PCV Valve
Remove PCV valve. Shake valve. Valve should rattle if moving freely. Apply air pressure to valve. Air should flow freely in one direction only. Connect PCV valve to vacuum hose and start engine. Ensure vacuum is flowing through valve.
Remove PCV valve. Shake valve. Valve should rattle if moving freely. Apply air pressure to valve. Air should flow freely in one direction only. Connect PCV valve to vacuum hose and start engine. Ensure vacuum is flowing through valve.