E90Post
 


 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Cylinder 4 and 5 misfire



Reply
 
Thread Tools Search this Thread
      10-23-2024, 03:45 PM   #1
Aaronms29
New Member
5
Rep
22
Posts

Drives: 2008 bmw 335i e92
Join Date: Jun 2024
Location: northcarolina

iTrader: (0)

Cylinder 4 and 5 misfire

So I just put a new engine the car and some 17ts the only codes I’m getting is from a rough idle and rough under acceleration. The car has a brand new walboro 525 and the lpf and the hpf are reading fine attached are the short term fuel trims which look wrong to me I also will attach a log on spool street. I’m also getting timing corrections in basically all cylinders. https://*********************/graphs/l...2-27-05.41551/
Attached Images
  
Appreciate 0
      10-23-2024, 04:02 PM   #2
Sgop335
Colonel
Sgop335's Avatar
United_States
669
Rep
2,076
Posts

Drives: 07 335i e92, 08 535i
Join Date: Jun 2014
Location: MD

iTrader: (1)

one (or more) of the injectors in bank 2 could be leaking quite a bit...
__________________
335i e92 TPC 19Ts
Appreciate 0
      10-23-2024, 04:04 PM   #3
Aaronms29
New Member
5
Rep
22
Posts

Drives: 2008 bmw 335i e92
Join Date: Jun 2024
Location: northcarolina

iTrader: (0)

I was thinking that I was getting a light smoking after while.
Appreciate 0
      10-23-2024, 05:24 PM   #4
Aaronms29
New Member
5
Rep
22
Posts

Drives: 2008 bmw 335i e92
Join Date: Jun 2024
Location: northcarolina

iTrader: (0)

Replaced those two injectors with a couple I had still missing on 4 and 5
Appreciate 0
      10-23-2024, 07:12 PM   #5
Sgop335
Colonel
Sgop335's Avatar
United_States
669
Rep
2,076
Posts

Drives: 07 335i e92, 08 535i
Join Date: Jun 2014
Location: MD

iTrader: (1)

Replacing fi blindly is not the solution. First, the car sits for a while and the spark plugs for each cylinder on that bank are checked.
If the plug smells of gas / running black thats the giveaway. Only then the fi should be replaced w known good. Otherwise issue could be something else,
__________________
335i e92 TPC 19Ts
Appreciate 0
      10-23-2024, 07:14 PM   #6
Aaronms29
New Member
5
Rep
22
Posts

Drives: 2008 bmw 335i e92
Join Date: Jun 2024
Location: northcarolina

iTrader: (0)

I replaced them with known good injectors I’m getting a plug socket atm to swap plugs to see if the problem follows. When pulling the coil pack nothing changes. I’ve swapped the coil packs with known good aswell.
Appreciate 0
      10-24-2024, 06:47 AM   #7
Aaronms29
New Member
5
Rep
22
Posts

Drives: 2008 bmw 335i e92
Join Date: Jun 2024
Location: northcarolina

iTrader: (0)

At this point I’ve swapped the plugs, coils and the injectors (with new) the plugs and coils with known good ones from other cylinders. The issue still remains misfires on 4 and 5, at one point I unplugged 2 of the 02 sensors and it seemed to clear up a bit I would see on bank 2 afrs with them plugged in would be at 30 after unplugging them it would return to 15 as normal when plugged back in would jump up again. Any thoughts appreciated Sgop335
Appreciate 0
      10-24-2024, 06:48 AM   #8
Aaronms29
New Member
5
Rep
22
Posts

Drives: 2008 bmw 335i e92
Join Date: Jun 2024
Location: northcarolina

iTrader: (0)

gbalthrop hey man if you could take a look at this you’ve helped me in the past thanks!
Appreciate 0
      10-24-2024, 09:27 AM   #9
Sgop335
Colonel
Sgop335's Avatar
United_States
669
Rep
2,076
Posts

Drives: 07 335i e92, 08 535i
Join Date: Jun 2014
Location: MD

iTrader: (1)

re read and comprehend the post and comment on condition of All spark plugs in bank2
__________________
335i e92 TPC 19Ts
Appreciate 0
      10-24-2024, 09:29 AM   #10
Aaronms29
New Member
5
Rep
22
Posts

Drives: 2008 bmw 335i e92
Join Date: Jun 2024
Location: northcarolina

iTrader: (0)

They were black but not wet and did not smell of fuel.
Appreciate 0
      10-28-2024, 09:30 AM   #11
konstat
Private
konstat's Avatar
38
Rep
97
Posts

Drives: 2008 135i M Sport
Join Date: Oct 2024
Location: Massachusetts

iTrader: (0)

Quote:
Originally Posted by Aaronms29 View Post
They were black but not wet and did not smell of fuel.
What tune are you running and what fuel? The STFT you have pictured is very low, it’s possible your tune’s fuel scalar table is incorrect for your setup
Appreciate 0
      11-05-2024, 01:17 PM   #12
Aaronms29
New Member
5
Rep
22
Posts

Drives: 2008 bmw 335i e92
Join Date: Jun 2024
Location: northcarolina

iTrader: (0)

It was just leaky injectors
Appreciate 0
      11-05-2024, 03:37 PM   #13
konstat
Private
konstat's Avatar
38
Rep
97
Posts

Drives: 2008 135i M Sport
Join Date: Oct 2024
Location: Massachusetts

iTrader: (0)

Quote:
Originally Posted by Aaronms29 View Post
It was just leaky injectors
Surprising given your plugs weren’t wet. Thanks for the update
Appreciate 0
      11-05-2024, 05:22 PM   #14
Sgop335
Colonel
Sgop335's Avatar
United_States
669
Rep
2,076
Posts

Drives: 07 335i e92, 08 535i
Join Date: Jun 2014
Location: MD

iTrader: (1)

Quote:
Originally Posted by konstat View Post
Surprising given your plugs weren’t wet. Thanks for the update
See post 2
Wet if you give it a chance to sit overnight or so...
__________________
335i e92 TPC 19Ts
Appreciate 0
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 02:31 PM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST