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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 > 08 135i: Persistent Cylinder 5 Misfire??



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      01-10-2017, 11:10 AM   #1
rocksarntpeople
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08 135i: Persistent Cylinder 5 Misfire??

Title says it all...persistent misfire code on cylinder 5 and just trying to figure out why...below is the list of the things I have replaced in the order they were done and mileage...stock tune and car currently has 61,500 miles:

Plugs: OEM - 59500
Coils: OEM Eldor - 59500
Walnut Blasting: 59800
Replace all Oil Gaskets (oil filter housing, valve cover, oil pan, front and rear main) Coolant, Oil and Filter: 60000
Full OEM Turbo Replacement all lines, etc: 60500
PCV and Catch Can: 60500
VRSF Charge Pipe and Tial BOV: 60500
6 OEM Index 12 Injectors/Decouplers: 61000
Both Precat O2 sensors: 61500
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      01-10-2017, 11:33 AM   #2
NoQuarter
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I put in a brand new coil, still got a misfire.

Replaced the new coil with another new coil - misfire gone.
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      01-10-2017, 11:36 AM   #3
rocksarntpeople
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Quote:
Originally Posted by NoQuarter View Post
I put in a brand new coil, still got a misfire.

Replaced the new coil with another new coil - misfire gone.

Good to know...gonna try and move the plug and coil from cylinder 5 around and see if it follows.
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      01-10-2017, 01:45 PM   #4
mxchris727
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If the misfire remains, than you might have a bad MOSFET in the DME for that one cylinder. Other than that, it would have to be mechanical.
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      01-11-2017, 12:10 PM   #5
swedishpowah
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What is the exact code that you're getting?
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      01-11-2017, 12:30 PM   #6
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So an update....I moved the plug from cylinder 5 to cylinder 1 and the coil from cylinder 5 to cylinder 2...cleared the misfire code and everything seems ok minus a bit of stumbling at idle but no codes even under WOT...when I floor it in lower gears there is a slight hesitation so I filled up with 93 Sunoco and ran some Techron through it to see if it clears up...next step might be clean both MAP and TMAP sensors??


***Both Plugs and Coils looked normal...slight gas smell, but nothing out of the ordinary...not wet or black***
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      01-11-2017, 12:30 PM   #7
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Another thought: What is the proper way to reset all the adaptations and learned values? INPA? ISTA? Flash a tune on it? Perhaps there are still some out of whack due to the various parts that were replaced?
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