Engine Does Not Rev Down; Engine Does Not Return To The Idling Speed/Idling Speed Too High; Exhaust Backfires When Decelerating - Gilera Nexus 500 Workshop Manual

Nexus 500

Engine does not rev down

ENGINE DOES NOT RETURN TO THE IDLING SPEED/IDLING SPEED TOO HIGH

Possible Cause
Presence of faults detected by the self diagnosis
Ignition efficiency
Correctness of the parameters
Intake system sealing (infiltrations)
Fuel feed (low pressure)
Analysis of exhaust fumes before the catalytic converter
Exhaust backfires in deceleration
Possible Cause
Presence of faults detected by the self diagnosis
Correctness of the parameters
Intake system sealing (infiltrations)
Fuel feed (low pressure)
Exhaust system sealing (infiltrations)
Analysis of exhaust fumes before the catalytic converter

EXHAUST BACKFIRES WHEN DECELERATING

Operation
Pump relay
H.V. coil
Injector
revolution timing sensor
Air temperature
Coolant temperature.
Atmospheric pressure
Ignition timing
Throttle valve position sensor
Stepper
Coolant temperature sensor
Intake air temperature sensor
Intake manifold - head
Throttle body - manifold
Intake sleeve
Filter box
Fuel pump
Pressure regulator
Fuel filter
Injector capacity
Trimmer value adjustment (CO % adjustment)
Operation
Pump relay
H.V. coil
Injector
revolution timing sensor
Air temperature
Coolant temperature.
Atmospheric pressure
Throttle valve position sensor
Stepper
Coolant temperature sensor
Intake air temperature sensor
Intake manifold - head
Throttle body - manifold
Intake sleeve
Filter box
Fuel pump
Pressure regulator
Fuel filter
Injector capacity
Manifold - head
Manifold - muffler
Analyser socket
Muffler welding
Trimmer value adjustment (CO % adjustment)
Injection
INJEC - 201