2007 Dodge Ram 1500 Pickup Owner's Manual - Page 461

MAINTAINING YOUR VEHICLE 461 To minimize the possibility of catalyst damage: • Do not shut off the engine or interrupt the ignition when the transmission is in gear and the vehicle is in motion. • Do not try to start engine by pushing or towing the vehicle. • Do not idle the engine with any spark plug wires disconnected or removed, such as when diagnostic testing, or for prolonged periods during very rough idling or malfunctioning operating conditions. Emission-Related Components Positive Crankcase (PCV) Valve Proper operation of the crankcase ventilation system requires that the PCV valve be free of sticking or plugging from deposits. Deposits can accumulate in the PCV valve and passages with increasing mileage. Have the PCV valve, hoses, and passages checked for proper operation at the intervals specified. If the valve is plugged or sticking, replace with a new valve- do not attempt to clean the old PCV valve! Check the ventilation hoses for indications of damage, weepage or plugging with deposits. Replace if necessary. Maintenance Free Battery The top of the maintenance free battery is permanently sealed. You will never have to add water, nor is periodic maintenance required. 7