Air intake circuit (page 2 of 4)

The aluminium butterfly casing (or injector holder turret) features extremely minute components. The majority of the system sensors and actuators are fitted on it:

1. fuel inlet union,
2. fuel return union,
3. accelerator butterfly position sensor,
4. fuel pressure regulator,
5. intake air temperature sensor,
6. injector,
7. direct current motor for controlling the idle speed,
8. micro-switch recognizing butterfly valve closed position incorporated in the motor (7),
9. butterfly position adjustment screw (not to be tampered with),
10. union for fuel vapour inlet through the active charcoal filter valve,
11. union for recirculation of oil vapours coming from the engine crankcase (blow-by),
12. union for the thermostatic valve vacuum.