Close

Page 1 of 2 12 LastLast
Results 1 to 25 of 26
  1. #1
    Join Date
    Jun 2010
    Location
    Europe
    Posts
    94
    Rep Points
    89.6
    Mentioned
    2 Post(s)
    Rep Power
    0


    Reputation: Yes | No

    FBO RB Turbo - strange missfire at high boost, help needed

    Hi guys,
    The car has new injector+new plug+new coil on cylinder 5.
    Still missfires on cyl. 5 and 6 (both of them at the same tine), at high rpm, on boost over 14,5 psi. Map 2 is max. map that can be used. Higher than Map 2 gives missfire.

    For all the people that experienced this and got it solved out, any help would be apreciated.

    P.S.:
    - new injector is coded and corectly installed, with new decoupling element and new gasket ring.
    - The old plug, with 10 000 miles on it, looks perfect.
    - Even tried with new NGK 5992, gaped at 0.022".
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  2. #2
    Join Date
    Mar 2010
    Location
    Toronto, Canada
    Posts
    6,676
    Rep Points
    3,291.4
    Mentioned
    225 Post(s)
    Rep Power
    0


    Reputation: Yes | No
    Either go with a single mass flywheel or go with cobb and turn off misfire detection

  3. #3
    Join Date
    Jun 2010
    Location
    Europe
    Posts
    94
    Rep Points
    89.6
    Mentioned
    2 Post(s)
    Rep Power
    0



    Reputation: Yes | No
    Thanks for your answer DZ.
    Isn't missfire detection dangerous for the engine?
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  4. #4
    Join Date
    Sep 2012
    Location
    Harrisburg
    Posts
    1,284
    Rep Points
    1,522.3
    Mentioned
    43 Post(s)
    Rep Power
    16


    Reputation: Yes | No
    I believe the misfire detection is such a big deal because excess unburnt hydrocarbons in the exhaust stream can literally melt catalytic converters. Emissions regulations get more and more strict all the time, so the DME is designed to do everything it can to prevent catalyst damage. Maybe this is why misfire detection is so sensitive. Turning it off would remove that level of protection for the cats, but unless you are completely oblivious, you are not going to drive a misfiring car around and melt your cats.

  5. #5
    Join Date
    Jun 2010
    Location
    Europe
    Posts
    94
    Rep Points
    89.6
    Mentioned
    2 Post(s)
    Rep Power
    0



    Reputation: Yes | No
    Ok, i understand the missfire detection stuff. It is an option I will consider.
    But, is there anyone that had such strange missfire and solved it somehow?

    Dzenno, you had such a missfire in the past. Did you manage to find out the real cause of it? Thanks.
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  6. #6
    Join Date
    Mar 2012
    Posts
    575
    Rep Points
    682.9
    Mentioned
    19 Post(s)
    Rep Power
    7


    Reputation: Yes | No
    It's the flywheel!

    Click here to enlarge Originally Posted by piele_bps Click here to enlarge
    Ok, i understand the missfire detection stuff. It is an option I will consider.
    But, is there anyone that had such strange missfire and solved it somehow?

    Dzenno, you had such a missfire in the past. Did you manage to find out the real cause of it? Thanks.
    Click here to enlarge
    MOTIV750 / MHD+JB4 / ADV / SB REAR O2

  7. #7
    Join Date
    Oct 2011
    Location
    NY
    Posts
    1,956
    Rep Points
    2,642.8
    Mentioned
    49 Post(s)
    Rep Power
    27


    Reputation: Yes | No
    D gave you the answer... a single mass flywheel will fix It with hardware.... software will fix it through turning off Misfire Detection
    09 6AT 335i Coupe M-Sport - SOLD
    Current - 16 Jeep Wrangler - Few Mods
    Looking for a n54 project e90/e82

  8. #8
    Join Date
    Mar 2010
    Location
    Toronto, Canada
    Posts
    6,676
    Rep Points
    3,291.4
    Mentioned
    225 Post(s)
    Rep Power
    0


    Reputation: Yes | No
    @piele_bps , see all of the above...all answers spot on!

    Turning it off isn't dangerous at all. Misfires can be felt even with detection off. All misfire detection does is make the car compliant to emissions standards and could save your catalytic converters I guess if you were to sit there misfiring for a very long time under WOT Click here to enlarge No one would do that so its very unlikely.

