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Line Pressure Cutback Point (NA4A-Hl)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1994 Mazda MX-5 Miata, 1992 Mazda MX-5 Miata, 1992 Mazda MPV, 1992 Mazda B2200, and 1991 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect oil pressure gauge to governor port. See Fig 1 . Remove vacuum diaphragm hose and plug. Connect vacuum pump and place gauge and pump inside vehicle.
    Fig 1: Connecting Gauge To Governor Port (NA4A-HL)
    G93A24091Courtesy of MAZDA MOTORS CORP.
  2. Accelerate vehicle in "D". Read governor pressure when line pressure drops.
  3. Apply 8 in. Hg to vacuum diaphragm. Accelerate in "D". Record highest pressure reading when line pressure drops. Compare with LINE PRESSURE CUTBACK POINT SPECIFICATIONS  table.
LINE PRESSURE CUTBACK POINT SPECIFICATIONS

Application Applied Vacuum Pressure psi (kg/cm2 )
B2200 EGI Fuel Injection
0 in. Hg 16-24 (1.1-1.6)
8 in. Hg 9-17 (.60-1.2)
B2200 Carbureted
0 in. Hg 20-28 (1.4-1.9)
8 in. Hg 10-18 (.70-01.26)
B2600
0 in. Hg 18-27 (1.26-1.8)
8 in. Hg 11-20 (.76-1.4)
Miata (1990-93)
0 in. Hg 16-24 (1.1-1.6)
8 in. Hg 9-17 (.60-1.2)
MPV
0 in. Hg 16-24 (1.1-1.6)
8 in. Hg 11-20 (.76-1.4)
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