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Integral BACKPRESSURE (IBP) Transducer EGR Valve

  1. Ensure all vacuum hoses are correctly routed and securely attached. Replace any crimped or broken hoses. Ensure there is no vacuum to EGR valve at idle. Install tachometer. Plug tailpipe(s), leaving 1/2" diameter opening to allow exhaust to escape. Remove and plug vacuum supply hose from EGR valve.
  2. Start engine and idle in neutral. Note idle speed. Using hand vacuum pump, slowly apply 5-10 in. Hg of vacuum to EGR valve. 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. Replace EGR valve if none of the above occurs. Reconnect idle air by-pass valve electrical connector. Unplug and reconnect vacuum hose at EGR valve.
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