Section 03 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
03-01-6 SMR2000-042-03-01.FM
ENGINE LACKS ACCELERATION OR POWER
ENGINE STOPS RUNNING
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
• Weak spark • Check/replace, refer to section ELEC-
TRICAL SYSTEM
• Carburetion, jetting too rich/lean
(carburetor models)
• Check/adjust, refer to section FUEL
SYSTEM
• Throttle does not open fully
(carburetor models)
• Check/readjust, refer to section FUEL
SYSTEM
• Low compression • Check/repair, refer to section ENGINE
• Exhaust system restriction • Check/clean
• Water in fuel or oil • Check/siphon/replace
• Debris in carburetor needle valve
(carburetor models)
• Check/clean, refer to section FUEL
SYSTEM
• Impeller leading edge damaged • Check/replace, refer to section PRO-
PULSION SYSTEM
• Twisted crankshaft • Check, refer to section ENGINE
• Clogged direct injectors
(DI models)
• Remove and clean direct injectors
• Low fuel pressure • Check fuel line and fuel pump pressure
• Incorrect throttle position sensor
(TPS) adjustment (DI models)
• Check and adjust TPS, refer to section
ENGINE MANAGEMENT
• Overheated engine • See ENGINE OVERHEATS in this chart
Engine revs lower than its
maximum operational
RPM
• RAVE valve does not open • Check, refer to section ENGINE
Peak performance is
delayed until higher RPM
range is reached
• RAVE valve is stuck opened • Check, refer to section ENGINE
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Engine was running below
2000 RPM. No
maintenance light.
• Electrical noise (DI models) • Refer to section ENGINE MANAGE-
MENT
Engine stalls at idle
• Low air pressure
(DI models) • Check air delivery circuit for leaks
• Check air compressor
Engine start but stops after
approximately 2 sec.
• Engine running out of fuel
(DI models)
• Check fuel delivery system for proper
fuel pressure
• Low air pressure
(DI models) • Check air system (compressor, air/fuel
rail etc.)
To Next Page