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 Table 4-2. Troubleshooting
Malfunction
Probable cause
Corrective action
1
Engine will not start (No spark
a.
Ignition switch defective
a
Replace switch (para 4-40).
Ammeter shows no discharge
b.
Ignition primary wires or starting
b
Repair or replace and tighten.
Zero reading with ignition switch
motor cables broken or connections
on.)
loose.
c.
Ignition coil primary winding
c.
Replace coil (para 4-38).
open.
d.
Distributor points dirty
d.
Clean and adjust points (para 4-36)
e.
Distributor points not closing
e.
Adjust or replace points (para 4-36)
f.
Loose or corroded ground or
f.
Remove clean reinstall tighten
battery cable connections
cable clamps (para 4-39).
2
Engine will not start (Ammeter
a.
Short-circuited wire between
a.
Repair or replace wire.
shows abnormal discharge with
ammeter and ignition switch.
ignition switch on.)
b.
Short-circuited primary winding
b.
Replace coil (para 4-38).
3
Engine will not start (weak spark
a.
Distributor points not opening
a.
Clean or replace and adjust points
or no spark)
b.
Distributor points pitted or
b.
Clean or replace (para 4-36).
burned.
c.
Distributor capacitor weak
c.
Replace capacitor (para 4-36).
d.
Ignition coil weak
d.
Replace coil (para 4-38).
e.
Primary wire connections loose
e.
Tighten connections.
f.
High-tension wires, spark plug
f.
Dry Thoroughly
wires, or distributor cap wet.
g.
High-tension wires, spark plug
g.
Replace defective parts.
wires, or distributor cap
damaged.
h.
Distributor cap or rotor burned or
h.
Replace defective parts (para 4-36).
broken
i.
Spark plug gaps incorrect
i.
Reset gaps (para 4-37).
j.
Short-circuited secondary circuit in
j.
Replace coil (para 4-38)
coil.
4
Engine will not start (good spark)
a.
Fuel tank empty
a.
Refill tank.
b.
Dirt or water in carburetor or float
b.
Replace carburetor (para 4-19).
stuck.
c.
Carburetor and engine flooded by
c.
Depress accelerator pedal fully.
excessive use of choke
and crank engine with starting
motor; when engine starts,
release throttle and leave choke control in.
d.
Fuel not reaching carburetor
d.
Inspect for damaged or leaky lines
or air leak into line between, tank
and fuel pump.
e.
Dirt in fuel lines or tank
e.
Disconnect lines drain lank and
blow out lines (para 4-21).
f.
Fuel line pinched
f.
Repair or replace line.
g.
Ignition wires incorrectly installed
g.
Install wires correctly
in distributor cap.
h.
Ignition timing incorrect
h.
Reset timing (para 4-36)
i.
Fuel filter clogged
i.
Replace filter (para 4-23)
j.
Fuel pump not pumping
j.
Replace pump (para 4-20)
k.
Choke improperly adjusted
k.
Adjust choke (para 4-19)
5
Engine backfires
a.
Ignition out of time
a.
Reset timing (para 4-36)
b.
Spark plug wires incorrectly
b.
Install wires correctly.
installed in distributor cap or at
spark plugs.
c.
Distributor cap cracked or
c.
Replace cap (para 4-36)
shorted.
6
Engine operates erratically
a.
Improper ignition timing
a.
Reset timing (para 4-36)
b.
Spark plug wires incorrectly
b.
Install wires correctly
installed in distributor cap.
c.
Dirt or water in carburetor
c.
Drain carburetor: clean fuel system
d..
Carburetor improperly adjusted.
d.
Adjust carburetor (para 4-19)
e.
Fuel pump pressure low.
e.
Replace pump (para 4-20)
f.
Fuel filter clogged.
f.
Replace filter (para 4-23)
4-3
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