W 100 Pickup L6-225 3.7L (1984)
Idle Speed: Adjustments
Idle Speed Adjustment
Curb Idle Speed Adjustment
HOLLEY 1945 CARBURETOR
1.
Disconnect and plug vacuum hose at EGR valve, then the 3/16 inch diameter control hose at canister.
2.
Remove PCV valve from cylinder head cover and allow to draw underhood air.
3.
Ground carburetor switch with jumper wire, if equipped.
4.
Install tachometer, then start engine and allow to reach normal operating temperature.
5.
Adjust Solenoid Idle Stop, if equipped, as follows:
a. On models with A/C, turn on A/C and set blower on low, then disconnect A/C clutch wire.
b. On models less A/C, connect jumper wire between battery positive terminal and the SIS lead wire. Ensure correct jumper wire installation.
Applying battery voltage to other than correct wire will damage the wiring harness.
c. On all models, open throttle slightly to allow solenoid plunger to extend.
d. Remove adjusting screw and spring from solenoid.
e. Insert 1/8 inch Allen wrench into the solenoid and adjust to correct engine RPM.
f.
Turn off A/C and replace clutch wire or remove jumper wire.
g. Install solenoid screw and spring.
6.
Allow engine to run at idle for one minute. If idle is not as specified, turn adjusting screw to obtain correct RPM.
7.
Turn off engine, connect vacuum lines and remove tachometer. Install PCV valve, then remove jumper wire if equipped. After step 7 has been
completed, idle speed may change slightly. This condition is normal and engine speed should not be readjusted.
HOLLEY 6145 & CARTER BBD CARBURETORS
1.
Disconnect and plug vacuum hose at EGR valve, distributor or carburetor, as required.
2.
On models equipped with carburetor ground switch, connect jumper wire between switch and ground.
3.
On models not equipped with spark control computer (SCC), disconnect and plug vacuum hose from carburetor at heated air temperature sensor
and orifice spark advance control valve (OSAC), if equipped.
4.
On all models, disconnect and plug control hose at canister.
5.
Remove PCV valve from cylinder head cover and allow to draw underhood air.
6.
Connect tachometer, then start engine and allow to reach normal operating temperature.
7.
Adjust Solenoid Idle Stop, if equipped, as follows:
a. On models with A/C, turn on A/C and set blower on low, then disconnect A/C clutch wire.
b. On models less A/C, connect jumper wire between battery positive terminal and the SIS lead wire. Ensure correct jumper wire installation.
Applying battery voltage to other than correct wire will damage the wiring harness.
c. On all models, open throttle slightly to allow solenoid plunger to extend.
d. On Holley models, remove adjusting screw and spring from solenoid, then insert 1/8 inch Allen wrench into the solenoid and adjust to correct
engine RPM.
e. On Carter models, turn adjusting screw on throttle lever to obtain correct engine RPM.
f.
Turn off A/C and reconnect clutch wire or remove jumper, if equipped.
g. Install solenoid screw and spring, if equipped with Holley carburetor.
8.
On models equipped with oxygen sensor feedback carburetor, proceed as follows:
a. Disconnect and ground electrical connector from oxygen sensor.
b. Remove and plug vacuum hose at vacuum transducer on SCC, then install suitable vacuum pump to vacuum transducer and apply 16 inches
of vacuum.
c. Allow engine to run for two minutes. If idle is not as specified, turn adjusting screw to obtain correct RPM.
9.
On models not equipped with oxygen sensor feedback carburetors, proceed as follows:
a. Allow engine to run for one minute.
b. If idle RPM is not as specified, turn idle speed screw to obtain correct RPM.
10.
On all models, turn off engine, connect vacuum lines and remove tachometer. Remove jumper wire and connect oxygen sensor electrical
connector, if equipped. After step 10 has been completed, idle speed may change slightly. This condition is normal and engine speed should not be
readjusted.
Fast Idle Adjustment
HOLLEY 1945 CARBURETOR
1.
Disconnect and plug vacuum hose at EGR valve, then the control hose at canister.
2.
Remove PCV valve from cylinder head cover and allow to draw underhood air.
3.
Ground carburetor switch with jumper wire, if equipped.
4.
Install tachometer, then start engine and allow to reach normal operating temperature.
5.
Open throttle and place fast idle screw on second highest step of fast idle cam.
6.
Open choke fully, then adjust fast idle speed screw to obtain specified RPM.
7.
Return to idle, then reposition adjusting screw on second highest step of fast idle cam to ensure correct RPM. Readjust if necessary.
