1. VISUALLY CHECK HOSES AND TUBES FOR
CRACKS, KINKS, DAMAGE OR LOOSE CONNEC–
TIONS
2. CHECK PAIR SYSTEM WITH COLD ENGINE
(a) The engine coolant temperature should be below
25 C (77 F).
(b) Disconnect the No.2 air hose from the air pipe.
(c) Check that a bubbling noise is heard from the air pipe
at idle.
PAIR REED VALVE INSPECTION
CHECK REED VALVE BY BLOWING AIR INTO PIPE
(a) Apply vacuum to the reed valve diaphragm.
(b) Blow air into a pipe and check that the reed valve is
open.
(c) Release the vacuum and check that the reed valve is
closed.
3. CHECK PAIR SYSTEM WITH WARM ENGINE
(a) Warm up the engine.
(b) With the engine idling, check that a bubbling noise is
not heard from the air pipe.
(c) Race the engine above 2,000 rpm and quickly close
the throttle valve. Check that a bubbling noise stops
momentarily.
PAIR SYSTEM INSPECTION
–ENGINE EMISSION CONTROL SYSTEMS
EG2–153
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