Mahhhtin

2009 C63 Weistec Stage 3
New plugs, coils, checked for vacuum leak, I've tried almost everything except swapping the ECU. Any suggestions would be very greatly appreciated. The car cruises fine, starts up fine, but the second I give it 3/4 throttle, CEL and wants to go into limp mode. I shut the car off and back on, no CEL and cruises fine

mr747

check o2 sensors

SikC63

Check the catch can setup and see if theres any oil in there. If you notice there isnt as much oil in there as before replace the PCV behind the motor. Also make sure that your air filters aren't clogged.

deadlyvt

you say new plugs, what gap did you set them to? Not sure what other stage 3 guys are using for gap but could be missing if there is too much gap

Mahhhtin

I've forwarded all this information over to my mechanic, thank you everyone for the advice. They logged it today and said it's running very lean on bank 1 at 4400 rpm. Will update after they get a tuner over there to see if it's a tune issue or something else

Mahhhtin

Here's a list of data from the log and what isn't wrong with the car