Honda 954 Service Manual page 490

ENGINE DOES NOT START OR
HARD TO START
ENGINE LACKS POWER
POOR PERFORMANCE AT LOW
AND IDLE SPEED
ENGINE DOES NOT START OR
1. Check for operation of the fuel pump
I
Normal
I
2. Inspect the fuel flow
I
Normal
I
3. Inspect the fuel injector
I
Normal
I
4. Perform a spark test
I
Good spark
5. Test cylinder compression
I
Compression normal
6. Starting following normal procedure
I
Engine does not start
I
7. Remove and inspect spark plug
21 TROUBLESHOOTING
I S POOR PERFORMANCE AT HIGH
21-1 SPEED
21-2 POOR HANDLING
21 -3
I S
HARD TO START
Abnormal
Abnormal
Abnormal
Weak or no spark
Low compression
Engine starts but
stops
Wet plug
Possible cause
Faulty fuel pump (Section 5 )
Faulty pressure regulator (Section
See section 5
Faulty spark plug
Fouled spark plug
Faulty ECM
Broken or shorted spark plug wire
Faulty ignition switch
Faulty ignition pulse generator
Faulty engine stop switch
Loose or disconnected ignition
system wires
Valve stuck open
Worn cylinder and piston ring
Damaged cylinder head gasket
Seized valve
Improper valve timing
Improper starter valve operation
Intake pipe leaking
Improper ignition timing (Faulty
ignition coil or ignition pulse gen-
Fuel contaminated
Starter valve closed
Throttle valve open
Clogged air cleaner
21-4
21 -4
21-1