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Home >> BMW >> 1978 >> 633CSi Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION >> Testing >> Pressure Converter/Transmitter
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Pressure Converter/Transmitter

  1. Start and run engine until normal operating temperature is reached. Ensure all vacuum hoses are connected properly.
  2. Disconnect Red hose from pressure transmitter and check for exhaust gas back-pressure at end of hose. If no pressure is felt, backpressure line or hose is leaking or plugged. Reconnect Red hose.
  3. Pull White hose from pressure transmitter and check for vacuum at end of hose. There should be vacuum. If not, check White hose and connections for leaks. Reconnect White hose.
  4. To check for control pressure on 630CSi, 633CSi and 733i, pull Red and Blue hoses from pressure transmitter. Vacuum should be felt at Blue hose fitting on transmitter. If not, replace pressure transmitter.
  5. To check for control pressure on 320i, disconnect Blue hose from pressure transmitter and check for vacuum at hose connection on transmitter. Vacuum should be felt. If not, replace pressure transmitter.
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