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Troubleshooting
Problem
Engine will not start
Engine is difficult to start
Engine misses under load
Engine vapor locks
Engine runs unevenly
22
1.
Battery has low voltage.
2.
Loose or corroded battery connections.
3.
Fuse is blown.
4.
Spark plug wire is loose or disconnected.
5.
Faulty spark plug or coil.
6.
No Fuel or improper fuel.
7.
Plugged fuel filter.
8.
Defective starter solenoid.
9.
Open-circuit in wiring.
1.
Engine is cold.
2.
Plugged fuel filter.
3.
Carburetor not adjusted properly or dirty.
4.
Engine oil viscosity too heavy.
5.
Spark plug is fouled.
6.
Faulty spark plug or wire.
7.
Loose or corroded electrical connections.
8.
Stale or improper fuel.
9.
Choke (if equipped) not being used or adjusted properly.
1.
Faulty spark plug.
2.
Stale or dirty fuel.
3.
Plugged fuel filter.
4.
Faulty coil or wire.
1.
Poor quality fuel.
2.
Very hot weather conditions.
3.
Fuel tank vent plugged.
4.
Dirt in fuel filter.
1.
Loose electrical connections.
2.
Choke (if equipped) or throttle cable sticking.
3.
Fuel line or fuel filter plugged.
4.
Stale or dirty fuel.
5.
Improper fuel.
6.
Air cleaner element plugged.
7.
Carburetor not adjusted correctly.
8.
Spark plug is fouled.
Cause(s)
Continued on next page
10
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