Chevrolet Corvette 1963 Repair & Tune-Up Manual page 60

Position the fast idle cam follower on the top
step of the cam and adjust the fast idle to 1300
rpm on manual; 1600 rpm on automatic (in
Park).
454 cu in. V8
1. Shut off the air conditioning. Adjust the
idle stop solenoid screw for 800 rpm on man
ual; 600 rpm on automatic (in Drive).
2. Connect the distributor vaccuum hose
and position the fast idle cam follower on the
top step of the cam and adjust the fast idle to
1600 rpm on manual; 1500 rpm on automatic
(in Park).
1975-76
The same preconditions as for 1973 apply.
1. Turn the air conditioning off.
2. Disconnect the idle speed solenoid.
Turn the idle speed screw to adjust for the
lower of the two idle speeds specified on the
underhood tune-up decal. Adjust automatic
transmission cars in Drive with wheels
blocked; manual transmission cars in Neu
tral.
3. Connect the idle speed solenoid. Open
the throttle to extend the solenoid plunger.
4. Use the solenoid plunger to adjust the
idle speed to the higher of the two speeds on
the underhood tune-up decal.
1977-IDLE SPEED
Run the engine to normal operating temper-
ature, A/C off, vacuum advance line discon-
nected and plugged, FUEL TANK line at the
canister disconnected. Place the manual
transmission in neutral; automatic transmis-
sion in drive. Connect a tachometer to the
engine.
NOTE: Make sure the parking brake is on
and the drive wheels are sufficiently blocked
when placing the transmission in drive.
Without A/C
1. Turn the idle speed screw to achieve the
rpm specified on the underhood tune-up de-
cal.
With A/C
1. Turn the idle speed screw to the lower
of the two idle speeds specified on the under
hood tune-up decal.
2. Turn the A/C system on.
3. Disconnect the A/C compressor lead at
the compressor.
4. Open the throttle slightly to allow the
solenoid plunger to fully extend.
TUNE-UP AND PERFORMANCE MAINTENANCE
5. Turn the solenoid screw to higher of the
two idle speeds specified on the underhood
tune-up decal.
6. Reconnect the A/C compressor lead.
1977-IDLE MIXTURE
NOTE: Idle mixture screws have been pre-
set at the factory and capped and should
not require adjustment, however if the need
arises follow the procedure listed below.
1. Set the parking brake and block the
drive wheels.
2. Remove the air cleaner to gain access
to the carburetor, but keep the vacuum hoses
connected.
3. Run the engine to normal operating
temperature with the choke open.
4. Turn the A/C off.
5. Disconnect and plug the vacuum ad
vance hose at the distributor.
6. Check the ignition timing and adjust
as necessary.
7. Using a sharp knife, carefully remove
the plastic caps from the idle mixture screws.
Use extreme caution to avoid bending the
mixture screws.
8. Lightly seat the screws then back out
equally just enough so the engine will run.
9. Place the automatic transmission in
drive or the manual transmission in neutral.
10. Back out each screw (richen) % turn at
/PREPARE VEHICLE FOR ADJUSTMENTS
TURN IDLE SPEED SCREW TO
SET CURB IDLE SPEED TO
SPECIFICATIONS -A/C OFF
IDLE SPEED ADJUSTMENT - WITHOUT SOLENOID
y SOLENOID ENERGIZED -
A/C COMPRESSOR LEAD
DISCONNECTED AT A/C
COMPRESSOR. A/C ON.
A/T TRANSMISSION IN
DRIVE. M/T IN NEUTRAL
ELECTRICAL
CONNECTIO!
©OPEN THRI 1ROTTLE 5UGHTLT TO ALLOW (<? ^X
5OLENOI
no
PLUNGER TO FULIV EXTEND
A/C IDLE SPEED ADJUSTMENT - WITH SOLENOID
Idle speed adjustment (1977-80 M4MC)
55
PREPARE VEHICLE FOR ADJUSTMENTS
JT
I
TURN SOLENOID SCREW TO
ADJUST TO SPECIREO RPM
(RECONNECT A/C COMPRESSOR
LEAD AFTER ADJUSTMENT!
I/ TURN IDLE SPEED SCREW TO
SET CURB IDLE SPEED TO
v SPECIFICATIONS - A/CO*F
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