Chrysler laser 1990 Technical Information Manual page 124

INTAKE AIR CONTROL
w i
Throttle valve 0
before metenng
after metenng
Control by idle
idle air
Speed adjusting screw
Throttle valve
Coolant temperature ' C ( O F)
t c h -
Control of the volume of intake air is performed by the throttle
valve, the speed adjusting screw, the fast idle air valve and the
idle speed control servo, all of which are mounted on tti
throttle body.
DURING ENGINE WARM UP
The intake air flow during fast idle is controlled by both the wax
actuated air valve which functions. in response to the engine
valve
coolant temperature and the idle speed control servo that is
controlled by the engine control unit.
AFTER ENGINE HAS BEEN WARMED UP
Control of the intake air flow during curb idle (or the control of
curb idle speed) is performed by the idle speed control servo
which in turn is controlled by the engine control unit.
Refer to page 1445 for control of the idle speed control servo.
The idle speed can be adjusted. by increasing or decreasing the
intake air flow rate with the speed adjusting screw.
The off-idle intake air flow is controlled by the throttle valve;
operation of the accelerator pedal determines the degree that
the throttle valve is open at any particular moment.
, S p e e d a d j u s t i n g s c r e w
Fast idle air valve
oolant from thermostat case
To return pipe