entire garage with a strong gas smell after I fill up as well.

I have index 12s, I changed them soon after I got my car becuase the others were giving up. Coded them properly myself and haven't had problems with them since.

Just read up about those fuel trims and I'm pretty new to it but it definitely sounds concerning. What are the possible causes or consequences of those fuel trims?

WORTH NOTING

I did have a problem in the past with fuel or oil being sent into my exhaust and caused all my cats to just become toast. Changed downpipes when I changed my turbos and the cats in the downpipes were completely gone. As for the secondary cats in the midpipe, I'm not entirely sure of the condition of them. Most likely are also gone, or partially gone. Could any of this play into those fuel trim problems?

I will make sure to post another log including LTFT and some other metrics and see.

EDIT: Also have had code 2A16 (fuel tank ventilation system and purge air system - micro-leak) pretty consistently for a while now just haven't gotten into fixing it yet.

Thanks a lot

How long has it been since you changed out your injectors? Your STFT's and LTFT's are mirroring each other, maxed out in opposite directions, so I'd reset the trim adaptations and give them a fresh start. I don't see any issues with either of your fuel pumps. Your 2A16 code is consistent with your leaking lock ring. What I would do is drive it till you have less than 1/4 tank and then pound off that lock ring, inspect the LPFP float and put on a new lock ring. Do you know if the O2 sensors have been replaced? I wouldn't be surprised if whatever destroyed your cats also damaged the sensors and they're not reporting accurately. This could be the cause of your stuttering.

[JoshApple]

Originally Posted by stewbets

How long has it been since you changed out your injectors? Your STFT's and LTFT's are mirroring each other, maxed out in opposite directions, so I'd reset the trim adaptations and give them a fresh start. I don't see any issues with either of your fuel pumps. Your 2A16 code is consistent with your leaking lock ring. What I would do is drive it till you have less than 1/4 tank and then pound off that lock ring, inspect the LPFP float and put on a new lock ring. Do you know if the O2 sensors have been replaced? I wouldn't be surprised if whatever destroyed your cats also damaged the sensors and they're not reporting accurately. This could be the cause of your stuttering.

I replaced injectors soon after I bought the car and made them all index 12's, I would guess somewhere around Aug-Sep 2019. I will give that a shot and see what happens.

When I changed my turbos, one of the pre-cat o2's was literally fried. I'll attach the picture I took of it but I replaced it. The other one seemed to be fine and I was tight on cash at that time so I just replaced the visually compromised one.

Edit: So to answer your question, I have replaced the one pictured being one of the Precat ones. The other 3 have not been replaced.

Is it possible to reset fuel trim adaptations in MHD? If not I can hook up INPA and do it that way.

Thanks for all the help I appreciate it!!

stewbets

[stewbets]

Goodness, that IS fried! I think there's reason to believe the others may also be compromised. I was hesitant about replacing my O2 sensors for a while, but it made a huge difference. I wasn't getting codes for them either. And yes, you can reset trims with MHD. Just select both lambda options from the adaptations menu.

[Dave92N54]

To me that leak looks like it's coming from the hose with the 90 degree elbow, not the actual lock ring. It looks like the leak is landing in top of it, not coming out from under.

If you have the MHD flasher module you can reset adaptations, otherwise INPA.

[stewbets]

Originally Posted by Dave92N54

To me that leak looks like it's coming from the hose with the 90 degree elbow, not the actual lock ring. It looks like the leak is landing in top of it, not coming out from under.

If you have the MHD flasher module you can reset adaptations, otherwise INPA.

Good call, I can see that now.

[JoshApple]

@Dave92N54
stewbets

Lolol yeah I said the same thing when I saw that thing. Will reset adaptations and see how that feels. Should definitely look into replacing atleast the other Pre-Cat 02.

I thought the same thing when I saw it but I was playing with that hose and didn't seem to see any visual leak from it anywhere. Jiggled it around and felt underneath it and was fine. Will keep watching it