What if your engine refuses to start?
An engine that refuses to start or is difficult to start
is very frustrating. More often than not, the problem
is very minor and can be found with a simple and
logical troubleshooting approach.
The following items will help isolate engine starting problems.
Engine Fails to Start
Perform the following spark test to determine if
the ignition system is operating properly.
1. Remove one of the spark plugs.
2. Connect the spark plug wire and connector to the
spark plug and touch the spark plug base to a good
ground like the engine cylinder head. Position the
spark plug so you can see the electrodes.
WARNING
During the next step, do not hold the
spark plug, spark plug wire or conneetor with fingers. The high voltage generated by the ignition system could
produce serious or fatal shocks. Use a
pair of insulated pliers to hold the spark
plug or wire.
3. Crank the engine over with the starter. A fat blue
spark should be evident across the spark plug electrodes.
4. If the spark is good. check for one or more of the
following possible malfunctions:
- Obstructed fuel line or fuel filter.
- Leaking head gasket.
- Low compression.
5. If the spark: is not good, check for one or more of
the foUowing:
- Loose electrical connections.
- Dirty electrical connections.
- Loose or broken ignition coil ground wire.
- Broken or shorted high tension lead to the
spark plug.
- Discharged battery.
- Disconnected or damaged battery connection.
- Neutral, starter lockout or side stand switch
trouble.
Engine is Difficult to Start
Check for one or more of the following possible
malfunctions:
- Fouled spark plug(s).
- Improperly adjusted choke.
- Intake manifold air leak.
- Contaminated fuel system.
- Improperly adjusted carburetor.
- Weak ignition unit.
- Weak ignition coils.
h. Poor compression.
- Engine and transmission oil too heavy.
Engine Will Not Crank
Check for one or more of the following possible
malfunctions:
- Blown fuse.
- Discharged battery,
- Defective starter motor.
- Seized piston(s).
- Seized crankshaft bearings.
- Broken connecting rod.