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Junior Member
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Posts: 57
Join Date: Jul 2019
Car: N54 335i
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Someone please help me, N54 misfire -
05-25-2020, 02:55 AM
What’s up everyone, I’m hoping someone can help me with these logs I have attached here to figure out what’s up with my car. When I hit boost it starts to misfire... I put 2 gallons of E85 in today and also just upgraded my FMIC to a 7.5 and my car started to act weird. I tried to figure it out with a friend of mine also but we couldn’t really see what’s wrong because we don’t know what’s acceptable and what’s not. Thank you for the help guys really appreciate it!
Also I only misfire under high boost.
Also on JB4 it’s cutting boost Bc of AFR’s to lean.
Last edited by Ifreezebmx562; 05-29-2020 at 02:40 AM..
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Junior Member
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Posts: 54
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Car: 2007 335i
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05-26-2020, 03:13 AM
Logs should be WOT 2k rpm to redline, 3rd gear, traction completely off.
2007 e90 335 - BMS DCI - JB4 - feline less - AFE scoops -VRSF CP - HKS BOV - VTT PCV - BMS Cowl Filters - Muffler Delete - PUMP BEF - e30
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Junior Member
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Posts: 57
Join Date: Jul 2019
Car: N54 335i
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05-26-2020, 03:23 AM
Quote:
Originally Posted by Geo335
Logs should be WOT 2k rpm to redline, 3rd gear, traction completely off.
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This is the closest thing I got. |
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Legend
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Posts: 1,455
Join Date: Apr 2016
Car: 2008 E93
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05-26-2020, 02:58 PM
Quote:
Originally Posted by Ifreezebmx562
This is the closest thing I got.
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What cyl misfires ? Bank 1 ?
What plugs are you running ?
What coils ?
How old ? |
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Junior Member
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Posts: 57
Join Date: Jul 2019
Car: N54 335i
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05-26-2020, 05:44 PM
Quote:
Originally Posted by THE BEAST
What cyl misfires ? Bank 1 ?
What plugs are you running ?
What coils ?
How old ?
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I currently swapped back to my Bosh plugs. From FCP Euro
The coils are Delphi
And they are both under a year old.
The coils have been used constantly but the plugs were used for about 6 months.
I’m getting a AFR drop only under boost. It’s dropping down to 10.7 on a log I saw today which is means JB4 is just cutting everything. But it doesn’t make sense why it only cuts cylinder 3.
I also have brand new index 12’s that I’ve been running a week before the problem. |
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Legend
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Posts: 1,455
Join Date: Apr 2016
Car: 2008 E93
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05-26-2020, 05:58 PM
Quote:
Originally Posted by Ifreezebmx562
I currently swapped back to my Bosh plugs. From FCP Euro
The coils are Delphi
And they are both under a year old.
The coils have been used constantly but the plugs were used for about 6 months.
I’m getting a AFR drop only under boost. It’s dropping down to 10.7 on a log I saw today which is means JB4 is just cutting everything. But it doesn’t make sense why it only cuts cylinder 3.
I also have brand new index 12’s that I’ve been running a week before the problem.
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Jb4 shouldnt cut anything at those AFRs.
Where did you get the index 12s from ?
Im going to guess (since no good logs), that would be your issue. |
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Legend
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Posts: 1,238
Join Date: May 2014
Car: 335i E92 2009
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05-26-2020, 06:33 PM
Quote:
Originally Posted by Ifreezebmx562
I currently swapped back to my Bosh plugs. From FCP Euro
The coils are Delphi
And they are both under a year old.
The coils have been used constantly but the plugs were used for about 6 months.
I’m getting a AFR drop only under boost. It’s dropping down to 10.7 on a log I saw today which is means JB4 is just cutting everything. But it doesn’t make sense why it only cuts cylinder 3.
I also have brand new index 12’s that I’ve been running a week before the problem.
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Just to confirm that you coded the new injectors?
09 E92 335i - Hot-Climate Middle East package, M Sports suspension, 19" Rims, 6AT fully built internals, bushings, raybestos clutches and sonnax with xHP stage 3, Differential lockdown, New RB Turbo CHRA, JB4 - Map 3 70 adder with N20 TMAP - MHD BMS Race Flash with Tuned Duty Bais and PID - BMS Oil Cooler Valve - RB PCV - K&N DCI - AFE Air Scoops - 98 Super Fuel - WAGNER FMIC - 3" down's, RB Inlets- BMS charge pipe With Tial BOV - BMS Meth Kit with FSB, 30/70 Water/Meth on CM12 nozzle
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Junior Member
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Car: N54 335i
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05-26-2020, 08:09 PM
Quote:
Originally Posted by Rushan
Just to confirm that you coded the new injectors?
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Yes! I coded with protool. |
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Legend
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Car: 2008 E93
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05-26-2020, 08:14 PM
Purchased from ?? (Injectors)
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Junior Member
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Car: N54 335i
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05-26-2020, 08:16 PM
Quote:
Originally Posted by THE BEAST
Purchased from ?? (Injectors)
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Fcp euro |
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Legend
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Posts: 1,455
Join Date: Apr 2016
Car: 2008 E93
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05-26-2020, 08:19 PM
Quote:
Originally Posted by Ifreezebmx562
Fcp euro
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Pull the one that misfires and see if it smells of gas
Or swap it with another bank and see if it follows.
Last edited by THE BEAST; 05-26-2020 at 08:28 PM..
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Junior Member
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Posts: 57
Join Date: Jul 2019
Car: N54 335i
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05-26-2020, 08:45 PM
Quote:
Originally Posted by THE BEAST
Pull the one that misfires and see if it smells of gas
Or swap it with another bank and see if it follows.
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Did you have the same problem? |
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Legend
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Posts: 1,455
Join Date: Apr 2016
Car: 2008 E93
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05-26-2020, 08:48 PM
Quote:
Originally Posted by Ifreezebmx562
Did you have the same problem?
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No, but running rich and misfiring leads me to believe injector |
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Junior Member
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Posts: 190
Join Date: Nov 2011
Car: 2007 335i
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05-26-2020, 11:16 PM
Cams position sensor could be bad as well
JB4 flash with JB4, 4.0 bar sensor, DocR 6870, Race InterC, FuelIT stage 3 (525), Helix OverDrv 3x, Phoenix Intake with PI (750cc) with BMS controller, PrRW coil pack kit, WaveTrc Diff. E85
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Junior Member
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Posts: 57
Join Date: Jul 2019
Car: N54 335i
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05-29-2020, 02:41 AM
Quote:
Originally Posted by THE BEAST
No, but running rich and misfiring leads me to believe injector
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swapped injector from cylinder 3 to 2
same problem. |
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Junior Member
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Posts: 57
Join Date: Jul 2019
Car: N54 335i
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05-29-2020, 02:41 AM
Quote:
Originally Posted by albertc
Cams position sensor could be bad as well
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thats one thing i have not changed... but would that cause a single cylinder misfire constantly? |
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Junior Member
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Posts: 57
Join Date: Jul 2019
Car: N54 335i
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05-29-2020, 02:43 AM
Ive attached a new log from today.
today i put a MHD BEF on my car in hopes it could be something with JB4 not having a BEF and nothing.
same thing happened with AFR Lean cuts.
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