Jeep 1979 CJ-5 Technical & Service Manual page 205

16-6 IGNITION SYSTEM
SERVICE DIAGNOSIS (Continued)
Condition
Possible Cause Correction
ENGINE RUNS ONLY
(1)
Open in resistance wire or
( i )
Repair resistance wire
WITH KEY IN START excessive resistance
Repair resistance wire
POSITION
ENGINE CONTINUES
(1)
Defective starter solenoid
( i )
Replace solenoid
TO RUN WITH KEY
( i )
Replace solenoid
O F F
(2) Defective ignition switch
(2) Replace ignition switch
ENGINE DOES NOT
(1)
Spark plugs fouled or faulty
(1)
Clean and gap plugs. Replace as
OPERATE SMOOTHLY
(1)
required
AND/OR
(2)
Ignition cables faulty
(2)
Check cables. Replace as
ENGINE MISFIRES
required
AT HIGH SPEED
(3)
Spark advance system(s) faulty
(3)
Check operation. Repair as
required
(4)
I-terminal shorted t o starter
(4)
Replace solenoid
terminal in solenoid
(4)
Replace solenoid
(5)
Trigger wheel pin missing
(5) Install pin
(6) Distributor leads installed in
(6)
Install leads correctly
wrong sockets
Install leads correctly
EXCESSIVE FUEL
(1) Incorrect ignition timing
(1) Check timing. Adjust as required
CONSUMPTION
Check timing. Adjust as required
(2) Spark advance system (s) faulty
(2) Check operation. Repair as required
ERRATIC TIMING
(1)
Faulty vacuum or centrifugal
(1) Check operation. Replace if
ADVANCE advance assembly
required
TIMING NOT (1) Defective vacuum advance unit
(1) Replace vacuum advance unit
AFFECTED BY
(1) Replace vacuum advance unit
VACUUM (2) Sensor pivot corroded
(2) Clean pivot
INTERMITTENT (1) Loose or corroded terminals
(1) Tighten terminals, remove
OPERATION
(1)
corrosion, apply electrical
grease
(2) Defective sensor
(2) Perform sensor tests
(3) Defective control unit
(3) Perform control unit tests
(4)
Loose ground connector
(4). Clean and tighten ground connection
in distributor
Clean and tighten ground connection
(5) Wires t o distributor shorted (5) Check for frayed, pinched or burned
together or t o ground wires
9 0 0 6 5 B