Dodge ram truck 3500 1996 Service Manual page 1317

B R
FUEL
SYSTEM
14 - 83
D I A G N O S I S
AND TESTING
(Continued)
FUEL
INJECTOR
TESTER
FRONT OF ENGINE
AIR TEMPERATURE
SENSOR
CONTAINER
J9514-71
Fig. 82 Typical Fuel Injector Tester
A defective fuel injection pump or misadjusted
pump timing can cause starting problems or prevent
the engine from revving up. I t can also cause:
• Engine surge at idle
• Rough idle (warm engine)
• Low power
• Excessive fuel consumption
• Poor performance
• Low power
• Black smoke from the exhaust
• Blue or white fog like exhaust
• Incorrect idle or maximum speed
Engine power is also effected by the governor set­
ting and performance. Do not attempt to adjust
the governor. I f the governor seals on the exter­
n a l adjustment screw are broken, the fuel rate
may be out of adjustment. The warranty of the
injection pump and the engine may be void if
the seals have been tampered with or removed.
FUEL SHUTDOWN SOLENOID TEST
NOTE: The fuel shutdown (shut-off) solenoid (Fig.
33) and fuel shutdown solenoid relay (Fig. 35) are
not controlled by the powertrain control module
(PCM).
(1) With the ignition switch off, the solenoid shaft
should be down and the injection pump lever should
be i n the shutdown position (no fuel supply to injec­
tion pump) (Fig. 34).
(2) Turn the ignition switch to the CRANK (starter
engage) position and observe the solenoid shaft and
injection pump lever. The shaft should pull up (shaft
SENSOR
ELECTRICAL
CONNECTOR
INTAKE
MANIFOLD
F U E L
(UPPER HALF)
S H U T D O W N
SOLENOID '
SOLENOID ELECTRICAL
CONNECTOR
J9414-93
Fig. 33 Fuel Shutdown Solenoid Location
SHUTDOWN
POSITION
RUN POSITION
FUEL
SHUTDOWN
SOLENOID
J9414-80
Fig. 34 Fuel Shutdown Solenoid Positions
retracted into the solenoid) and the pump lever
should be in the run position (fuel being supplied to
injection pump) (Fig. 34).
(3) Release the ignition key from the CRANK to
the ON position. The shaft should remain i n the up
position and the pump lever should remain in the
run position (fuel being supplied to injection pump)
(Fig. 34). I f the solenoid shaft is not moving, refer to
the following: