tpaxadpom

Hey guys I need some directions on how to troubleshoot the misfire on my wife's 550i. Periodically I get check engine light with 29CE and 29CC errors.
I have checked the spark plug on cylinder 2 and ingition coil. No issues were noted and no oil on the spark plug.

I have swapped spark plug and ignition coil on cylinder 1 and 2. Today my wife started the car and it had a really rough idle with 29CE and 29CC errors thrown. Since the problem didn't follow the spark plug/ignition coil I can conclude it is not ignition coil/spark plug related. What should be my next step? This issue is pretty rare and seems to happened only on cold start. I drove the car to work today and no problem with idling. I have BMW diagnostic software (inpa, rheingold...).
The car mileage is right under 40k miles.

Gee_115

Could be the fuel injector. Not sure exactly how you diagnose that without taking it out. Fuel injector shouldn't go bad at 40k though.

tpaxadpom

Thank you. I agree fuel injectors used on N62TU seemed to be pretty solid comparing to those used on N54 and other turbocharged motors. I wonder if CCV can cause this, the strange thing is that it is only cylinder 2 that is throwing the error and it happens very rarely.

cmyachtie

Welcome to my world.....have been chasing similar cold start misfires for 6 winters now with limited success here’s another thread with some suggestions, next thing I am going to try is replace my coolant temp. Sensor.

Help with cold start resulting in misfire on 545i - Bimmerfest - BMW Forums