If you PCV valve is missing, that would mean you have a vaccum leak at your intake, because there would just be a hole where you PCV line would connect to. This could cause excessive air to get into the intake and cause the fuel/air mixture to be so lean that it would not start.
The PCV valve is important in reducing corrosive gasses in your engine. Recommend you replace it soon.
Tuesday, April 6th, 2010 AT 12:30 PM