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All Models (Ported EGR Valve)

WARNING: This page does not describe the selected car, but rather 61 other vehicles, including the 1998 Audi Cabriolet, 1997 Audi Cabriolet, 1997 Audi A8, 1997 Audi A6, and 1997 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure engine is at normal temperature. Disconnect vacuum hose at EGR valve. Connect a hand-held vacuum pump to EGR valve. Start engine. Apply vacuum to EGR valve. If engine stalls and EGR valve holds vacuum, EGR valve is functioning properly.
  2. Connect a vacuum gauge to EGR hose. Increase engine speed to about 3000 RPM. If vacuum is shown on gauge, system is functioning properly.
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