LX 450 L6-4.5L (1FZ-FE) (1996)
EGR Vacuum Modulator: Testing and Inspection
EGR VACUUM MODULATOR INSPECTION
1. Inspect and clean EGR vacuum modulator filter.
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Remove the cap and filter.
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Check the filter for contamination or damage.
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Using compressed air, clean the filter.
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Reinstall the filter and cap.
HINT: Install the filter with the coarser surface facing the atmospheric side (outward).
2. Disconnect vacuum hoses from EGR vacuum modulator.
3. Inspect EGR vacuum modulator operation.
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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. Check that there is a strong resistance to air flow.
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If operation is not as specified. replace the vacuum modulator.
4. Reconnect vacuum hoses to EGR vacuum modulator.