Car Tech: 1994 nissan sentra

1994 nissan sentra

car has 160,000 miles..it seems to run real well....however, how much air should be coming out of the oil filler cap when removed...sure sems like a lot...pcv valve appears to be ok....this is not my car and although i've worked on lots of vehicles....never on a nissan and never had this much air coming out of a oil fill port.....car does not smoke and appears to have good power....i'm looking at this car for someone......haven't run a computer scan yet.....check engine light was not on when i drove it a few days ago....was on when i started it this afternoon....then was off...what other known problems to look out for