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

              
   
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    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".
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    Either go with a single mass flywheel or go with cobb and turn off misfire detection
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    Thanks for your answer DZ.
    Isn't missfire detection dangerous for the engine?
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    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.

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    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.
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    It's the flywheel!

    Click here to enlarge Originally Posted by piele_bps Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    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

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    D gave you the answer... a single mass flywheel will fix It with hardware.... software will fix it through turning off Misfire Detection
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    @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
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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    @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.
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    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.
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    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.
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    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
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    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.
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    Why would replacing a flywheel cure misfiring?
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    Click here to enlarge Originally Posted by hkninja Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    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

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    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
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    Sent you a flash file with misfire detection off. May the force be with you! Click here to enlarge
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    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!
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    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.
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    Click here to enlarge Originally Posted by ShrtBus Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    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?

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    Maybe just a redundant question, but you did program your new injector values into the DME, right?
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    Click here to enlarge Originally Posted by DavidV Click here to enlarge
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    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.
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    Click here to enlarge Originally Posted by piele_bps Click here to enlarge
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    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.
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    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
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    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.

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