Recommended Procedure
WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Do not plug hole on Adapter, Crankcase Pressure Test 303-758.
Make sure the engine is at operating temperature. A cold engine gives higher readings. Remove the breather tube from the air cleaner tube. Block both ends of the breather tube with the caps provided in DSL ENG Pressure Test Kit 014-00761 or equivalent.
Install the Adapter, Crankcase Pressure Test 303-758 in the oil fill cap hole. Plumb to the Magnehelic Gauge® in the gauge block. Make sure the Magnehelic Gauge® has been zeroed.
Start the engine and operate at 3,000 RPM. Hold for 30 seconds minimum and take a stabilized reading. Do not block the hole at the top of the restriction tool.