1984 Camaro Z28 Leakdown Test - Pressure Points
To prepare the tester, we pulled up on the regulator knob to unlock it then turned it fully counterclockwise. The tester was then connected to a shop supply of air capable of producing 50-150 psi. (We made the connection with the compressor turned off.) Remember, the regulator will actually control how much of this pressure enters the cylinder.
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