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1970-73 All Models (Ported EGR Valve)

WARNING: This page does not describe the selected car, but rather 23 other vehicles, including the 1979 BMW 733i, 1979 BMW 633CSi, 1979 BMW 320i, 1978 BMW 733i, and 1978 BMW 633CSi. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure engine is at normal operating 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 runs rough or 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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