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EGR Valve

WARNING: This page is about a different car, the 1995 Mazda B4000, 1995 Mazda B3000, and 1995 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Bring engine to normal operating temperature and operate at idle. Disconnect and plug vacuum hose at EGR valve. Engine should run smoothly.
  2. Connect vacuum pump to EGR valve, and apply 5-10 in. Hg. Engine should run rough. Release vacuum to EGR valve. Engine should return to normal idle speed. If engine does not run rough or does not return to normal idle, clean or replace EGR control valve.
Fig 1: Identifying EGR System Components
G93A80754Courtesy of MAZDA MOTORS CORP.
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