85 Toyota Mr2 Cold Air Intake

1. INSPECT JET BY BLOWING AIR FROM EACH SIDE

Check for stoppage.

EXHAUST GAS RECIRCULATION (EGR) SYSTEM

Mr2 Mk2 Sw20 Handbook

To reduce NOx emissions, part of the exhaust gases are recirculated through the EGR valve to the intake manifold to lower the maximum combustion temperature.

Coolant temp.

vsv

Throttle Valve Opening Angle

Pressure in the EGR Valve Pressure Chamber

EGR Vacuum Modulator

EGR Valve

Exhaust Gas

Below 54°C (129°F)

CLOSED

-

-

-

CLOSED

Not recirculated

Above 60°C (140°F)

OPEN

Positioned above E port

(1)

-

-

CLOSED

Not recirculated

Positioned below E port

(2)

»

CLOSED passage to atmosphere

OPEN

Recirculated (increase)

Remarks: * When the throttle valve is positioned above the E port, the EGR vacuum modulator will close the atmosphere passage and open the EGR valve to increase the EGR gas, even if the exhaust pressure is insufficiently low.

EGR Vacuum Modulator~

ec4036

COLD

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