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EGR Valve

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

  1. Check EGR Valve Function By Applying Vacuum With Hand Pump

    Disconnect Idle Air Control (IAC) valve electrical connector. Remove EGR vacuum supply hose from EGR valve. Plug vacuum supply hose. Start engine and idle with transmission in Neutral. Observe idle speed. Connect a hand vacuum pump to EGR valve. Slowly apply 5-20 in. Hg (17-34 kPa) vacuum to EGR valve. Observe idle speed. If idle speed drops more than 100 RPM with vacuum applied and returned to normal idle speed after vacuum is removed, EGR valve is okay. If idle speed does not drop more than 100 RPM with vacuum applied and return to normal idle speed after vacuum is removed, replace faulty EGR valve.
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