Celica Coupe L4-107.5 1762cc 1.8L DOHC (7A-FE) (1995)
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EGR Vacuum Modulator: Testing and Inspection
INSPECT EGR VACUUM MODULATOR OPERATION
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Disconnect the vacuum hoses from ports P, Q and R of the EGR vacuum modulator.
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Block ports P and R with your finger.
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Blow air into port Q, and check that the air passes through to the air filter side freely.
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Start the engine, and maintain speed at 2,500 rpm.
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Repeat the above test.
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Check that there is a strong resistance to air flow.
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Reconnect the vacuum hoses to the proper locations.
