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EGR Valve

WARNING: This page is about a different car, the 2003 Mazda Tribute. 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 harness connector. Remove and plug vacuum supply hose to EGR valve. Start engine and run at idle with transaxle in NEUTRAL. Observe idle speed. Connect hand vacuum pump to EGR valve and slowly apply 5-20 in. Hg of vacuum. If idle speed drops more than 100 RPM with vacuum applied and returns to normal 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 after vacuum is removed, replace faulty EGR valve.
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