    By the way, its so bad that this VTT Stage 3 car has it turned off with its Dual Mass Flywheel Click here to enlarge It was also misfiring up top but in this case Tony wanted to go with just turning it off which is what I did on my car as well for the LONGEST time until very recently

  9. #9
    Join Date
    Dec 2012
    Location
    McHenry, IL
    Posts
    5,257
    Rep Points
    26.0
    Mentioned
    17 Post(s)
    Rep Power
    0


    Reputation: Yes | No
    Click here to enlarge
    PTF PROTuned | RB's | AMS FMIC | AR DP's | HPF Exhaust | CP-E DCI | Apex Arc 8's | 235/275 Star Specs |

    Click here to enlarge


  10. #10
    Join Date
    Mar 2012
    Location
    Ellicott City, MD
    Posts
    208
    Rep Points
    145.2
    Mentioned
    1 Post(s)
    Rep Power
    2


    Reputation: Yes | No
    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    @piele_bps , see all of the above...all answers spot on!

    Turning it off isn't dangerous at all. Misfires can be felt even with detection off. All misfire detection does is make the car compliant to emissions standards and could save your catalytic converters I guess if you were to sit there misfiring for a very long time under WOT Click here to enlarge No one would do that so its very unlikely.

    By the way, its so bad that this VTT Stage 3 car has it turned off with its Dual Mass Flywheel Click here to enlarge It was also misfiring up top but in this case Tony wanted to go with just turning it off which is what I did on my car as well for the LONGEST time until very recently

    Why the single mass flywheel makes the difference? Can you explain?
    Last edited by hkninja; 04-15-2013 at 01:37 PM.
    08 535i 6MT - JB4 G5 ISO - Luke performance flash - E40 & BMS 100% Meth - AR design catless DP - ETS 5" intercooler - BMS DCI - BMS OCC - ER chargepipe - HKS BOV - K-sport coilovers - UUC evo SSK - CDV deleted - ACS spoiler - Click here to enlarge

  11. #11
    Join Date
    Nov 2009
    Location
    Simi Valley, CA
    Posts
    7,981
    Rep Points
    8,872.9
    Mentioned
    627 Post(s)
    Rep Power
    89


    Reputation: Yes | No
    It could be a variety of things. Turning off misfire detection is risky IF the problem turns out to be a bad spray pattern or physical issue. But, the only other choice is to blindly replace the flywheel and hope it resolves it.
    Last edited by Terry@BMS; 04-15-2013 at 04:10 PM.
    Burger Motorsports
    Home of the Worlds fastest N20s, N54s, N55s, N63s, S55s, and S63s!

    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please see http://www.burgertuning.com/emissions_info.html for more information on legal requirements related to use of BMS parts.

  12. #12
    Join Date
    Jun 2010
    Location
    Europe
    Posts
    94
    Rep Points
    89.6
    Mentioned
    2 Post(s)
    Rep Power
    0



    Reputation: Yes | No
    I don't think it is a bad spray pattern.
    The plug looks fine, perfectly gray, and there is a new injector at cyl. 5 (that's what we did first, put a new injector).
    So this should be ok regarding spray pattern.
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  13. #13
    Join Date
    Jun 2010
    Location
    Europe
    Posts
    94
    Rep Points
    89.6
    Mentioned
    2 Post(s)
    Rep Power
    0



    Reputation: Yes | No
    The thing is that the car missfired even before with stock turbos! All this started once the cylinder head cover gasket started leaking. Should this be just a coincidence?

    The gasket is replaced, no more oil there, but $#@!ing missfire is still present.Click here to enlarge
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  14. #14
    Join Date
    Mar 2010
    Location
    Toronto, Canada
    Posts
    6,676
    Rep Points
    3,291.4
    Mentioned
    225 Post(s)
    Rep Power
    0


    Reputation: Yes | No
    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    It could be a variety of things. Turning off misfire detection is risky IF the problem turns out to be a bad spray pattern or physical issue. But, the only other choice is to blindly replace the flywheel and hope it resolves it.
    You'll know if its a bad injector and if you have an "actual" misfire problem the second you turn off misfire detection and run the car through high RPMs. It'll stumble still and not feel right.

