Toyota 4-Runner 1985 Repair Manual page 133

EMISSION CONTROL SYSTEMS (CARB.) - Exhaust Gas Recirculation (EGR) System
EC-33
EGR Valve
EG R Port
(1 )
EGR Port
EXHAUST GAS RECIRCULATION (EGR) SYSTEM
(California)
BVSV
A03051
EC0999
(2)
EGR Port
EC1050
EC1051
To reduce NOx emission, part of the exhaust gases are recirculated through the EGR valve to the intake manifold
to lower the maximum combustion temperature.
Coolant Temp. BVSV
Throttle Valve
EGR Valve Exhaust Gas
Opening Angle
Below 30°C (86°F)
CLOSED
CLOSED
Not recirculated
(J-K)
-
Positioned below
CLOSED
Not recirculated
~ove
44°C (111°F)
OPEN
EGR port
(J-K)
Positioned above
EGR port
OPEN Recirculated