Toyota 4-Runner 1985 Repair Manual page 135

EMISSION CONTROL SYSTEMS (CARB.) - Exhaust Gas Recirculation (EGR) System
EC-35
Above
44°e
Air Filter
INSPECTION OF BVSV
CHECK BVSV BY BLOWING AIR INTO PIPE
(a) Drain the coolant from the radiator into a suitable con-
tainer.
(b) Remove the BVSV.
(c) Cool the BVSV to below 30°C (86°F).
(d) Check that air flows from pipe
J
to the air filter.
(e) Heat the BVSV to above 44°C (111°F).
(f) Check that air flows from pipe J to pipe K.
(g) Apply liquid sealer to the threads of the BVSV and
reinstall.
(h) Fill the radiator with coolant.
If a problem is found, replace the BVSV.
A03053
INSPECTION OF EGR VALVE
1 . REMOVE EGR VALVE
Check the valve for sticking and heavy carbon deposits.
If a problem is found, replace it.
2. INSTALL EGR VALVE WITH NEW GASKET