Misfire at WOT (freeze frame data attached) - Bimmerfest - BMW Forums



Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > E90/E91/E92/E93 (2006 - 2013)

E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

Reply
 
Thread Tools Display Modes
  #1  
Old 11-10-2019, 07:38 PM
DRpeppZ DRpeppZ is offline
Registered User
 
Join Date: Sep 2019
Posts: 5
Mein Auto:
Misfire at WOT (freeze frame data attached)

Iíve recently purchased a 2007 335i 6MT and have a pretty serious misfire issue. At idle with AC off there is a miss that doesnít throw a check engine light but throws pending codes for cylinders 4,5,6. At WOT it usually will begin to misfire heavily at the top end of 2nd gear, I clutch in and shut the engine off, turn it back on and it no longer misfires. A few nights ago I pushed it hard through all the gears and the same thing happened as it usually does in 2nd but this time shutting the car off and turning it back on didnít remedy the misfire and it set codes instead of just flashing the CEL. Upon reading these codes I can see the pending for misfire at 4,5,6 and set codes for cylinders 5,6.

Iíve attached a freeze frame form when the codes were set, I also replaced the plugs and noticed there is oil in the spark plug wells. Leading me to believe the valve cover is leaking. FF data leads me to believe the valve cover is the cause, ruling out HPFP by the fuel rail pressure. I could be wrong though and thatís why Iím here. Thanks for any input.
Timing advance is 6 degrees and fuel rail pressure was 43,448 psi.






Sent from my iPhone using Tapatalk
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 11-11-2019, 07:34 AM
marvinstockman marvinstockman is offline
Officially Welcomed to the 'Fest
Location: Gaithersburg, MD
 
Join Date: Feb 2009
Posts: 140
Mein Auto: 1997 M#
Your fuel trim is all over the place, and I'm surprised the car even runs, with bank 1 & 2 LTFT running very lean. Pretty big vacuum leak?

Also, your fuel pressure should be between 50 and 60 psi, and not 43,000 psi. Maybe you're reporting the wrong units?

Get the data again, but during normal driving.
Reply With Quote
  #3  
Old 11-11-2019, 08:25 AM
relative4 relative4 is offline
Officially Welcomed to the 'Fest
Location: Denver, CO
 
Join Date: Sep 2017
Posts: 608
Mein Auto: '08 335xi E90 manual
Smoke test, walnut blast
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old 11-12-2019, 01:13 AM
DRpeppZ DRpeppZ is offline
Registered User
 
Join Date: Sep 2019
Posts: 5
Mein Auto:
Will provide data from normal driving tomorrow. Although while I was driving normally yesterday I noticed the fuel pressure at the rail was bouncing around from 650-900 psi. The STFT for both banks never got above or below 5% either.


Sent from my iPhone using Tapatalk
Reply With Quote
  #5  
Old 11-12-2019, 01:16 AM
DRpeppZ DRpeppZ is offline
Registered User
 
Join Date: Sep 2019
Posts: 5
Mein Auto:
Quote:
Originally Posted by DRpeppZ View Post
Will provide data from normal driving tomorrow. Although while I was driving normally yesterday I noticed the fuel pressure at the rail was bouncing around from 650-900 psi. The STFT for both banks never got above or below 5% either.


Sent from my iPhone using Tapatalk


Forgot to mention as well, that original fuel pressure reading was in mmhg, converted to psi is 831 psi. That is the fuel pressure at the rail as reported by my code reader.


Sent from my iPhone using Tapatalk
Reply With Quote
  #6  
Old 11-12-2019, 07:20 AM
marvinstockman marvinstockman is offline
Officially Welcomed to the 'Fest
Location: Gaithersburg, MD
 
Join Date: Feb 2009
Posts: 140
Mein Auto: 1997 M#
Dr. Pepp, sorry I forgot you have a high pressure fuel pump because you are direct injected, 50 to 60 psi is for manifold injection. As such, your pressures are probably normal, but I have no direct experience with direct injection.

That said, your LTFT is crazy.
Reply With Quote
  #7  
Old 11-12-2019, 07:23 AM
marvinstockman marvinstockman is offline
Officially Welcomed to the 'Fest
Location: Gaithersburg, MD
 
Join Date: Feb 2009
Posts: 140
Mein Auto: 1997 M#
Also, you need to monitor air/fuel ratio, which should be about 14.7.
Reply With Quote
  #8  
Old 11-12-2019, 08:21 AM
nsjames nsjames is offline
Officially Welcomed to the 'Fest
Location: US
 
Join Date: Nov 2017
Posts: 109
Mein Auto: e91
your long term fuel trims are super fat, but your short term is pulling almost all of that fuel.

I'd reset the fuel trims and see how it plays out, but you probably have some sort of leak somewhere. for it to have affected the long term trim that much it's been like that for a while.

do you know if it's ever had injectors replaced?
Reply With Quote
Reply

See More Related BMW Stories


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > E90/E91/E92/E93 (2006 - 2013)
Today's Posts Search
Thread Tools
Display Modes

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 On



Forum Jump


All times are GMT -7. The time now is 07:13 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
© 2001- VerticalScope Inc. All rights reserved.