My 1992 4/4 has a CVH Efi engine. On this engine the crankcase ventilation feeds back into the air intake pipe from the wheel arch into the filter box. So oily vapour is introduced into the incoming air as a normal thing. I have fitted a K&N as i don't think it will compromise or worsen what is already considered "normal"
I have not checked my MAF sensor yet though....
Seems a good idea when I sorn the car at end Nov for some cold weather refurb/cleaning/servicing.(Tax runs out then so taking the chance to do some work)
I have not noticed any issues with running to date but a clean up may show me a difference. I have had the car about 18 months and done about 7k miles. car has certainly loosened up in that time as previous owners had done very low mileages over preceding years - still only 30k on clock.
