Section 02 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Check spark plug condition, check
fault codes, check fuel pressure (
RFI
models
).
Check, refer to ENGINE MANAGEMENT
andFUELSYSTEM.
Starts, but runs poorly
Bent or missing tooth on trigger wheel
(
RFI models
)
Check, refer to MAGNETO SYSTEM in
the appropriate ENGINE SHOP MANUAL
Damaged fuel injector
Check, refer to ENGINE MANAGEMENT
Incorrect rotary valve timing
Check/adjust, refer to the appropriate
ENGINE SHOP MANUAL
Also fuel injection
misinjecting
(
RFI models
)
Excessive rotary valve clearance
Check, refer to the appropriate ENGINE
SHOP MANUAL
NOTE: Prior to replacing an ECM, refer to the ENGINE MANAGEMENT section and read carefully the
tests to do before replacing an ECM that could otherwise be good.
ENGINE CONTINUALLY BACKFIRES
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Weak spark Fouled, defective spark plugs
Clean/replace
Spark plugs
Ignition coil leads or wiring reversed
Refer to WIRING DIAGRAM
Incorrect setting
Check/reset, refer to ELECTRICAL
SYSTEM
Ignition timing
Defective trigger wheel/CPS
(
RFI models
)
Check, refer to ENGINE MANAGEMENT
Rotary valve
Incorrect timing
Check/reset, refer to the appropriate
ENGINE SHOP MANUAL
Carburetor
(
if so equipped
)
Carburetion too lean Check, refer to FUEL SYSTEM
ENGINE DETONATION OR PINGING
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Timing too far advanced
Check/reset
Ignition
Sparkplugheatrangetoohigh Check/change to correct range
Engine overheats and exhaust overheats
Check, see ENGINE OVERHEATS in this
section
Engine/exhaust high
temperature
Fuel octane too low of poor fuel quality Use good quality fuel
smr2005-046 31
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