Tro ubleshooting
10
23
Problem Cause(s)
Engine will not start 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.
Engine is difficult to start 1. Engine is cold.
2. Plugged fuel filter.
3. Engine oil viscosity too heavy.
4. Spark plug is fouled.
5. Faulty spark plug or wire.
6. Loose or corroded electrical connections.
7. Stale or improper fuel.
8. Choke (if equipped) not being used or adjusted properly.
Engine misses under load 1. Faulty spark plug.
2. Stale or dirty fuel.
3. Plugged fuel filter.
4. Faulty coil or wire.
Engine vapor locks 1. Poor quality fuel.
2. Very hot weather conditions.
3. Fuel tank vent plugged.
4. Dirt in fuel filter.
Engine runs unevenly 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. Spark plug is fouled.
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