WHen does a PCV valve go bad? How can you tell? on 2002 Mazda B2300

Years ago I broke off porcelain from the spark plug which fell into the engine. Uses oil ever since. Now it is running roughly, at 72000 miles.

Asked by for the 2002 Mazda B2300
1 answer
have a compression test done on that cylinder. have them do a wet and dry to see if there is ring damage. the damage may be surfacing now from that action.