Section 02 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
ENGINE LACKS ACCELERATION OR POWER
OTHER OBSERVATION
POSSIBLE CAUSE
REMEDY
Weak spark
Check/replace, refer to IGNITION
SYSTEM
Throttle does not open fully
Check/readjust, refer to ENGINE
MANAGEMENT
Low compression
Check/repair, refer to the
1503 4-TEC
ENGINE SHOP MANUAL
Water in fuel
Check/siphon/replace
Impeller leading edge damaged
Check/replace, refer to PROPULSION
SYSTEM
Too much engine oil
Siphon or adjust level. Refer to
LUBRICATION SYSTEM
Poor fuel quality
Siphon then refill with fresh fuel
Clogged fuel injectors
Remove and clean fuel injectors
Low fuel pressure
Check fuel line and fuel pump pressure
Incorrect throttle position sensor (TPS)
adjustment
Check and adjust TPS, refer to ENGINE
MANAGEMENT
Improper timing chain alignment
Refer to CYLINDER HEAD in the a
1503
4-TEC ENGINE SHOP MANUAL
Defective supercharger
Check/repair, refer to the
1503 4-TEC
ENGINE SHOP MANUAL
Overheated engine
See ENGINE OVERHEATS in this chart
Engine revs lower than
its maximum operational
RPM
Limp home mode activated
Refer to ENGINE MANAGEMENT
ENGINE STOPS RUNNING
OTHER OBSERVATION
POSSIBLE CAUSE
REMEDY
Contaminated or inappropriate fuel
Syphon reservoir and refill with fresh fuel
Engine stalls at idle
Air in fuel rail
Refill fuel tank
Engine running out of fuel
Check fuel delivery system for proper fuel
pressure and delivery
Engine start but stops
after approximately
2 seconds
Air in fuel rail
Refill fuel tank
20
smr2005-006
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