02-26-2022, 08:37 PM | #1 |
Enlisted Member
11
Rep 39
Posts |
Stock HPFP Crash on 91?
Looking for some input as I'm seeing my HPFP actual drop over 1k below target, logged in this 4th gear pull, WOT. I've been on BM3 OTS ST2 maps since 17k, now at 30k. Not long ago I started to notice misfires/stuttering above 5k RPM. I was thinking I had some low octane gas at first and I switched down to the 91ACN map from 91, which I typically run. This behavior remained persistent on new fuel, it appears more often with colder temps and high load.
Started logging as a result and noticed some inconsistencies, fuel pressure seems fine in the upper range but the midrange drop has me suspecting a weak factory HPFP or a possible issue with my LPFP? I had no stutters in the attached log but the HPFP drop is clear, AFR appears to be on target in the upper range. Am I lean down low? Wondering if anyone has dealt with a similar issue, I believe this car had a LPFP recall done that I can check into. No CELs are present. Trying to narrow this down before I pull the trigger on a new HPFP, I'd probably go with Dorch ST2 as I'm planning for more upgrades. https://www.bootmod3.net/log?id=61ff710bd10b437c875e4ac2 2014 335I: 30k -EWG/8SPD -BM3 ST2: MM1-91ACN -XHP ST3 -ER CP -ER DP -ER CIC -Dinan CAI -NGK Plugs |
02-27-2022, 05:52 PM | #2 |
Major General
4374
Rep 7,622
Posts |
Are you running multimap? Try a normal stage 1 or stage 2 91 octane map and log that. Any codes?
For some reason your STFTs are hugely negative, which doesnt make sense for an OTS pump gas map with pump gas. multimaps have some strange behavior sometimes, so try a normal map |
Appreciate
0
|
02-27-2022, 11:30 PM | #3 |
Car Hypochondriac
335
Rep 903
Posts
Drives: 2014 335i M-Sport Estoril Blue
Join Date: Feb 2017
Location: Sterling, VA
|
I am currently having the same issue, though my crash is not nearly that bad, only down to 2000, not below.
Reached out to PTF, they said the STFT dropping below 1 when fuel pressure drops is intended. Told me to upgrade hpfp, which I was already planning to do... So I finally pulled the trigger. Probably doing the install in the next two weeks.
__________________
Power mods: VRSF IC/Catted DP - FTP CP/BP - AFE Cat-back - BM3/XHP - Dorch S2
Handling mods: Koni yellow - Eibach prokit - Millway street - M Performance LSD - M3 brakes - EBC bluestuff Exterior: Euro LCI tail lights - Shitty ECS CF spoiler - Chinese M performance diffuser Interior: Bavsound stage 1 and subs - custom trunk sub by Mike1327 |
Appreciate
0
|
02-27-2022, 11:44 PM | #4 | |
Enlisted Member
11
Rep 39
Posts |
Quote:
Just flashed back to the standard ST2 91 AGG map which I previously ran and took a few quick logs. Not my best, dealing with torrential rain but I'm seeing nowhere near the same HPFP dip and STFTs appear normal. I'm a bit puzzled and will likely continue with more logs. If I have no actual HW issue and others have reported similar issues it must not be an intended result from the map? I haven't reached out to PTF yet but I'm surprised there would be such a variance. Next, I'll do some back to back logs when I can switch between the standard and multi-variant to reduce other variables. Stage 2 91OCT AGG: https://www.bootmod3.net/log?id=621c...0b4333683e6a56 https://www.bootmod3.net/log?id=621c...0b43355b119bc8 |
|
Appreciate
0
|
02-27-2022, 11:48 PM | #5 | |
Enlisted Member
11
Rep 39
Posts |
Quote:
|
|
Appreciate
0
|
02-28-2022, 10:21 AM | #6 |
Private
54
Rep 68
Posts |
I am dealing with exactly the same issue right now. 2014 335i RWD as well with same symptoms. Since switching to Stage 2 multi map ACN91 I am getting sputtering at 5000+ rpm in 3rd. Logs showed the HPFP dropping to as low as 1400 on a target of 2450. AFR going as rich as 11.3:1. I thought my ethanol mix was off as I was mixing to E20 to clean up timing with my crappy AZ fuel. But, cleaned out with Chevron 91 for a couple of tanks and still had the issue.
Reached out to PTF and they asked for a 3-4 gear pull log (below). They came back with a test map and asked for more logs on the test. I provided 4 logs and they just responded yesterday saying it looks better and gave me test map 2 which I will load and log this week. There is another thread with similar symptoms that prompted me to reach out to PTF. My guess is this is a known issue that is not a hardware issue but software driven. https://datazap.me/u/seanfitz335/log...1-3-4-6-8-9-21 |
Appreciate
1
lonewolf191110.50 |
02-28-2022, 11:32 AM | #7 | |
Major General
4374
Rep 7,622
Posts |
Quote:
Every log i have ever seen with a HPFP crash low enough to affect fueling the STFTs go positive. If the fuel trims went below 1 when your HPFP was already crashing the car would go extremely lean, which would not be good. |
|
Appreciate
0
|
02-28-2022, 11:34 AM | #8 | |
Major General
4374
Rep 7,622
Posts |
Quote:
|
|
Appreciate
1
lonewolf191110.50 |
03-01-2022, 02:22 AM | #9 |
Check out my Youtube @n55david!
