2005 Jeep Wrangler Owner's Manual - Page 260
2005 Jeep Wrangler Manual
Page 260 highlights
260 MAINTAINING YOUR VEHICLE Engine Timing Belt - 2.4L Engine Replace the engine timing belt at the intervals described in the appropriate maintenance schedule. Ignition Wiring System - 2.4L Engine Replace the ignition cables at the intervals described in the appropriate maintenance schedule. Crankcase Emission Control System Proper operation of this system depends on freedom from sticking or plugging due to deposits. As vehicle mileage builds up, the PCV valve and passages may accumulate deposits. If a valve is not working properly, replace it with a new valve. DO NOT ATTEMPT TO CLEAN THE OLD PCV VALVE! Check ventilation hose for indication of damage or plugging deposits. Replace if necessary. Fuel Filter A plugged fuel filter can cause hard starting or limit the speed at which a vehicle can be driven. Should an excessive amount of dirt accumulate in the fuel tank, frequent replacement of the fuel filter which is mounted in the fuel tank may be necessary. Engine Air Cleaner Filter Under normal driving conditions, replace the air filter at the intervals shown on "Maintenance Schedule A." If, however, you drive the vehicle frequently under dusty or severe conditions, the filter element should be inspected periodically and replaced if necessary at the intervals shown on "Maintenance Schedule B."