Ive been doing tons of reading on the subject and now im just confused on what i should try first. Im limited on time so id like to try and get it right the first time. Heres a quick synopsis of whats going on:
2010 335i with JB4 (map 1) and 63k miles.
It all started when i was doing a hard pull and near the top of the gear, i had a misfire and then a short while later a SES light. The car still seemed to drive fine after that. A few days later im getting really bad cold start misfires for the first 5 mins or so in the morning. Codes come back as 2C3E, 2CAB, 29D2, 29D0, 29D1, 29CC. Misfires in Bank 2 and the Bank 2 pre cat o2 sensor. After the car is warm it runs fine all the way to redline and feels normal. Maybe a little rough on the idle but its never been perfect. My gas mileage is about 16-17mpg city.
The car sat in a body shop for a couple weeks repairing hail damage (thanks Boston), and I expected the SES light to be on when i got it back. It wasnt, and the car ran perfect for about 500 miles (possibly because they unplugged the battery). Then one day it was back and now its hit or miss with whether or not it will misfire on a cold start. It doesnt struggle to start and the misfires and rough idle usually take about 1 minute to appear so that makes me think its not the injectors. The fact that the whole bank 2 is misfiring makes me think its not the plugs (although i did not change them when i put the tune in about 2500 miles ago). So that leaves the o2 sensor...
I currently have two pre-cat o2 sensors in hand and can replace them tomrorow morning but before I dive into that fun little task can anyone validate my logic here or tell me im wrong?
Thanks in advance!
2010 335i with JB4 (map 1) and 63k miles.
It all started when i was doing a hard pull and near the top of the gear, i had a misfire and then a short while later a SES light. The car still seemed to drive fine after that. A few days later im getting really bad cold start misfires for the first 5 mins or so in the morning. Codes come back as 2C3E, 2CAB, 29D2, 29D0, 29D1, 29CC. Misfires in Bank 2 and the Bank 2 pre cat o2 sensor. After the car is warm it runs fine all the way to redline and feels normal. Maybe a little rough on the idle but its never been perfect. My gas mileage is about 16-17mpg city.
The car sat in a body shop for a couple weeks repairing hail damage (thanks Boston), and I expected the SES light to be on when i got it back. It wasnt, and the car ran perfect for about 500 miles (possibly because they unplugged the battery). Then one day it was back and now its hit or miss with whether or not it will misfire on a cold start. It doesnt struggle to start and the misfires and rough idle usually take about 1 minute to appear so that makes me think its not the injectors. The fact that the whole bank 2 is misfiring makes me think its not the plugs (although i did not change them when i put the tune in about 2500 miles ago). So that leaves the o2 sensor...
I currently have two pre-cat o2 sensors in hand and can replace them tomrorow morning but before I dive into that fun little task can anyone validate my logic here or tell me im wrong?
Thanks in advance!
MISFIRES: Help me decide what to change first
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