1297
Rep 3,536
Posts
Drives: 2017 m240i, 2015 X3 x35i
Join Date: Aug 2018
Location: Michigan USA
|
Issue with it being the multimap. Some cars it freaks out on.. like mine
Can't wait to give them hell when the new stage 3 maps comes out
__________________
2017 m240i xDrive 10.67@132.32mph w/bm3
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
Appreciate
1
lonewolf191110.50 |
03-01-2022, 11:49 PM | #10 |
Enlisted Member
11
Rep 39
Posts |
I'll reach out to PTF so they have additional feedback and data on the issue, glad it's just related to the multimap. This exact issue may not be widespread but it's concerning as this map has been out for quite some time now.
I drove on this for several months without noticing anything was amiss, mainly just commuting with some pulls here are there. I didn't log after switching as I wasn't expecting any significant difference from the standard map. Lesson learned here, considering my AFR still remained close to target should I be concerned about any damage? I'm a bit confused seeing the HPFP dip and wondering how the ECU reacted to compensate. AFR readings resulting in the STFT value going very negative instead of positive, leading to the adjustment, rich conditions as a result? As stated it doesn't make sense, to pull fuel when the dip is present? Not super versed in this area but it makes me want to question the data being logged, specifically with the HPFP pressure, not sure. |
Appreciate
0
|
03-02-2022, 11:13 AM | #11 |
Private First Class
28
Rep 125
Posts |
Sounds similar to my issues as described in this post.
https://f30.bimmerpost.com/forums/sh....php?t=1861375 Reset your adaptations and try it with the MAF unplugged. That's how I "fixed" the issue. Not ideal but functional and the car performs well and the logs look acceptable. |
Appreciate
0
|
03-02-2022, 11:51 AM | #12 | |
Major General
4374
Rep 7,622
Posts |
Quote:
The DME will not pull fuel in response to HPFP crash. If the HPFP pressure dips low enough to reduce the fuel supply, AFR will go lean, and STFTs will increase (positive). In the datalog your HPFP angle is 109 during the crash, which supposedly means the pump "duty cycle" is maxed. |
|
Appreciate
1
lonewolf191110.50 |
03-02-2022, 11:53 AM | #13 | |
Major General
4374
Rep 7,622
Posts |
Quote:
|
|
Appreciate
0
|
03-02-2022, 08:40 PM | #14 |
Private First Class
28
Rep 125
Posts |
|
Appreciate
0
|
11-09-2022, 04:20 AM | #15 |
Second Lieutenant
137
Rep 250
Posts |
https://www.bootmod3.net/log?id=6363...90c66aae9556bf
kinda same issue running stage 1 acn91 new plugs, 0.028'' gapped, new coils hpfp dropped like a mofo |
Appreciate
0
|
11-09-2022, 11:00 AM | #16 | |
Major General
4374
Rep 7,622
Posts |
Quote:
|
|
Appreciate
1
ericlr1225136.50 |
11-09-2022, 12:10 PM | #17 | |
Second Lieutenant
137
Rep 250
Posts |
Quote:
no ethanol. Just did a short pull after seeing your reply. It's stock tune. mofo keeps crashing LOL it seems like going into a loop hole. a few directions I got by digging around: 1. plugs gapping. NGK fixed from 0.022'' to 0.028'' Didn't work (@F87source @ZM2) 2. EPKM fail. I don't have CEL, no engine shut off during driving, never stall, a little bit vibration during idle every couple seconds, rpm stays between 600-700rpm. afr moving between 14-15.3 back and forth. (Custom tuner wants me to buy a new EPKM) 3. HPFP. I don't think this would fail below stage 1&2 91acn power level. since my car's only 20k miles. Bought it in 2018, 4 years maintenance from dealer, all mods put on couple weeks ago. I ordered Dorch stg2 Since I'm going to do Ethanol later anyway. 4. LPFP. We(N55 M2) don't have LPFP sensor. I don't know how to diagnose it. But I don't have any trouble daily driving it for now. (from Custom tuner) 5. Bad Octane or Injector. Again, car is only 20k miles, full maintenance. Monitored with bimmerlink during driving. got 1 or 2 misfire count in different cynlinder but nothing major to throw a CEL from ECU. Sent one log to BM3 support after having a superknock during stage 2 acn91 two days ago. (Guessed by @Halim from PTF) Crashing all happened during WOT around 3k-7k rpm Other than that, just like you said, some of my logs looked totally fine. Last edited by ericlr1225; 11-09-2022 at 12:38 PM.. |
|
Appreciate
0
|
11-09-2022, 12:26 PM | #18 | |
Check out my Youtube @n55david!
1297
Rep 3,536
Posts
Drives: 2017 m240i, 2015 X3 x35i
Join Date: Aug 2018
Location: Michigan USA
|
Quote:
2. God your fuel is trash.. sorry 3. Stock tune? What specific mods are done?
__________________
2017 m240i xDrive 10.67@132.32mph w/bm3
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
|
Appreciate
0
|
11-09-2022, 12:39 PM | #19 | |
Major General
4374
Rep 7,622
Posts |
Quote:
The HPFP is mechanical so it really doesn't partially fail like that. I would expect LPFP or EPKM to be an all or nothing issue, not a low fuel flow issue. Your octane is bad but that wont affect fuel quantity. |
|
Appreciate
0
|
11-09-2022, 12:46 PM | #20 | |
Second Lieutenant
137
Rep 250
Posts |
Quote:
I usually don't buy cheap mods. |
|
Appreciate
0
|
11-09-2022, 12:48 PM | #21 | |
Second Lieutenant
137
Rep 250
Posts |
Quote:
|
|
Appreciate
0
|
11-09-2022, 01:12 PM | #22 | ||
Second Lieutenant
137
Rep 250
Posts |
Quote:
https://www.bootmod3.net/log?id=636b...0b439ed7c5f0d8 Just did one with LTFT on |
||
Appreciate
0
|
Post Reply |
Bookmarks |
|
|