Electrical/Vacuum Solenoid - Mityvac MI8000 Manual Del Usuario

To determine if a spark delay valve is operating
correctly, the following service procedure should
be used:
1) With the transmission in neutral, set the carburetor
to the fast-idle position, remove the spark-delay valve
and tee your vacu um pump into the hose leading to
the car buretor spark port.
2) Record the vacuum reading, which should be
between 340 to 540 mbar (10 to 16" Hg).
3) Pinch off the vacuum hose and observe if the
gauge maintains the vacuum level. If the gauge
shows that the vacuum drops with the hose pinched
off, the gauge or vacuum hose has an external
leak, which must be corrected.
SERVICE PROCEDURES
1) Disconnect vacuum and electrical con nectors
from the solenoid. Connect the pump to port "B"
and attempt to apply vac uum with pump. Vacuum
should be released through port "A" (FIGURE 10).
2) Using jumper wires, connect negative solenoid
terminal to ground and apply 12 volts to the
positive terminal. Apply vacu um to port "B".
Vacuum should hold and not bleed off. If the
solenoid does not hold vacuum, replace solenoid.
3) With solenoid still energized, move vac uum
pump to port "A". Attempt to apply vacuum.
Vacuum should be released through the air filter
and no vacuum should be present at port "B".
Page Number - 14
sparK DeLaY vaLves (sDv)
eLectricaL /vacuum soLenoiD
4) Now, connect the black side of the spark-delay
valve to the vacuum hose leading to the carburetor
spark port. Connect a section of vacuum hose to
your vacuum pump and attach the other end to the
distributor end of the spark delay valve. Observe
the time in seconds for the gauge to reach 200
mbar (6" Hg), with a 340 to 540 mbar (10 to 16"
Hg) vacuum source. If the vacuum reaches the 200
mbar (6" Hg) level in less than two seconds,
regardless of type, the SDV should be replaced.
When checking the valve, care must be taken to
prevent oil or dirt from getting into the valve as
this will impair its function.
Port "A"
Positive Terminal
FIGURE 10: TYPICAL VACUUM SOLENOID
Air Filter
Port "B"
Form 824357