Exhaust Gas Recirculation System (Blow-By) - Fiat 1998 Marea Service Manual

Engine
Fuel system
16;

EXHAUST GAS RECIRCULATION SYSTEM (BLOW-BY)

This system controls the emission of breather gases from the crankcase which consist of mixtures of air,
fuel vapours and burnt gases which escape from the piston seals and lubricant oil vapours, causing them
to be recirculated and burnt in the engine.
The breather gases coming from the crankcase rise as far as the cylinder head and are directed into two
different intakes:
- at medium-high accelerator butterfly openings, the gases are drawn in by the duct immediately down-
stream of the air flow meter (detail A);
- at small butterfly openings (and, in particular, with the engine idling or decelerating), the gases are
drawn ni through the PCV valve (Positive Crank Ventilation) fitted on the butterfly casing downstream
of the actual butterfly (detail B).
Detail A
44
Marea- Marea Weekend
Detail B
3M50GJ02
3NS0GJ01
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99 update
3N50GJ03
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