FixVault
Home › Mazda › 1997 › B4000 Base › Repair and Diagnosis › Engine Performance › System › Engine Controls - System/Component Tests › Emission Systems & Sub-Systems › Exhaust Gas RECIRCULATION (EGR) › EGR Valve

EGR Valve

  1. Install tachometer. Disconnect IAC solenoid connector. Disconnect and plug EGR valve vacuum supply hose. Start engine and operate at idle with transmission in Neutral. Observe idle speed. Engine should run smoothly.
  2. Connect vacuum pump to EGR valve and slowly apply 5-10 in. Hg. Engine should run rough and idle should drop more than 100 RPM. Release vacuum to EGR valve. Engine should return to normal idle speed. If engine does not run as specified, replace EGR valve.
Fig 1: Identifying EGR System Components
G96D11406Courtesy of MAZDA MOTORS CORP.
Fig 2: Identifying EGR Vacuum Regulator Solenoid
G97J07218Courtesy of MAZDA MOTORS CORP.
About FixVault