1987-Montero · Vol2 a · страница 132 из 284 · Открыть оригинал PDF ↗
- Service Adjustment Procedures
CHECKING NEGATIVE PRESSURE ADVANCE EQUIPMENT
1. Set the timing light.
2. Start the engine and allow it to idle.
3. Pull out the vacuum hose from vacuum controller and attach
vacuum pump to nipple.
4. Check the advance while slowly applying negative pressure to
the vacuum pump. If the advance is smooth when accompa-
nying the increase in negative pressure, this is normal.
| Symptom | Assumed causes |
|---|---|
| Excessive advances | Weakness of vacuum controller spring |
| Sudden advance rise | Broken spring |
| Insufficient advance or large hysteresis | Impaired movement of breaker base |
| No advance | Broken diaphragm |
Таблица в оригинале
5. If the malfunction indicators above are confirmed, dismantle
and check the distributor.
6. Allow the engine to idle and then turn the ignition switch to
OFF.
7. Remove the vacuum pump and attach the vacuum hose to the
vacuum controller nipple.
8. Remove the timing light.
SPARK PLUG TIEST
NOUGIHB
Connect the spark plug to the high tension cable, ground outer
electrode (main body), and crank engine. In the atmosphere, only
short sparks are produced because of small discharge gap. If the
spark plug is good, however, sparks will occur in discharge gap
(between electrodes). In a defective spark plug, no sparks will
occur because of leak of insulation puncture.
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