Section 03
TROUBLESHOOTING
Subsection 01
(TROUBLESHOOTING CHART)
SMR2002-020_03_01A.FM
03-01-5
ENGINE MISFIRES, RUNS IRREGULARLY (cont’d)
Rich fuel mixture
Fouled spark plug
• Partially closed choke
(
carburetor models
)
• Check/adjust choke cable
• Flame arrester dirty or restricted
(
if so equipped
)
• Check/replace
• Carburetor adjustment
(
carburetor models
)
• Check/adjust, refer to section FUEL
SYSTEM
• Loose main jet (
carburetor models
)
• Check, refer to section FUEL SYSTEM
• Improper air/fuel rail pressure
(
DI models
)
• Check pressures, refer to ENGINE
MANAGEMENT
• Faulty fuel injector(s)
(
RFI and DI models
)
• Remove and replace fuel
injector(s), refer to section ENGINE
MANAGEMENT
• Faulty direct injector(s) (
DI models
)
• Remove and replace direct
injector(s), refer to section
ENGINE MANAGEMENT
• Defective sensor or MPEM
(
RFI and DI models
)
• Check faulty codes in MPEM
memory, refer to section ENGINE
MANAGEMENT
• Rotary valve shaft seal leaking
(
if so equipped
)
• Check/replace, refer to ENGINE
• Damaged reed valve (
if so equipped
) • Check, refer to
Bottom End
in ENGINE
SECTION
• Leaking crankshaft seal(s) or intake
(
DI models
)
• Pressure check engine, refer to section
ENGINE
• Leak in RAVE valve system
(
DI models
)
• Check, refer to ENGINE MANAGEMENT
• Oil injection pump adjustment
• Check/adjust, refer to section
LUBRICATION SYSTEM
• Worn needles and seals
(
carburetor models
)
• Check, refer to section FUEL SYSTEM
• Excessive rotary valve clearance
(
if so equipped
)
• Check, refer to ENGINE
• Fuel pressure fluctuating (
DI models
) • Inspect fuel pressure regulators. Refer
to ENGINE MANAGEMENT
• High fuel pressure
(
RFI and DI models
)
• Check pump, regulator, injectors, hose
pinchers or if filter is plugged. Replace
if necessary
Start but run poorly
•
RFI and DI models:
Check spark plug
condition, check fault codes in the
MPEM memory, check fuel pressure,
check RAVE valves operation
• Check, refer to section 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
Also fuel injection
misinjecting
•
DI models:
Bent or missing tooth on
encoder wheel
•
RFI models:
Bent or missing tooth on
trigger wheel
• Injector wiring reversed
• Damaged fuel injector
• Check, refer to ENGINE
MANAGEMENT under COMPONENT
INSPECTION AND ADJUSTMENT
• Check, refer to ENGINE
MANAGEMENT
• Check, refer to ENGINE
MANAGEMENT
• Incorrect rotary valve timing
(
if so equipped
)
• Check/adjust, refer to ENGINE
• Excessive rotary valve clearance
(
if so equipped
)
• Check, refer to ENGINE
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Summary of Contents for GTI 5558
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