5F-8 - BOS / SAV EMISSIONS 90-823225--1 1096
IMPORTANT: Ensure that engine is running at
775 RPM or below. This ensures that the carbure-
tor is not running on the “Off-Idle” circuit.
7. Connect a tachometer to the engine.
8. Plug the vacuum ports on the front of the carbure-
tor. Be sure to only plug one port at a time. When
vacuum port is covered, the engine RPM should
increase. Repeat test on the other port. If vacuum
is not present, a vacuum port may be plugged.
Clean vacuum ports and repeat the entire test.
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9. When test is complete and PVS is determined to
be functioning properly, reconnect all hoses in
vacuum circuit.
Service Procedures
Checking Positive Crankcase
Ventilation (PCV) Valve
1. Start engine and allow it to reach normal operat-
ing temperature.
2. Remove PCV valve from valve cover. Plug the
opening with your finger. A vacuum should be
felt.
3. Stop the engine.
4. Shake the valve to ensure that the internal com-
ponents are free to move.
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