PCV System: Maintenance: Notes

As engine may idle slow or rough due to clogged ventilator valve or system, never adjust carburetor idle without first checking valve and system. If ventilator valve or system become clogged, all crankcase ventilation will stop and could result in serious engine damage.

It is recommended the crankcase ventilation system be checked more frequently if vehicle is operated under severe conditions (extreme dust, prolonged idling, trailer hauling or short trips in cold weather).