Chevrolet Corvette 1963 Repair & Tune-Up Manual page 188

170 EMISSION CONTROLS AND FUEL SYSTEM
check to see that the unit is operating on the
economy stop. Some injectors may be diffi-
cult to start with the cranking-signal valve line
disconnected. The line may be reconnected
during die initial starting procedure.
Increase engine rpm until arO.5 in. signal
is registered on the water manometer. Check
the mercury manometer and record its read-
ing. Decrease the engine rpm and repeat the
above procedure. Average three readings for
best accuracy. To adjust, loosen the locknut
and turn the economy stop screw in or out
until the mercury manometer reads 0.8 in.
(±0.1 in.) when the water manometer reads
0.5 in.
The power stop readings are obtained with
the manometer hooked up as in the previous
procedure. Disconnect and plug the vacuum
line going to the enrichment diaphragm and
the injection unit will operate only on the
power stop. Do not prolong this operation or
spark plug fouling will result.
Increase the engine rpm until a 0.5 in. sig-
nal is reached on die water manometer and
check and record die mercury manometer
reading. Reduce engine speed and repeat die
above operation. Average three readings for
die best results. Check die enrichment dia-
phragm to see that it is not bottoming in die
housing. To adjust die power stop, loosen die
Economy and power stop adjusting screws
locknut and turn die adjusting screw until a
reading of 1.2 in. (±0.1 in.) is reached on die
mercury manometer when die water ma-
nometer reads 0.5 in.
REMOVAL AND INSTALLATION
1. Disconnect the washer vacuum line,
accelerator linkage, electric choke lead wire,
and die bellcrank return spring.
2. Loosen die flexible hose clamp and slide
die hose from the air meter adapter.
ENRICHMENT DIAPHRAGM
LINE (DISCONNECT AND
PLUG FOR POWER STOP CHECK)
CRANKING SIGNAL VALVE LINE
(CONNECT TO VENTURI SIGNAL HOSE)
Manometer installation
MERCURY
MANOMETER
WATER MANOMETER
VENT HOSE (FROM
MAIN CONTROL DIAPHRAGM
VENTURI
SIGNAL HOSE