Samurai 2WD L4-1324cc 1.3L SOHC 5 Carb 8V (1987)
Positive Crankcase Ventilation: Testing and Inspection
Fig. 16 PCV system schematic
The PCV system, Fig. 16, consists of a PCV valve mounted on the intake manifold connected to a hose that is feed into a hose connecting the air
cleaner to the valve cover. During small throttle opening/high vacuum conditions, crankcase gasses flow from the valve cover thru the PCV valve.
During large throttle openings/low vacuum conditions, crankcase gasses flow from the valve cover to the air cleaner.
DIAGNOSIS
1.
Unstable idle; frequent stalling.
a. PCV valve plugged or stuck. Replace valve.
2.
Oil in air cleaner.
a. PCV system plugged. Replace valve.
TESTING
1.
Disconnect PCV hose at breather hose.
2.
With engine running at idle, place thumb over end of disconnected PCV hose to check for vacuum.
3.
If no vacuum is felt, check for clogged hose or valve. Replace as necessary.
4.
Stop engine and connect new hose to PCV valve. Blow air through hose to verify that air flows with difficulty from cylinder head side to intake
manifold side.
5.
If air flows easily, valve is stuck and must be replaced. Wrap threads of new valve with sealing tape before installing.
6.
Connect PCV valve hose securely.
