Starting difficulties
ENGINE START-UP PROBLEMS
Possible Cause Operation
Presence of faults detected by the self diagnosis Pump relay
HV coil
Injector
Revolution timing sensor
Air temperature
Engine temperature
Start-up speed Starter motor and remote control
Battery
Ground connections
End of compression pressure End of compression pressure
Power to the spark plug Spark plug
Shielded cap
HV coil
Speed-timing sensor
Ignition advance
Fuel system Fuel pressure (low)
Injector capacity (low)
Injector sealing (poor)
Correctness of the parameters Engine temperature
Stepper throttle valve position intake air temperature (steps
and actual opening)
Throttle valve cleaning, air filter efficiency
Engine stops at idle
ENGINE DOES NOT IDLE/ IDLING IS UNSTABLE/ IDLING TOO LOW
Possible Cause
Operation
Presence of faults detected by the self diagnosis Pump relay
HV coil
Injector
Revolution timing sensor
Air temperature
Engine temperature
Ignition efficiency Spark plug
Ignition timing
Correctness of the parameters Throttle valve position sensor
Stepper
Engine temperature sensor
Intake air temperature sensor
Intake system cleaning Air filter
Diffuser and throttle valve
Stepper
Intake system sealing (infiltrations) Intake manifold - head
Throttle body - manifold
Air cleaner joint
Filter box
Fuel system (low pressure) Fuel pump
Pressure regulator
Fuel filter
Injector capacity
Engine does not rev down
ENGINE DOES NOT RETURN TO IDLING SPEED/IDLING SPEED TOO HIGH
Possible Cause
Operation
Presence of faults detected by the self diagnosis Pump relay
Injection Vespa LX 125 - 150 i.e.
INJEC - 154
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