Blow-By Gas Recirculation Diagram - Fiat 1998 Marea Service Manual

Marea-Marea
1998 range

BLOW-BY GAS RECIRCULATION DIAGRAM

5. Idle speed exhaust gas recirculation pipe
6. Calibrated hole
The system controls emission, from the engine block, of vent gases made up of air-fuel mixtures, burnt
gases which leak through piston rings and lubricant oil vapours by recirculating them to the intake.
With the accelerator throttle open, vent gases from the engine block reach the sleeve connecting the air
cleaner-throttle body (3) through pipe (2). This contains a flame trap (1) which prevents combustion
caused by flame flashing back from throttle body (4).
With the throttle closed (engine idling), the vacuum in the intake manifold takes up gas (in limited
quantities) directly through pipe (5) and calibrated hole (6).
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