Prizm L4-108 1.8L DOHC VIN 8 MFI (1995)
EGR Vacuum Modulator: Testing and Inspection
EGR Vacuum Modulator Check
EXHAUST GAS RECIRCULATION VACUUM MODULATOR CHECK
1. Remove vacuum hoses "P," "Q" and "R" from modulator.
2. Plug tubes "P" and "R" with your finger.
3. Blow air into tube "Q." Air should flow to the air filter side freely.
4. Start engine and maintain engine speed at 2,500 RPM. Repeat Steps 1 through 3. There should be a strong resistance to air flow now.
5. Reconnect vacuum hoses to their proper locations.
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If EGR vacuum modulator fails this test, replace modulator.
