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B. Decel Dashpot (Automatic
Transmission Only)
The decel
dash pot acts upon the throttle
linkage to minimize
incomplete comb ustion
during
engine
deceleration.
C. Decel Fuel Shutoff (Manual
Transmission Only)
A solenoid
operated
air
by-pass valve reduces
air flow
in
the air flow
sensor, lowering the fue
l
distributor plunger interrupting
fuel flow during
dec
eleration.
The
solenoid
is controlled by an
engine speed relay
and a throttle contact
switch. During deceleration
at engine speeds
above
1575
RPM the solenoid
opens the by-pass
valve. When the speed
drops below
1375
RPM
the system de-activates
allowing normal
opera·
tion
.
D. Lambda Control System
Lambda Control
System is a closed loop feed-
back system adapted to the C.1. System
to
con-
stantly maintain close airlfuel rat io c ontrol
under all operating conditions. At an airlfuel
ratio of
14.5
to one (Lambda
=
1
at this ratio), all
three regulated pollutants (hydrocarbons, car-
bon monoxides, oxides of nitrogen) may be si-
multaneously controlled efficiently by a special
threeway catalyst. An oxygen sensor in the ex-
haust manifold monitors the oxygen content of
the exhaust and sends a proportional signal to
an electronic control unit (under the rear
seat.)
This signal is compared to a predetermined
value and an output signal is sent to a fuel pres-
sure modulating valve to make the necessary
fine adjustment of the airlfuel ratio
.
Until the
sensor warms up after the engine
is
started, the
modulating valve will operate at a constant
pre-
determined value. This is also true in the case of
wide open throttle operation or speeds above
3800 RPM (Turbo only) and in the event of sensor
failure (the car will not be disabled)
A maintenance rem inder
lamp,
labeled
"
EXH
"
,
on the Instrument pane
l
i
lluminates every
30,000 miles to indicate that the oxygen sensor
is scheduled for replacement (After this service
is performed your dealer w ill reset the lamp ac
tuating mechan ism
.)
3
1. Electronic Control Un it
2 W ide Open Throttle Switch (Turbo only)
3. Oxygen Sensor
E.
Three·Way Catalyst
The catalytic converter contains a special
platinum and rhodium coated dual segment
substrate which simultaneously frees oxygen
from oxides of nitrogen and oxidizes (burns)
hydrocarbons and carbon
monoxide.
Unleaded
fuel
1
5 required to protect the conversion effi-
ciency of the catalyst.
4
4
Catalytic Converter
5.
Modulating Valve.
5
27
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