How would you perform a cranking vacuum test?
What will be an ideal response?
For the test to be effective, the engine must be sealed off with the throttle plate all the way closed and the crankcase ventilation system plugged. Block off the positive crankcase ventilation (PCV) hose to the air cleaner and disable the ignition system. During cranking, the needle on the gauge should remain steady. This is more important than the amount of vacuum on the gauge.
The engine should produce a minimum of 3 inches of vacuum while cranking, although most engines will produce far more.
Next, pull the PCV valve and cover its opening with your thumb. Cranking vacuum should rise. If it does not, there is a problem with the PCV system.
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