Fiat Bravo Service Manual page 117

Bravo-Brava igji^v Engine
Fuel system
10.
BLOW-BY GAS RECIRCULATION DIAGRAM
P4A15AJ01
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.
Gases emerge from outlet (1), which contains a flame trap (5) designed to prevent combustion caused
by flame flashing back from the butterfly valve case.
With the accelerator throttle open, gases are taken in upstream of the throttle through intake (3) located
on the air shroud to the butterfly valve case.
With the throttle closed (engine idling), the vacuum in the intake manifold takes up gas (in limited
quantities) directly through the pipe (2) and calibrated hole (4).
Copyright Fiat Auto 15