Fuel cut during WOT using MBC
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This is a discussion on Fuel cut during WOT using MBC within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; So recently my stock bcs stopped working and I replaced it with a hallman type mbc. I have a tuner ...

  1. #1
    Registered User Random2006's Avatar
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    Fuel cut during WOT using MBC

    So recently my stock bcs stopped working and I replaced it with a hallman type mbc. I have a tuner that's been etunning my car and has been great to work with me. So I installed the mbc and slowly started to adjust the boost level to creep up to the target level which was around 17psi. After passing 13-14 psi I start to get fuel cut and the car lunges. The only time I've ever had the same issue is when I was overboosting due to a vac leak some time ago. Tried a new tune setup and still having issues. Wondering if I should continue working with the tuner or if I should be looking at hardware that could be the cause. I've read that the stock bpv sometimes has this issue but I switched mine out with a friends STi a while back when he was trading up so that shouldn't be the issue. No apparent air leaks and the only mod is k&n typhoon intake. Just hoping for some feedback before I continue to bug my tuner.
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

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    Master Baiter EJ257's Avatar
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    What does your tuner say?
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    Registered User Random2006's Avatar
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    He hasn't replied yet, I was just wondering if I should be looking for something on my end.
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

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    Subaru Newb MainFrame's Avatar
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    It's hard to say with no data to go on. Some logs, or even a copy of your map should shed some light on what's happening.

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    Registered User Random2006's Avatar
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    Computer wouldn't allow me to upload cvs files so I'll have to convert the file before I can share it. My tuner says it may be the fuel pump
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

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    Subaru Newb MainFrame's Avatar
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    Do you have a wideband O2 sensor installed?

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    Registered User Random2006's Avatar
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    Just going off of romraider logger. Haven't had the money to spend on gauges.
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

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    Registered User Random2006's Avatar
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    So I'm going to replace the fuel filter and possibly the lines that connect to it. I'm getting a strong gas smell around that area. There is also another filter like device that is on the line next to the fuel filter. Anyone know what this is?
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

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    Subaru Newb MainFrame's Avatar
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    Quote Originally Posted by Random2006 View Post
    So I'm going to replace the fuel filter and possibly the lines that connect to it. I'm getting a strong gas smell around that area. There is also another filter like device that is on the line next to the fuel filter. Anyone know what this is?

    Pressure regulator?

  11. #10
    Registered User Random2006's Avatar
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    I took it off to see if it had blockage and it was hollow. Some kind of dampener I suppose. There also wasn't any pressure I that line.
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

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    Master Baiter EJ257's Avatar
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  13. #12
    Registered User Random2006's Avatar
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    Yes he said my issue is fuel related.
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

  14. #13
    Registered User Random2006's Avatar
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    The issue ended up being the Bosch spark plugs I had. Replaced with NGK and bam full boost.

    Sent from my SCH-I535 using Tapatalk
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

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