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2002, 530i & 3.0Si

  1. Connect first stage of EGR valve to manifold vacuum source with engine at idle. Idle speed should drop 150-300 RPM. If idle does not drop, blow into valve while holding finger over second stage connection. Any leakage indicates EGR valve metal housing is leaking. If test fails to disclose a leak or if valve still does not function, replace valve.
  2. To test EGR valve second stage, remove and plug purge line from charcoal (fuel evaporation) canister (if equipped). Connect secondary crankcase vacuum control hose to second stage of EGR valve with engine running at idle. Idle speed should drop 200-300 RPM or engine stall. If idle does not drop, check EGR valve for leaks and replace if necessary.
  3. Using finger, push up on EGR valve diaphragm. If valve only operates with extreme pressure, remove and clean valve. Before installing valve, check that valve moves 0.08" (2 mm) with vacuum applied to first stage and 0.118" (3 mm) with vacuum applied to second stage.
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