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Home >> Ford >> 1990 >> Bronco II RWD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Exhaust Gas RECIRCULATION Systems >> Electronic EGR Valve (EEGR)
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Electronic EGR Valve (EEGR)

  1. Ensure all vacuum hoses are correctly routed and connected. Replace any crimped or broken hoses. Ensure there is less than 2.5 in. Hg of vacuum to EGR valve at idle with engine at normal operating temperature.
  2. Install tachometer. Remove and plug vacuum hose at EGR valve. Start engine and idle in Neutral. Note idle speed. Using hand-held vacuum pump, slowly apply 5-10 in. Hg of vacuum to EGR valve. When vacuum is fully applied to EGR valve, engine should do at least one of 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 valve or check for blocked EGR passages if none of above occurs. Reconnect idle air by-pass valve electrical connector. Unplug and reconnect vacuum hose at EGR valve.
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