Inspection Of Egr Vacuum Modulator

CHECK EGR VACUUM MODULATOR OPERATION

(a) Disconnect the vacuum hoses from ports P and Q of the EGR vacuum modulator.

(b) Block port one side with your finger.

(c) Blow air into another port, and check that the air passes through to the air filter side freely.

Engine at 2,500 rpm

Engine at 2,500 rpm

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(d) Start the engine, and maintain speed at 2,500 rpm.

(e) Repeat the above test. Check that there is a strong resistance to air flow.

(f) Reconnect the vacuum hoses to the proper locations.

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