LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 1985 >> Cressida 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> EGR System - Gasoline >> Component Testing >> Vacuum Modulator
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Vacuum Modulator

  1. Disconnect vacuum hoses from ports "P", "Q" and "R" of vacuum modulator. Plug ports "P" and "R" (2 ports on same side) and blow through port "P" (single port on opposite side). Air should escape freely from filter.
  2. Start engine and run at 2500 RPM. Repeat blowing test. There should be strong resistance to air flow through modulator. If not, replace modulator. Reconnect vacuum hoses to proper locations.
scientia non olet · About LEMON Manuals