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EGR Control Valve

Bring engine to normal operating temperature and operate at idle. Disconnect and plug vacuum hose at EGR control valve. See Fig 1 . Engine should run smoothly. Connect vacuum pump to EGR control valve, and apply 5-10 in. Hg. Engine should run rough. If engine does not run rough, clean or replace EGR control valve.

Fig 1: EGR System Component ID (B4000 & Navajo)

Courtesy of MAZDA MOTORS CORP.