1. GENERAL INFORMATION
TROUBLESHOOTING
ENGINE WILL NOT START OR IS HARD TO START
Possible cause
1. Check for operation of the fuel pump Abnormal Faulty fuel pump
Normal
2. Inspect the fuel flow Abnormal Faulty pressure regulator
Normal
3. Inspect the fuel injector Abnormal Faulty injector
Normal
4. Perform spark test Weak or no spark Faulty spark plug
Fouled spark plug
Faulty ECU
Good spark Broken or shorted spark plug wire
Faulty ignition switch
Faulty ignition pulse generator
Loose or disconnected spark plug
wire
5. Test cylinder compression Low compression Valve stuck open
Worn cylinder and piston ring
Damaged cylinder head gasket
Compression normal Seized valve
Improper valve timing
6. Starting following normal procedure Engine start Intake pipe leaking
but stops Improper ignition timing (Faulty
ignition coil or ignition pulse
generator)
Engine does not start Fuel contaminated
7. Remove and inspect spark plug Wet plug Throttle valve open
Clogged air cleaner
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