Emission System Vacuum Harness-5.4L Engine
WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The 5.4L engine is equipped with a positive crankcase ventilation (PCV) system. The function of the PCV system is to circulate blow-by gases from the engine crankcase to the engine intake.
The PCV system consists of:
- PCV valve
- ventilation hose
For further description and operation, refer to the INTRODUCTION article in ENGINE PERFORMANCE .