Section 02 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Check spark plug condition, check fault
codes, check fuel pressure.
Check, refer to IGNITION SYSTEM and
ENGINE MANAGEMENT. If some work
has been performed on the unit, make
sure injector wire connectors were not
mixed. Refer to the WIRING DIAGRAM
for wire colors and positions
Starts, but runs poorly
Bent or missing tooth on trigger wheel
Check, refer to ENGINE MANAGEMENT
Injector wiring reversed
Refer to the WIRING DIAGRAM
Also fuel injection
misinjecting
Damaged fuel injector
Check, refer to ENGINE MANAGEMENT
ENGINE CONTINUALLY BACKFIRES
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Weak spark
Fouled, defective spark plugs
Clean/replace
Spark plugs
Ignition coil wiring reversed
Refer to WIRING DIAGRAM
Incorrect setting
Check/reset, refer to ELECTRICAL
SYSTEM
Ignition timing
Defective trigger wheel/CPS Check, refer to ENGINE MANAGEMENT
Engine
Intake or exhaust valve(s) leak
Pressure check engine, refer to the 1503
4-TEC ENGINE SHOP MANUAL
ENGINE DETONATION OR PINGING
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
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
Check, refer to ENGINE MANAGEMENT
Bad knock sensor connection
Check, refer to ENGINE MANAGEMENT
Engine/exhaust high
temperature
Bad ECM connection Check, refer to ENGINE MANAGEMENT
smr2005-006 19
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