Possible Cause Operation
HV coil
Injector
Revolution timing sensor
Air temperature
Engine temperature
Ignition efficiency Ignition timing
Correctness of the parameters Throttle valve position sensor
Stepper
Engine temperature sensor
Intake air temperature sensor
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
Exhaust backfires in deceleration
EXHAUST BACKFIRES WHEN DECELERATING
Possible Cause Operation
Presence of faults detected by the self diagnosis Pump relay
HV coil
Injector
Revolution timing sensor
Air temperature
Engine temperature
Lambda probe
Correctness of the parameters Throttle valve position sensor
Stepper
Engine temperature sensor
Intake air temperature sensor
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
Exhaust system sealing (infiltrations) Manifold - head
Manifold - muffler
Muffler welding
Engine revs irregularly
ENGINE IRREGULAR PERFORMANCE WITH VALVE SLIGHTLY OPEN
Possible Cause
Operation
Intake system cleaning Air filter
Diffuser and throttle valve
Stepper
Intake system sealing Air cleaner joint
Filter box
Ignition system Spark plug wear check
Parameter reliability Throttle valve position signal
Engine temperature signal
Intake air temperature indicator
Ignition advance
TPS reset successful TPS reset successful
Presence of faults detected by the self diagnosis Pump relay
HV coil
Vespa LX 125 - 150 i.e. Injection
INJEC - 155
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