Originally Posted by saxon
carbon cleaning did not fix my issue
same symptoms only codes are cyl 5 misfire and 2ef7 just showed up
Themyst had a valve cover gasket issue, which probably had some PCV implications, causing a misfire. I think if I see a lot of liquid oil down in the port when I do this car's carbon clean, it will be a sign to pull the valve cover and check the gasket or replace the whole cover. Won't be the first time we've found a defective N54 cover. I also bought a digital manometer to check the PCV and crankcase pressure.
E92 335i/6MT Dinan Stage 3: intercooler, oil cooler, intake, flash, exhaust, LW dual-mass flywheel.
Vishnu PWM methanol custom trunk mount, Diffsonline 3-clutch Salisbury custom diff, Ohlins Road and Track coilovers, Vorshlag camber plates, much more...
E28 M5 w/ buncha stuff, R171 SLK350