Troubleshooting - MULTIQUIP MTX SERIES Service Manual

10. TROUBLESHOOTING

Engine
1.Won't start
Fuel is present
but the spark plug
is not sparking.
Fuel and spark
are both present.
Fuel is not being
supplied to the
carburetor.
2.Faulty operation
Too little Good compression
power and no misfiring
Low compression (See "Compression in low" above
Good compression
but misfires
Excessive accumulation of carbon in the combustion chamber.
Engine
overheats Clog exhaust port or muffler.
Faulty spark plug.
Smoke Black smoke
comes from Blue
the muffler smoke
White smoke
(In the winter, the machine may emit white smoke for a while when first started in the morning.
This is not abnormal.)
Engine speed fluctuates
Electricity is being
s u p p l i e d t o t h e
h i g h v o l t a g e
cable.
Electricity is not
being supplied to
the high voltage
cable
Compression is
good
Compression is
low
No fuel in the fuel tank.
Faulty fuel cock operation.
The fuel filter is clogged.
The air hole in the cap on the fuel tank is clogged.
Air is trapped in the fuel line.
Good
compression
Compression
is low
Faulty governor adjustment.
Faulty governor spring.
Faulty fuel flow.
Air being sucked into the fuel line.
The gap in the spark plug tip is clogged.
Carbon is stuck on the spark plug
The spark plug has a short circuit due to faulty
insulation.
The gap in the spark plug is the wrong size.
The stop button switch has a short circuit.
The ignition coil is broken.
The muffler is clogged with carbon.
The wrong fuel was used.
The air cleaner is clogged.
The fuel is contaminated with water or dirt.
The cylinder head gasket is blown or the head is not
correctly tightened.
The piston rings don't fit well.
The cylinder is worn.
The spark plug is not seated tightly.
The valve seat is damaged.
Dirt in the air cleaner.
Air trapped in the fuel line.
Carbon has accumulated in the cylinder.
Faulty ignition coil.
Dirt on the spark plug.
Ignition coil shorts sometimes.
Choke lever wasn't returned to the open position.
Blended fuel (for 2-cycle engines) was used.
Too much oil.
Engine oil leaked into the air cleaner when the
machine was laid down on the wrong side.
Worn piston rings.
The piston rings don't fit well.
Moisture in the gasoline.
The air cleaner is wet.
18