Engine Does Not Rev Down; Engine Does Not Return To The Idling Speed/Idling Speed Too High; Exhaust Backfires In Deceleration; Exhaust Backfires When Decelerating - PIAGGIO MP3 400 i.e. Service Manual

Injection
Possible Cause

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)

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)
INJEC - 10

EXHAUST BACKFIRES WHEN DECELERATING

MP3 400 i.e.
Operation
Fuel filter
Injector capacity
Operation
Pump relay
HV coil
Injector
revolution timing sensor
Air temperature
Coolant temperature
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
Operation
Pump relay
HV coil
Injector
revolution timing sensor
Air temperature
Coolant temperature
Lambda sensor
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