Emission System Application Chart

Engine 7.4L (454 cid)

Fuel System Throttle Body Injection (TBI)

DEVICES & SYSTEMS

CAT Three Way Catalyst
MIL Maintenance Indicator Lamp ("Service Engine Soon" lamp)
EGR Exhaust Gas Recirculation
EVAP Evaporative Emission Control
FR Fuel Pipe Restrictor
HO2S Oxygen Sensor
PCM Powertrain Control Module
PCV Positive Crankcase Ventilation
SPK [1] DI, IC, KS

[1] DI - Distributor Ignition.
IC - Ignition Control. (Formerly called Electronic Spark Timing or EST).
KS - Knock Sensor. (Formerly called Electronic Spark Control).