1989-Montero · emission system · страница 15 из 38 · Открыть оригинал PDF ↗
2. Alteration or deterioration of ignition or fuel system, or
any type of operating condition which results in engine
misfiring must be corrected to avoid overheating the
catalytic converters.
3. Proper maintenance and tuneup according to manufac-
turer’s specifications should be made to correct the
conditions as soon as possible.
SECONDARY AIR SUPPLY SYSTEM INSPECTION
(1) Disconnect the air supply hose from the air cleaner and
hold a small steel plate at the disconnected hose end to
check air suction.
| Engine coolant tern- perature | Engine state | Air suction |
|---|---|---|
| 20-40°C (68-l 04°F) | Yes | |
| Idling | ||
| 70°C (158°F) or more | No (70 seconds or more after start) | |
| Rapid deceleration from 4,000 rpm | Yes |
Таблица в оригинале
Caution
Note that if secondary air control valve is broken, emission
may blow back.
SECONDARY AIR CONTROL VALVE INSPECTION
(1) Remove the secondary air control valve
(2) Blow in air from the air cleaner side to check that air does
not blow through.
(3) Connect a hand vacuum pump to the secondary air control
valve nipple.
(4) Apply a vacuum of 67 kPa (19.7 in.Hg) and check air
tightness.
(5) Apply a vacuum of 20 kPa (6.1 in.Hg) and blow in air to
check condition as follows.
| Air blow direction | Normal condition |
|---|---|
| Air cleaner side to exhaust manifold side | Air blows through |
| Exhaust manifold side to air cleaner side | Air does not blow through |
Таблица в оригинале
(6) If any fault is found in above checks, replace the
secondary air control valve.
Secondary air control valve specified tightening torque!
50-50 Nm (37-U ft.lbs.)
Оригинальная страница руководства
