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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > If it's not one thing it's another...



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      12-14-2014, 10:50 PM   #1
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Unhappy If it's not one thing it's another...

What's going on everybody? Well to make a long story short, I finally got my second set of VTT stage 2s installed today, after that first set had a mechanical defect. Anyways the install went pretty smoothly for the most part. After everything was put back together I started the car up. Once I started the car, it started misfiring on cylinders 1,2,and 3. I'm not sure how the hell that happened especially, since a turbo install has nothing to do with anything electrical. On a side note, my car was sitting in one spot for the last two months, so I'm not sure if that has anything to do with it or not. Lastly, I did install the RB PCV valve, BMS cowl filters and sport oil cooler valve so I'm quite sure that has nothing to do with anything. All I'm trying to do is drive home for the holidays, this upcoming week, but by the way this thing acts I'm actually scared to make the journey. Any suggestions?
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      12-14-2014, 10:54 PM   #2
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Have you tried swapping coils to see if the misfire follows? I would also recommend the one step colder plugs now since you are outputting more horsepower than you were prior to the turbo upgrade. Reset adaptations also, if you haven't already.
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      12-14-2014, 11:36 PM   #3
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Could be many things, but start with spark plugs and coils. When tuned spark plugs and coils don't last too much (when was the last time you did plugs or coils?). If car is still running like crap when cold, but good when warm, then next are the injectors.
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      12-14-2014, 11:43 PM   #4
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Could the O2 sensors being backwards cause a cylinder "disruption " or faux misfire? Or maybe one O2 connector plug not being completely seated. Maybe the battery is really low and discharged from sitting and needs a deep cycle charge.
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      12-15-2014, 11:20 AM   #5
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Sounds like the o2 sensors were installed backwards on the downpipe removal.

Gray sensors on the short pipe, black on the long
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      12-15-2014, 11:57 AM   #6
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Try swapping that VTT turbo out for a RB turbo, bet the misfires stop.
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      12-15-2014, 11:57 AM   #7
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Best way to never mix up your O2 wires is just remember the phrase "black is not back". Black for the front turbo, grey for the rear. My guess is also that you mixed them up.
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      12-15-2014, 02:55 PM   #8
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I'm with everyone else, sounds like O2 sensors.
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      12-15-2014, 02:56 PM   #9
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First thing that came to mind was battery since the car has been sitting for a while but definitely double check the o2's as that would cause a lot of problems.
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      12-15-2014, 10:29 PM   #10
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I just pulled all of the codes and this is what popped up:
29CD Misfiring, cylinder 1
29CF Misfiring, cylinder 3
29CE Misfiring, cylinder 2
29D9 Misfirings in case of tank filling level too low.
2C24 Lambda proben in front of catalytic converter, muddled
0000 Unknown Fault

So many codes...so many problems . I hope it is an easy o2 sensor swap and nothing else. This sh**s getting ridiculous.
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      12-15-2014, 10:45 PM   #11
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Quote:
Originally Posted by Shadow007 View Post
I just pulled all of the codes and this is what popped up:
29CD Misfiring, cylinder 1
29CF Misfiring, cylinder 3
29CE Misfiring, cylinder 2
29D9 Misfirings in case of tank filling level too low.
2C24 Lambda proben in front of catalytic converter, muddled
0000 Unknown Fault

So many codes...so many problems . I hope it is an easy o2 sensor swap and nothing else. This sh**s getting ridiculous.
O2 sensor.
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      12-15-2014, 10:51 PM   #12
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Quote:
Originally Posted by Infamy View Post
Try swapping that VTT turbo out for a RB turbo, bet the misfires stop.
LOWWW blow!!
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      12-16-2014, 12:06 AM   #13
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Quote:
Originally Posted by Tiago@VRSF View Post
Sounds like the o2 sensors were installed backwards on the downpipe removal.

Gray sensors on the short pipe, black on the long
This.

Same thing happened to me, its a easy enough mistake to make.
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      12-16-2014, 12:20 AM   #14
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Appreciate the hopefully I can switch them tomorrow.
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      12-16-2014, 11:53 AM   #15
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I also second the O2 sensors, had the same thing happen recently. Forgot to label them... they are labeled now
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      12-16-2014, 06:06 PM   #16
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I'M BACK IN MFIN BUSINESS!!! The o2 sensors were placed wrong so now I can finally hit the streets again!
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