Isuzu Rodeo UE. Service manual - part 439
6E2–511
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
positive crankcase ventilation (PCV) valve into the
common chamber.
Crankcase Ventilation System Operation
The primary control is through the positive crankcase
ventilation (PCV) valve. The PCV valve meters the flow at
a rate that depends on the intake vacuum. The PCV valve
restricts the flow when the inlet vacuum is highest. In
addition, the PCV valve can seal the common chamber
off in case of sudden high pressure in the crankcase.
028RV002
While the engine is running, exhaust fuses and small
amounts of the fuel/air mixture escape past the piston
rings and enter the crankcase. These gases are mixed
with clean air entering through a tube from the air intake
duct.
028RW002
During normal, part-throttle operation, the system is
designed to allow crankcase gases to flow through the
PCV valve into the throttle body to be consumed by
normal combustion.
A plugged valve or PCV hose may cause the following
conditions:
f
Rough idle.
f
Stalling of slow idle speed.
f
Oil leaks.
f
Sludge in the engine.
A leaking PCV hose would cause:
f
Rough idle.
f
Stalling.
f
High idle speed.