EGR Vacuum Modulator

Because exhaust backpressure increases proportionally with engine load, the EGR vacuum modulator uses this principle to precisely control the strength of the vacuum signal to the EGR valve. The typical EGR control system uses two ported vacuum signals from the throttle body. Port E is the first stage ported vacuum signal and Port R is the second stage ported vacuum signal uncovered by the opening throttle valve.

Egr Exhaust Back Pressure

When vacuum is applied from port E, the strength of the vacuum signal applied to the EGR valve will be dependent on the amount of exhaust backpressure acting on chamber A of the vacuum modulator. When vacuum is applied from port R, the strength of the vacuum signal applied to the EGR valve will no longer be dependent on the strength of the exhaust backpressure signal. During this mode, the EGR signal strength is determined solely by

When vacuum is applied from port E, the strength of the vacuum signal applied to the EGR valve will be dependent on the amount of exhaust backpressure acting on chamber A of the vacuum modulator. When vacuum is applied from port R, the strength of the vacuum signal applied to the EGR valve will no longer be dependent on the strength of the exhaust backpressure signal. During this mode, the EGR signal strength is determined solely by the strength of the vacuum signal from port E of the throttle body. The EGR vacuum modulator provides the ability to precisely match EGR flow rate to amount of load applied to the engine.

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Responses

  • Afwerki Gabriel
    What does egr vacuum modulator do 1997 camry?
    6 years ago
  • Leonie
    How is the strength of the vacuum signal controlled?
    4 years ago
  • margaret
    What is principal of vacum modiulator at engine?
    3 years ago
  • ren
    How to check egr vacuum modulator 2003 toyota avalon?
    2 years ago
  • elio
    How does a egr vaccum modulator work?
    1 year ago
  • briffo
    How to test vacuum modulater in toyota?
    1 year ago
  • anita
    What is work modulator in engine operating?
    12 months ago
  • LEE
    How to replace vacuum modulator on toyota avalon 3.0 l?
    3 months ago
  • Venera DeRose
    How does a egr vacuum modulator work?
    3 months ago

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