The PCV system only holds 1 valve, its under the intake manifold (and off course the "hockey puck"). I would advice to get the pcv valve replaced. Double check the hoses there as they are prone for splitting. I was chasing a boost leak and in the end it was one of the hoses under the intake manifold.
I already changed the PCV and the hoses but never checked the valves.
I have misfires on cylinders 1 and 2, mostly on cylinder 2.
When I clear the fault codes, the Lambda Control Bank 1 Sensor 1 (block 033) shows 25%, while block 032 (Adaptation Idle) is 0%, and (Partial) is also 0%. During this time, the misfire occurs.
After idling for a couple of minutes, the misfire stops, and block 033 fluctuates between -1.6% and 4.7%, while block 032 (Idle) remains constant at 5.3%, and (Partial) stays constant at 10.9%.
Questions:
Can "false air" (unmetered air) after the MAF cause all these issues?
Why do only cylinders 1 and 2 misfire during the first couple of minutes after clearing the codes?