EGR Backpressure Transducer: Testing and Inspection

EGR VACUUM MODULATOR INSPECTION:
- INSPECT EGR VACUUM MODULATOR OPERATION.
- Disconnect the vacuum hoses from ports P and Q of the EGR vacuum modulator.



- Block one port side with your finger.
- Blow air into the other port, and check that air passes through to the air filter side freely.
- Start the engine, and maintain speed at 2,500 rpm.



- Repeat the above test. Check that there is a strong resistance to air flow.
- Reconnect the vacuum hoses to the proper locations.