Starting Difficulties; Engine Start-Up Problems; Engine Stops At Idle; Engine Does Not Hold Idling/ Idling Is Unstable/ Idling Too Low - PIAGGIO MP3 400 i.e. Service Manual

MP3 400 i.e.

Starting difficulties

Possible Cause
Presence of faults detected by the self diagnosis
Start-up speed
End of compression pressure
Power to the spark plug
Fuel supply
Correctness of the parameters

Engine stops at idle

ENGINE DOES NOT HOLD IDLING/ IDLING IS UNSTABLE/ IDLING TOO LOW

Possible Cause
Presence of faults detected by the self diagnosis
Ignition efficiency
Correctness of the parameters
Intake system cleaning
Intake system sealing (infiltrations)
Fuel feed (low pressure)

ENGINE START-UP PROBLEMS

Stepper throttle valve position intake air tempera-
Cleaning of the auxiliary air pipe and throttle valve;
Operation
Pump relay
HV coil
Injector
revolution timing sensor
Air temperature
Coolant temperature
Starter motor and remote control
Battery
Ground connections
End of compression pressure
Spark plug
Shielded cap
HV coil
Revolution timing sensor
Ignition advance
Fuel pressure (low)
Injector capacity (low)
Injector sealing (poor)
Coolant temperature
ture (steps and actual opening)
air filter efficiency
Operation
Pump relay
HV coil
Injector
revolution timing sensor
Air temperature
Coolant temperature
Spark plug
Ignition timing
Throttle valve position sensor
Stepper
Coolant temperature sensor
Intake air temperature sensor
Air filter
Diffuser and throttle valve
Additional air pipe and Stepper
Intake manifold - head
Throttle body - manifold
Intake sleeve
Filter box
Fuel pump
Pressure regulator
Injection
INJEC - 9