Ignition Timing
CAUTION:
Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer for instructions. To prevent ignitor and coil damage, DO NOT
allow tachometer terminal to touch ground.
- Ensure engine is at normal operating temperature. Connect timing light to engine. Connect tachometer to engine. See Fig 1.
- Disconnect and plug vacuum hose(s) at distributor sub-diaphragm. See Fig 2. Start engine and ensure idle speed is within specification. See IDLE SPEED SPECIFICATIONS table under IDLE SPEED in this article.
- Note that timing is within specification. See IGNITION TIMING (Degrees BTDC @ RPM) table in this article. Adjust timing by turning distributor. Reconnect vacuum hose(s) and check that advance timing is within specification. See IGNITION TIMING (Degrees BTDC @ RPM) table in this article.
IGNITION TIMING (Degrees BTDC @ RPM)
| Application | Base Timing | Advance Timing |
|---|---|---|
| Tercel | 3 @ 950 | 12-18 @ 950 |