The Engine Does Not Maintain Idling Speed; Idling Speed Is Unstable; Idling Speed Is Too Low - PIAGGIO 500 cc Service Manual

Fuel injection

3) THE ENGINE DOES NOT MAINTAIN IDLING SPEED

IDLING SPEED IS UNSTABLE

IDLING SPEED IS TOO LOW

Proceed with the following controls:
Presence of anomalies revealed through fuel
injection self-diagnosis
Ignition efficiency
Parameter correctness
Air intake system cleanliness
Intake system seal (infiltrations)
Fuel supply (low pressure)
Analysis of exhaust gas prior to the catalytic converter
9 - 12
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
Spark plug
Ignition timing
Throttle valve position sensor
Stepper
Coolant temperature sensor
Air intake temperature sensor
Air filter
Choke tube and throttle valve
Supplementary air duct and stepper
head-intake manifold
Throttle body-manifold
Air intake hose
Filter box
Fuel pump
Pressure regulator
Fuel filter
Injector capacity
Trimmer value adjustment (CO% adjustment)