Saab 900 1983 - II. The Evaporative Emission Control System; III. The Exhaust Emission Control System

II. EVAPORATIVE EMISSION
CONTROL SYSTEM
A sealed fuel system is used to prevent the
emission into the atmosphere of vapors from
the stored galloline supply. Evaporated fuel is
vented
from the fuel system to the charcoal
canister whtch is connected to the throttle
housing. The evaporated fuel is purged from the
charcoal canister and burned by the engine
when
It Is running. Except on vehicles produced
with a fuel pump enclosure and feeder pump,
the fuel
tank is pressurized to about 1.5 psi by a
valve
In the ventilation line.
1. Fuel Tank
2. Fuel Tank Vent
Lines
3. Ventilation Line to Charcoal
Canister
4. Inlet Air
5. Charcoal Canister
6. Fuel Distributor
26
7. Air Cleaner
8.
Inlet Air and Gas
Vapors
9.
Inlet Manifold
10 . Check Valve
11 . Pressure Valve
12 . Rollover Valve
12
III. EXHAUST EMISSION
CONTROL SYSTEMS
A. Continuous Injection System
The C.1. System allows precise fuel metering
which results in lo w baseline emi ssions while
retaining good driveability, performance and
economy. The
intake air flow volume deter·
mines the correct momentary quantity of fuel
metered
to the four intake port i njectors for
most efficient combusion The engine draws In
more or less air depending on its speed and the
load applied.
1. Fuel Tank
2. Fuel Pump
3. Fuel Ac
cumulator
4 Fuel Fi lter
5. Fuel Di stributor
6. Warm Up
Regulator
7. Air
Flow Sensor
Plate
8.
Cold Start Valve
9.
Injection Valve
10. Thermo·Tlme
SWitch
11 . Auxiliary Air Va l ve
12 . Wide Open
Throttle Switch
(Turbo only)
13. Pressure Relief
Valve
14. Air Cleaner
15 . Modulating Valve
16 . Electronic Contro l
Unit
17 . Oxygen Sensor
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