Pontiac Fiero 1988 Service Manual page 713

6F-2 EXHAUST SYSTEM
.[3—.
m
1 - AIR MANAGEMENT SYSTEM
AIR I N L E T
2 - S E A L
3 - METAL MESH
4 - S H E L L
5 - OXIDATION
CATALYST
6— R E A R B E D
7— THREE-WAY
CATALYST
8— FRONT BED
520002-6F
1 - INSULATION
2 - OUTER WRAP
3 - CONVERTER SHELL
4 - CATALYST
5 - INSULATION
6 - BED SUPPORT
7~ FILL PLUG
8~ INLET GAS
9-
CATALYTIC PELLET
COMPOUND
10-
• OUTLET
GAS
Figure 2 Dual Bed Monolith
Figure 3 Single Bed Pellet Converter
1 - THREE-WAY CATALYST 6 - CONVERTER SHELL
2 - O U T L E T
7 -
1NSULAT10W
3 - O X I D A T I O N C A T A L Y S T 8 - FILL PLUG
4 ~ I N L E T 9 ~ INSULATION „ _
A | R m L E J
FILL PS UG
5 - RETAINER 1 0 - AIR PLENUM « A 8 R MANAGEMENT SYSTEM)
5 2 0 0 0 4 6 F
Figure 4 Dual Bed Pellet
2. Catalyst Types:
• Oxidation Catalyst
• Three-Way (Reduction) Catalyst
The oxidation catalyst is coated with a catalytic
material containing platinum and palladium which
lowersw levels of hydrocarbon (HC) and carbon mon-
oxide (CO), The catalytic coating on the three-way
(reduction) catalyst contains platinum and rhodium,
which lower levels of oxide of nitrogen (NO ) as well
as hydrocarbons (HC) and carbon monoxide(CO).