The Engine Does Not Turn Over On Idling Speed; Idling Speed Too High; Backfiring In Deceleration - PIAGGIO 500 cc Service Manual

4) THE ENGINE DOES NOT TURN OVER ON IDLING SPEED

IDLING SPEED TOO HIGH

Proceed with the following controls:
Presence of anomalies revealed through injection
self-diagnosis
Ignition efficiency
Parameter correctness
Intake system seal (infiltrations)
Fuel supply (pressure low)
Analysis of exhaust gas prior to the catalytic converter

5) BACKFIRING IN DECELERATION

Proceed with the following controls:
Presence of anomalies revealed through injection
self-diagnosis
Parameter correctness
Pump relay (see page 9-41)
H.V. coil (see page 9-68)
Injector (see page 9-62)
Phase revolutions sensor (see page 9-64)
Air temperature
Coolant temperature
Atmospheric pressure
Ignition timing
Throttle valve position sensor
Stepper
Coolant temperature sensor
Air intake temperature sensor
Head-intake manifold
Throttle body-manifold
Air intake hose
Filter box
Fuel pump
Pressure regulator
Fuel filter
Injector capacity
Trimmer value adjustment (CO% adjustment)
Pump relay (see page 9-41)
H.V. coil (see page 9-68)
Injector (see page 9-62)
Phase revolutions sensor (see page 9-64)
Air temperature
Coolant temperature
Atmospheric pressure
Throttle valve position sensor
Stepper
Coolant temperature sensor
Air intake temperature sensor
Fuel injection
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