Fuel injection
9 - 12
3) THE ENGINE DOES NOT MAINTAIN IDLING SPEED
IDLING SPEED IS UNSTABLE
IDLING SPEED IS TOO LOW
Proceed with the following controls:
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
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)
Presence of anomalies revealed through fuel
injection self-diagnosis
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
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