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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Engine Controls - System/Component Tests - EEC-IV (4.0L)) >> Emission Systems & Subsystems >> Exhaust Gas RECIRCULATION (EGR) >> EGR Valve

EGR Valve

WARNING: This page is about a different car, the 1995 Ford Explorer and 1995 Ford Aerostar. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure all vacuum hoses are correctly routed and securely attached. Replace any crimped or broken hoses. Ensure there is less than one in. Hg vacuum to EGR valve at idle with engine at normal operating temperature.
  2. Install tachometer. Disconnect idle air by-pass valve electrical connector (if equipped). Remove and plug vacuum hose at EGR valve. Start engine. Idle in Neutral. Note idle speed. Using hand vacuum pump, slowly apply 5-10 in. Hg vacuum to EGR valve. When vacuum is fully applied, engine should do one or more of the following:
    • Engine should stall.
    • Idle speed should drop more than 100 RPM.
    • Idle speed should return to normal when vacuum is released.
  3. Repair or replace EGR system if engine does not stall or idle speed does not respond as specified. Reconnect idle air by-pass valve electrical connector. Unplug and reconnect vacuum hose at EGR valve.
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