Section 03 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
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 encoder wheel/CPS
(
fuel injection models
)
Check, refer to ENGINE MANAGEMENT
Rotary valve
(
if so equipped
)
Incorrect timing
Check/reset, refer to ENGINE
Carburetor
(
if so equipped
)
Carburetion too lean Check, refer to FUEL SYSTEM
Engine
Intake or exhaust valve(s) leak
(
4-TEC models
)
Pressure check engine, refer to ENGINE
ENGINE DETONATION OR PINGING
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Timing too far advanced
Check/reset (
except 4-TEC models
)
Ignition
Sparkplugheatrangetoohigh Check/change to correct range
Engine overheats and exhaust overheats
Check, see ENGINE OVERHEATS in this
section
Fuel octane too low of poor fuel quality Use good quality fuel
Knock sensor disconnected or faulty
(
fuel injection models
)
Check, refer to ENGINE MANAGEMENT
Bad knock sensor connection
(
fuel injection models
)
Check, refer to ENGINE MANAGEMENT
Engine/exhaust high
temperature
Bad ECM connection (
4-TEC models
) Check, refer to ENGINE MANAGEMENT
smr2004-Complete Line Up 55
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