  15. #15
    Join Date
    Mar 2012
    Location
    Ellicott City, MD
    Posts
    208
    Rep Points
    145.2
    Mentioned
    1 Post(s)
    Rep Power
    2


    Reputation: Yes | No
    Why would replacing a flywheel cure misfiring?
    08 535i 6MT - JB4 G5 ISO - Luke performance flash - E40 & BMS 100% Meth - AR design catless DP - ETS 5" intercooler - BMS DCI - BMS OCC - ER chargepipe - HKS BOV - K-sport coilovers - UUC evo SSK - CDV deleted - ACS spoiler - Click here to enlarge

  16. #16
    Join Date
    Mar 2012
    Location
    NOLA
    Posts
    32
    Rep Points
    43.2
    Mentioned
    0 Post(s)
    Rep Power
    0


    1 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by hkninja Click here to enlarge
    Why would replacing a flywheel cure misfiring?
    Causes flex in the crankshaft which causes the CPS go bat $#@!. At least that's what I recall. Search

  17. #17
    Join Date
    Jun 2010
    Location
    Europe
    Posts
    94
    Rep Points
    89.6
    Mentioned
    2 Post(s)
    Rep Power
    0



    Reputation: Yes | No
    Ok DZ, you win! Click here to enlarge
    I'll try missfire detection OFF. I have already borrowed a cobb AP.
    What is the difference between Missfire detection 1 and Missfire detection 2? Perhaps Bank 1 and 2? Click here to enlarge
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  18. #18
    Join Date
    Nov 2009
    Location
    Simi Valley, CA
    Posts
    7,981
    Rep Points
    8,872.9
    Mentioned
    627 Post(s)
    Rep Power
    89


    Reputation: Yes | No
    Sent you a flash file with misfire detection off. May the force be with you! Click here to enlarge
    Burger Motorsports
    Home of the Worlds fastest N20s, N54s, N55s, N63s, S55s, and S63s!

    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please see http://www.burgertuning.com/emissions_info.html for more information on legal requirements related to use of BMS parts.

  19. #19
    Join Date
    Jun 2010
    Location
    Europe
    Posts
    94
    Rep Points
    89.6
    Mentioned
    2 Post(s)
    Rep Power
    0



    Reputation: Yes | No
    Well, all ok with missfire detection OFF. Click here to enlarge
    Car is pulling strong up top, absolutly no esitation or stumble at "missfire rpm zone". And logs look perfect.

    All I have to do now is "kill" a tt-rs with hybrid turbo. Wish me luck, guys!
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  20. #20
    Join Date
    Jun 2010
    Location
    Europe
    Posts
    94
    Rep Points
    89.6
    Mentioned
    2 Post(s)
    Rep Power
    0



    Reputation: Yes | No
    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    Sent you a flash file with misfire detection off. May the force be with you! Click here to enlarge
    I'll send you the logs later Terry. Laptop battery is dead now.
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  21. #21
    Join Date
    Sep 2012
    Location
    Brisbane, Australia
    Posts
    3,263
    Rep Points
    1,417.7
    Mentioned
    53 Post(s)
    Rep Power
    15


    Reputation: Yes | No
    Click here to enlarge Originally Posted by ShrtBus Click here to enlarge
    Causes flex in the crankshaft which causes the CPS go bat $#@!. At least that's what I recall. Search
    I thought it was just the flywheel bottoming out the spring and the 'knock' noise it would make triggering the externally mounted sensor?

  22. #22
    Join Date
    Nov 2010
    Location
    Netherlands
    Posts
    6,194
    Rep Points
    6,728.7
    Mentioned
    73 Post(s)
    Rep Power
    68


    Reputation: Yes | No
    Maybe just a redundant question, but you did program your new injector values into the DME, right?
    There are two theories to arguing with women. Neither one works

  23. #23
    Join Date
    Jun 2010
    Location
    Europe
    Posts
    94
    Rep Points
    89.6
    Mentioned
    2 Post(s)
    Rep Power
    0



    Reputation: Yes | No
    Click here to enlarge Originally Posted by DavidV Click here to enlarge
    Maybe just a redundant question, but you did program your new injector values into the DME, right?
    Of course. it is written in the first post.
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  24. #24
    Join Date
    Nov 2010
    Location
    Netherlands
    Posts
    6,194
    Rep Points
    6,728.7
    Mentioned
    73 Post(s)
    Rep Power
    68


    1 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by piele_bps Click here to enlarge
    Of course. it is written in the first post.
    Ah, missed that line. Sorry.
    Just checking. Sometimes it's remarkable how the obvious can be overseen.
    There are two theories to arguing with women. Neither one works

  25. #25
    Join Date
    Jul 2012
    Posts
    217
    Rep Points
    305.2
    Mentioned
    7 Post(s)
    Rep Power
    4


    Reputation: Yes | No
    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    I thought it was just the flywheel bottoming out the spring and the 'knock' noise it would make triggering the externally mounted sensor?
    That's been kind of my theory, that hitting the end of travel is causing sudden changes in crank angle that mess with the sensor readings. But it's just speculation.

Page 1 of 2 12 LastLast

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •