Buick LeSabre 1965 Service Manual page 101

ENGINE FUEL AND EXHAUST ADJUSTMENTS 3 - 2 5
7. If carburetor is equipped with
a hot idle compensating valve,
press a finger on valve to make
sure it was closed. If idle speed
drops, valve was open; readjust
idle speed and mixture, making
sure valve remains closed.
b. Automatic Choke
Adjustments
The choke thermostat is cali-
brated to give satisfactory per-
formance with regular blends of
fuel when it is ^aced at the
standard factory setting, which is
listed in the specifications for
each carburetor.
When it is necessary to adjust the
thermostat, loosen the housing or
cover attaching screws and turn
as required.
Thermostat settings other than
standard should be used only when
the car is habitually operated on
special blends of fuel which do
not give satisfactory warm-up
performance with the standard
setting. A "Lean" setting may be
required with highly volatile fuel
which produces excessive loading
or rolling of engine on warm-up
with the standard thermostat set-
ting. A "Rich" setting should be
used only when excessive spitting
occurs on engine warm-up with
the standard thermostat setting.
When making either a "Lean" or
"Rich" setting, change one point
at a time and test results with en-
gine cold, until the desired per-
formance is obtained.
If the engine operates on fast idle
too long after starting or else
moves to slow idle too soon, or
the choke unloader does not oper-
ate properly, check the fast idle
and choke unloader adjustments.
3 - 9 THROTTLE LINKAGE
AND TRANSMISSION
SWITCH ADJUSTMENTS
The p r o c e d u r e for adjusting
throttle linkage is identical on
s y n c h r o m e s h and automatic
transmission c a r s . Automatic
transmission cars, however, have
a dash pot which d e l a y s the
closing action of the throttle to
reduce any possibility of the en-
gine stalling.
THROTTLE
ROD
NORMAL SPRING
HOOK-UP
SERIES 45-46-48 \
FRONT
OF DASH
IDLE STATOR
SWITCH
THROTTLE
RETURN
SPRING
TRANSMISSION
STATOR AND
DETENT SWITCH
NORMAL
HOOK-UP
SERIES 49
Figure 3-20—Throttle Linkage Adjustment