Porsche 928 1980 Owner's Manual page 75

Emission Control System
1 Fuel pump
2 Fuel filter
3 Fuel pressure damper
4 Fuel injector (8 x)
5 Fuel pressure regulator
6 Oxygen sensor
7 Control unit
8 Three way catalyst
9 Exhaust manifold
10 Ignition distributor
11 Intake manifold
12 Throttle valve housing
13 Cold start injector
14 Aux. air valve for cold start
15 Vacuum limiter
16 Venturi tube
17 El. air valve
18 Control valve
19 Thermo time switch
20 from fuel tank
21 to fuel tank
22 to charcoal canister
23 to brake booster system
74