Irregular Running Of The Engine With Throttle Valve Slightly Open - PIAGGIO 500 cc Service Manual

Fuel injection
Intake system seal (infiltrations)
Fuel supply (pressure low)
Exhaust system seal (infiltrations)
Analysis of exhaust gas prior to the catalytic converter

6) IRREGULAR RUNNING OF THE ENGINE WITH THROTTLE VALVE SLIGHTLY OPEN

Proceed with the following controls:
Presence of anomalies revealed through injection
self-diagnosis
Air intake system cleanliness
Intake system seal
Ignition system
Parameter reliability
TPS reset carried out correctly
Analysis of exhaust gas taken prior to the catalytic
converter
9 - 14
Intake manifold-head
Throttle body-manifold
Air intake hose
Filter box
Fuel pump
Pressure regulator
Fuel filter
Injector capacity
Manifold-head
Manifold-silencer
Analyser socket
Silencer soldering
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
Air filter
Choke and throttle valve
Supplementary air duct and stepper
Air intake hose
Filter box
Check spark plug wear
Throttle valve position signal
Coolant temperature signal
Air intake temperature signal
Spark lead
Trimmer value adjustment (CO% adjustment)