Yes, they do and they are running it WRONG if it's a street car. Without the system being complete and AS DESIGNED, any diagnosis is ineffective. Lots of people drank the kool aid Jim Jones served, but they were WRONG too.
Fair point. I'll be honest I'm not even really sure what purpose that fulfills. I saw the diagram but what does that hose do that a breather and pcv doesn't? I know there's no significant vacuum at WOT so the PCV isn't as effective but wouldn't that be the same case at the air cleaner?
