Emission Control Systems: Description and Operation

EGR System Components - 5.4 Shown; 6.8 Similar:

CAUTION: Do not remove any part of the engine emission control system. Operating the engine without the engine emission control system will reduce fuel economy and engine ventilation. This will weaken engine performance and shorten engine life.

All engines are equipped with an Exhaust Gas Recirculation (EGR) system. The function of the EGR system is to reduce the emission of Nitrogen Oxide (NOx).

The EGR system consists of the following components:
- EGR valve
- vacuum control solenoid
- EGR tube
- emission control vacuum harness

PCV Valve - 6.8L Shown; 5.4L Similar:

All engines are 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
- PCV tube







The Vehicle Emission Control Information (VECI) decal shows the components of the emission control system with the correct vacuum hose routing. The VECI decal shows the color stripe of the vacuum hoses.