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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 > Remove JB4 before service at dealership???

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      06-25-2011, 03:04 PM   #1
Drives: 2008 335i jb4 bms DCI, cpe DP
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Remove JB4 before service at dealership???

I recently installed a jb4 and dual cone intake into my 08 335i and have been getting the code 29cd which mean i have a misfire in cylinder 1. Should i replace my spark plug and or coil in cylinder 1 or should i take it into the dealer and let them figure it out and change whatever needs to be changed? Also do i need to remove my jb4 tune before taking the car in for service? or can i leave it in and set it to map 0. The car has 47k miles and is still under warranty. ANY IDEAS???
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      06-25-2011, 03:08 PM   #2
Keik E92 M3
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2011 BMW 335i  [3.40]
Just remove it to be safe. Always....
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      06-26-2011, 02:34 AM   #3
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I always leave in my Injen DCI, RSD Charge Pipe, and other mods, but I always remove my JB4 before taking it in for service. Better to be safe than sorry. Every dealership and SA is different. My dealership told me they don't mind mods but they will mind if they find a tune.
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      06-26-2011, 02:39 AM   #4
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I would remove it, this is a no brainer
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      06-26-2011, 02:48 AM   #5
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Just do it. I need to take mine in to look at a transmission leak, and they will probably never lift the hood, but I still took my JB4 out. Took me all of 45 minutes and that was going at a slow, cautious pace.
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jb4, misfire, warranty

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