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      04-07-2018, 02:51 PM   #1
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N54 Rough Running

Hello all!

I hope people are good at problem solving. The other day I was driving my car and the engine light came on. I used my Torque app and it is showing misfiring on 1, 2 and 3 and a bank 1 lean error. That lead me to replace the O2 sensor but it's made zero difference. The car won't drive over 10mph and if I try it comes up with a DSC failure warning.

I've tested the injectors with a trusty screwdriver and 1, 2 and 3 are not making any ticking noise. Seems like it could be the issue but why would 3 fail at the same time?

Anyone got any ideas?
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      04-07-2018, 03:28 PM   #2
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Have u tried shuffling the coils around? And maybe checking the gaps on the spark plugs?
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      04-07-2018, 03:33 PM   #3
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The coils on 1-3 are all new. 1 is 3 months or so and the other were fitted on Thursday when the problem started.
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      04-07-2018, 03:40 PM   #4
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Have a look here. The cheapest way to check is to shuffle the coils to double check the problem still persists with the same cylinders. If not, I would replace all spark plugs if they are fairly old. Failing that it could be injectors. But have a read at this.
www.e90post.com/forums/showthread.php?t=631829
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      04-07-2018, 04:21 PM   #5
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I'll give it all a check. Strange that all 3 injectors go at the same time, would lead me to believe it's something else.
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      04-07-2018, 04:44 PM   #6
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Yeah seems a bit iffy all 3 are failing... possible but u never know. Swap the 3 coils with the other 3 then check the codes. If it's still the same 3 cylinders then replace the plugs. If not give the 2 vanos solenoids a really good clean.... fairly easy to get out. If not look into injectors of fuel pumps. See if u can smell any fuel near the injectors incase it's the seals leaking.
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      04-10-2018, 06:26 AM   #7
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So I took the DME out and checked for failed MOSFETs and I found that the one for cylinder 3 is dead. Hopefully a cheap enough fix although I hear they can take an injector or coil with them.
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      04-10-2018, 07:45 AM   #8
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I've had the same issue with no codes. Still trying to find a solution as it comes and goes
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      04-10-2018, 11:27 AM   #9
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I've ordered new transistors and will be having them sorted this weekend. Fingers crossed!
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      04-15-2018, 02:05 PM   #10
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It worked! Had the transistors changed this weekend and I now have a car that runs. I'm still getting a "system too lean" issue though, so maybe the injector/s are bad too. They still tick, but maybe they're damaged and not delivering enough fuel.
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