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Section 02 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
ENGINE STARTS BUT RUNS ONLY AT IDLE SPEED
OTHER OBSERVATION
POSSIBLE CAUSE
REMEDY
The system is in limp home mode
Refer to ENGINE MANAGEMENT and
check the fault codes
Broken or loose throttle cable
Change/readjust
ENGINE MISFIRES, RUNS IRREGULARLY
OTHER OBSERVATION
POSSIBLE CAUSE
REMEDY
Fouled, defective, worn spark plugs
Check/verify heat range/gap/replace
Faulty ECM or MPEM
Check, refer to ENGINE MANAGEMENT
Defective trigger wheel/CPS
Check, refer to ENGINE MANAGEMENT
Bad ignition coil wiring
Check wiring condition and proper
grounding of ignition coil
Faulty ignition coil, or bad connector
Check coil. Refer to ENGINE
MANAGEMENT or ELECTRICAL
SYSTEM
Weak spark
Poor engine ground
Check/clean/repair
Low fuel pressure
Check pump, regulator, injectors and hose
pinchers or if filter is plugged. Replace
if necessary
Stale or water fouled fuel
Check/siphon and refill
Fuel filter dirty or restricted
Check/clean/replace
Clogged fuel injectors
Remove and clean fuel injectors
Lean fuel mixture
Dry spark plug (except
when water fouled)
Defective sensor or ECM
Check faulty codes in ECM memory, refer
to ENGINE MANAGEMENT
Flame arrester dirty or restricted
Check/replace
Faulty fuel injector(s)
Remove and replace fuel injector(s), refer
to ENGINE MANAGEMENT
Defective sensor or ECM
Check fault codes. Refer to ENGINE
MANAGEMENT
Fuel pressure fluctuating
Inspect fuel pressure regulator. Refer to
FUEL SYSTEM
Rich fuel mixture
Fouled spark plug
High fuel pressure
Check pump, regulator, injectors or if filter
is plugged. Replace if necessary
18
smr2005-006
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