Positive Crankcase Ventilation (PCV)

Disconnect PCV valve from valve cover (intake manifold on Swift). Start engine and let idle. Check for vacuum at PCV valve. If vacuum is not present, disconnect PCV valve from hose. If engine runs rough or stalls, replace PCV valve. If engine does not run rough or stall, check for restriction in PCV hose. Repair as necessary. Shake valve and listen for rattle. Replace PCV valve if no rattle is heard.