[Spoolin335i]

Hey guys so I went ahead and replaced all 6 spark plugs with the NGK 97506 since I had to replace my coolant expansion tank. Thought, why not since I’m under the hood. Car was running fine prior to changing the spark plugs. Car is 2012 335i N55 motor with JB4 and MHD BEF. No other performance mods. I gapped the spark plugs to 0.22 with the burgermotorsport gap tool. Ever since replacing them I’ve been getting a rough idle with faults codes


2FA8
2EFE
2EFF
2EE0
2EE4

Please help. I checked all connectors and everything is connected. Car was perfectly fine prior to changing the plugs.

[Spoolin335i]

Uh.... I just solved it!!! So I swapped cylinder 1 ignition coil with cylinder 2 and the misfires just went away! I did noticed that when putting cylinder 1 ignition coil on ignition 2, it felt more secured...

[ky0u]

Originally Posted by Spoolin335i

Hey guys so I went ahead and replaced all 6 spark plugs with the NGK 97506 since I had to replace my coolant expansion tank. Thought, why not since I’m under the hood. Car was running fine prior to changing the spark plugs. Car is 2012 335i N55 motor with JB4 and MHD BEF. No other performance mods. I gapped the spark plugs to 0.22 with the burgermotorsport gap tool. Ever since replacing them I’ve been getting a rough idle with faults codes


2FA8
2EFE
2EFF
2EE0
2EE4

Please help. I checked all connectors and everything is connected. Car was perfectly fine prior to changing the plugs.

2EFE - Random/Multiple Cylinder Misfire Detected
2EE0 - Combustion misfiring, multiple cylinders: FI deactivation
2EE4 - Combustion misfiring, cyl 1: FI deactivation
2FA8 - Cyl 1 misfire, spark duration too short
2EFF - Cyl 1 misfire detected

Move the plug from cyl 1 to another cylinder, and the coil from cyl1 to a different other cylinder and see if the code follows one or the other


EDIT: just saw you solved it. Usually spark duration errors point to coils first. (keyword: usually)

[Spoolin335i]

Originally Posted by ky0u

2EFE - Random/Multiple Cylinder Misfire Detected
2EE0 - Combustion misfiring, multiple cylinders: FI deactivation
2EE4 - Combustion misfiring, cyl 1: FI deactivation
2FA8 - Cyl 1 misfire, spark duration too short
2EFF - Cyl 1 misfire detected

Move the plug from cyl 1 to another cylinder, and the coil from cyl1 to a different other cylinder and see if the code follows one or the other


EDIT: just saw you solved it. Usually spark duration errors point to coils first. (keyword: usually)

Ya I was about to take everything apart again but then I said hmm.... what the detailed description of the fault codes besides “misfire” and I figured it was all due to cylinder 1!