Vacuum Chamber Inspection

Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Disconnect the vacuum hose from the cylinder head cover.

Fig 1: Vacuum Hose Of Cylinder Head Cover
Courtesy of MAZDA
Apply negative pressure (-94 kPa {-705 mmHg, -28 inHg}) on the port A for one minute to check for the leakage of negative pressure.

Fig 2: Cylinder Head Cover Port (A)
Courtesy of MAZDA
- If there is air leakage, replace the cylinder head cover. (See TIMING CHAIN REMOVAL/INSTALLATION .)