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27aa Pre-Cat O2 sensor EML-Trouble Shooting Advice Needed
Hala to all fellas from m5board
I am new to the board, although I have read lots of threads, I have never actually posted in the forum before
Here is my story, I have 2007 m6 for 38k miles.
I have replaced everything, from rod-bearings, internal high-pressure vanos line, 4 solenoids, even pre cat O2 sensors, and MAFs for both banks for the error above. however, my car surges, and my butt keep saying the torque is not linear throughout the RPM.
Every cold start, I have emission light on with ISTA has a code for o2 sensor plausibility limit on bank 1.
I suspect the leak on intakes or exhaust, but there aren't any external leak observed.
No misfire or anything, but she still detects more air than she calculated from MAF sensor, only on bank 1.
Attached is the video clip I think is weird during my data logging last night.
actual position of idle actuator on bank 2 is almost a twice as that on bank 2.
Seems like idle actuator on bank 1 is adapted to a rich condition from its o2 sensor. what seems to me so far is its trying to open less flap for complementing the extra air coming in to equalize with bank 2, if you follow what I mean.
Please help me, I love my car, it is love and hate situation driving her around, want her stand straight again on her feet.