Sea-doo RX Shop Manual page 52

Section 03 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
ENGINE MISFIRES, RUNS IRREGULARLY (cont'd)
OTHER OBSERVATION
Lean fuel mixture
Dry spark plug (except
when water fouled)
Rich fuel mixture
Fouled spark plug
Start but run poorly
Also fuel injection
misinjecting
03-01-4
POSSIBLE CAUSE
• Low fuel level
• Stale or water fouled fuel
• Fuel filter dirty or restricted
• Carburetion dirty or out of adjustment
(carburetor models)
• Clogged direct injectors
(DI models)
• Defective sensor or MPEM
(DI models)
• Leaking crankshaft seal(s) or intake
(carburetor models)
• Restricted fuel valve
(carburetor models)
• Loose carburetor
(carburetor models)
• Partially closed choke
(carburetor models)
• Carburetor adjustment
(carburetor models)
• Loose main jet (carburetor models)
• Improper air/fuel rail pressure
(DI models)
• Direct injector(s) (DI models)
• Defective sensor or MPEM
(DI models)
• Damaged reed valve
• Leaking crankshaft seal(s) or intake (DI
models)
• Leak in RAVE valve system
(DI models)
• Oil injection pump adjustment
• Worn needles and seals
(carburetor models)
• Fuel pressure and/or air pressure fluc-
tuating (DI models)
– DI models: check spark plug condition,
check fault codes in the MPEM mem-
ory, check fuel pressure, check RAVE
valves operation.
– DI models: Bent or missing tooth on
encoder wheel.
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REMEDY
• Check/refill
• Check/siphon and refill
• Check/clean/replace
• Check/clean/adjust, refer to section
FUEL SYSTEM
• Remove and clean direct injectors
• Check faulty codes in MPEM memory, re-
fer to section ENGINE MANAGEMENT
• Pressure check engine, refer to section
ENGINE
• Check/replace
• Tighten carburetors
• Check/adjust choke cable
• Check/adjust, refer to section FUEL
SYSTEM
• Check, refer to section FUEL SYSTEM
• Check pressures, refer to ENGINE
MANAGEMENT
• Remove and replace direct injector(s),
refer to section ENGINE MANAGE-
MENT
• Check faulty codes in MPEM memory,
refer to section ENGINE MANAGE-
MENT
• Check, refer to Bottom End in ENGINE
SECTION
• Pressure check engine, refer to section
ENGINE
• Check, refer to ENGINE MANAGEMENT
• Check/adjust, refer to section LUBRI-
CATION SYSTEM
• Check, refer to section FUEL SYSTEM
• Inspect fuel and air pressure regulators.
Refer to ENGINE MANAGEMENT
• Check, refer to section ENGINE MAN-
AGEMENT. If some work has been per-
formed on the unit, make sure injector
wire connectors were not mixed. Refer
to the wiring diagram for wire colors and
positions
• Check, refer to ENGINE MANAGE-
MENT under Component inspection
and adjustment
SMR2000-042-03-01.FM