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09-01-2018, 05:50 PM | #1 |
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n54 misfire only when on JB4 map
Hello,
09 135IS FBO I just replaced my plugs and started getting random misfires. Sometimes its 1&6 and other times its all cylinders. The misfire goes away and the car becomes smooth again after a restart or a code clearing. The misfires happen during WOT pulls. Say I'm cruising 40mph and floor it then I start getting misfires. This only occurs when I'm on a JB4 map. If i set JB4 to 0 then I get no misfires at all. New NGK Iridium OneStep colder plugs (this didn't happen with the older OEM plugs) Do you guys have any idea what's causing it? |
09-02-2018, 07:57 PM | #2 |
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Drives: 2008 BMW 135i (E88 N54 6AT)
Join Date: Aug 2016
Location: Sunshine Coast QLD Australia
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The JB4 maps push your car harder than stock, so its likely a result of that rather than the JB4 directly.
Have you replaced the coil packs? |
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09-02-2018, 11:16 PM | #3 |
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09-13-2018, 10:01 AM | #5 |
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09-21-2018, 03:18 PM | #6 | |
More Boost?
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Quote:
Yeah i agree... who knows what FBO means should mean aftermarket turbos with big boost. I dont believe you need to change them with the stockers |
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