Section 03 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
ENGINE LACKS ACCELERATION OR POWER
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Weak spark
Check/replace, refer to ELECTRICAL
SYSTEM
Carburetion, jetting too rich/lean
(
carburetor models
)
Check/replace, refer to FUEL SYSTEM
Throttle does not open fully
Check/readjust, refer to FUEL SYSTEM or
ENGINE MANAGEMENT
Low compression
Check/repair, refer to ENGINE
Water in fuel
Check/siphon/replace
Debris in carburetor needle valve
(
carburetor models
)
Check/clean, refer to FUEL SYSTEM
Impeller leading edge damaged
Check/replace, refer to PROPULSION
SYSTEM
Too much engine oil (
4-TEC models
) Siphon or adjust level. Refer to
LUBRICATION
Twisted crankshaft (
DI models
)
Check, refer to ENGINE
Poor fuel quality
Siphon then refill with fresh fuel
Clogged direct injectors (
DI models
)
Remove and clean direct injectors
Clogged fuel injectors
(
fuel injection models
)
Remove and clean fuel injectors
Low fuel pressure
(
fuel injection models
)
Check fuel line and fuel pump pressure
Incorrect throttle position sensor (TPS)
adjustment (
fuel injection models
)
Check and adjust TPS, refer to ENGINE
MANAGEMENT
Improper timing chain alignment
(
4-TEC models
)
Refer to CYLINDER HEAD AND VALVES
Defective supercharger
(
4-TEC Supercharged models
)
Check/repair, refer to INTAKE
Overheated engine See ENGINE OVERHEATS in this chart
RAVE valve does not open
(
if so equipped
)
Check, refer to ENGINE
Engine revs lower than
its maximum operational
RPM
Limp home mode activated
(
fuel injection models
)
Refer to ENGINE MANAGEMENT
Peak performance is
delayed until higher
RPM range is reached
RAVE valve is stuck opened
(
if so equipped
)
Check, refer to ENGINE
56 smr2004-Complete Line Up
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