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Page Title:
Table 4-2. Troubleshooting - Continued |
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 Table 4-2. Troubleshooting - Continued
Malfunction
Probable cause
Corrective action
6.
Engine operates erratically
g.
Partly clogged or pinched fuel
g.
Clean and repair lines (para 4-21).
-Continued
lines.
h.
Intake manifold leak.
h.
Inspect gaskets and tighten
manifold stud nuts (para 4-18).
i.
Distributor cap cracked or shorted.
i.
Replace cap (para 4-36).
7.
Engine stalls on idle.
a.
Carburetor throttle valve closes
a.
Adjust carburetor (para 4-19).
too far or idle mixture incorrect.
b.
Carburetor choke remaining
b.
Adjust choke cable (para 4-19).
closed.
c.
Dirt or water in idler passages of
c.
Replace carburetor (para 4-19).
carburetor.
d.
Air leak at intake manifold.
d.
Tighten manifold stud nuts or
replace gaskets (para 4-18).
e.
Spark plugs defective, gaps in-
e.
Clean or replace spark plugs; set
correct.
f.
Ignition timing early.
f.
Reset timing (para 4-36).
8.
Engine( misfires on one or more
a.
Dirty spark plugs.
a.
Clean, adjust. or replace plugs
cylinder.
b.
Cracked spark plug porcelain.
b.
Replace spark plug (para 4-37).
c.
Spark plug wires grounded.
c.
Replace wires.
d.
Spark plug wires incorrectly
d.
Install wires correctly.
installed in cap or at spark plugs.
e.
Distributor cap or rotor burned or
e.
Replace defective parts (para 4-36).
broken.
9.
Engine not idle properly.
a.
Spark plugs dirty or gaps too close.
a.
Clean and adjust spark plugs
b.
Ignition timing incorrect.
b.
Reset timing (para 4-36).
c.
Carburetor idle circuit requires
c.
Adjust carburetor (para 4-19).
adjusting.
10. Engine misses at high speeds.
a.
Spark plugs dirty, defective, or
a.
Clean and set or replace spark
incorrectly gapped.
plugs (para 4-37).
b.
Ignition coil or capacitor weak.
b.
Replace defective parts (para 4-36).
c.
Distributor points sticking, dirty,
c.
Clean adjust or replace points
or improperly adjusted.
d.
Distributor rotor or cap cracked or
d.
Replace defective parts para 4-36).
burned.
e.
Leaking high-tension or spark plug
e.
Replace defective parts.
wires; cracked insulation.
f.
Carburetor choke not adjusted.
f.
Adjust choke (para 4-19).
g.
Defective carburetor accelerating
g.
Replace carburetor (para 4-19).
pump system, dirt in metering
jets, or incorrect float level.
h.
Fuel pump defective, causing lack
h.
Replace fuel pump (para 4-20).
of fuel.
i.
Air cleaner dirty.
i.
Clean air cleaner and refill oil cup
j.
Fuel filter clogged.
j.
Remove and clean strainer (para 4-23).
k.
Weak distributor breaker arm
k.
Replace point set (para 4-36).
spring.
I.
Excessive play in distributor shaft
I.
Replace distributor (para 4-36).
bearing.
11. Engine pings .
a.
Ignition timing early.
a.
Reset timing (para 4-36).
b.
Distributor automatic spark
b.
Replace distributor (para 4-36).
Advance stuck in advance
position or spring broken.
c.
Incorrect fuel.
c.
Drain; use correct fuel (para 4-21).
12. Engine, lacks power
a
Ignition timing late.
a.
Reset timing para 4-36).
b.
Incorrect fuel.
b.
Drain; use correct fuel para 4-21).
c.
Engine running cold.
c
Test thermostat. In cold weather.
cover air intake under driver's
seat.
d.
Insufficient oil or improper grade
d.
Lubricate in accordance with
of oil.
current lubrication order.
4-4
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