Advertisement
TROUBLESHOOTING
ENGINE
DOES NOT START OR IS HARD TO START
27-2
1.
Fuel
line
Inspection
Check fuel flow to carburetor.
Dotls
fuel
reach
carburetor?
NO
_
.
Clogged fuel line or strainer
•
Faulty fuel valve
•
Clogged fuel tank breather hose
YES
-
GO TO STEP 2.
2.
Spllrk
Plug Inspection
Remove and inspect spark plug.
1
5
the spark
plug wet?
YES
_
.
Flooded
carburetor
•
Thronle valve open
•
Dirty ai
r
cleaner
•
Improperly
adju
sted pi lot screw
•
Starting enrichment (SE) valve stuck open or damaged
NO
- GO
TO
STEP 3.
3. Spark
Test
Perform
spark
test.
Is
there
weak
or
no
spark?
YES
-
.
Faulty spark plug
•
Fouled spark plug
•
loose
or
disconnected ignition system wires
•
Broken or shorted spark plug wire
•
Faulty ignition coil
•
Faulty ignition pulse generator
•
Faulty engine stop switch
•
Faulty
ignition
switch
•
Faulty engine control module (ECM)
NO
- GO TO STEP 4.
4.
Engine
Starting
Condition
Start engine by following
nor
mal procedure.
Does the
engine
stsrt then
stops7
Yes
_
.
Improper SE valve
operation
•
Incorrectlv adjusted ca rbu retor
•
Leaking carburetor insulator
•
Improper
ignition
tim
ing
(Faulty
ECM or ignition pulse generator)
•
Contaminated
fuel
NO
-
GO TO STEP
5.
5.
Cylinder Compression
Test
cylinder
compression.
Is the
compression
low7
YES
_. Valve
clearance
too small
•
Valve stuck
open
•
Worn cylinder and piston rings
•
Damaged
cylinder
head gasket
•
Seiled
valve
•
Improper valve timing
Advertisement
