Camshaft Retard Offset Test
The ignition timing cannot be adjusted. The distributor may need adjusting
to prevent crossfire. To insure proper alignment of the distributor, perform
the following:
- With the ignition OFF, install the scan tool.
- Start the engine and bring to normal operating temperature.
Important: Cam Retard Offset reading will not be accurate below 1000 RPM
- Increase engine speed to 1000 RPM.
- Monitor the Cam Retard Offset.
- If the Cam Retard indicates a value of 0° ± 2°,
the distributor is properly adjusted.
- If the Cam Retard does not indicate 0° ± 2°,
the distributor must be adjusted.
Adjusting Camshaft Retard Offset
- With the engine OFF, slightly
loosen the distributor hold down bolt.
Important: Cam Retard Offset reading will not be accurate below 1000 RPM
- Start the engine and raise engine speed to 1000 RPM.
- Using a scan tool monitor Cam Retard Offset.
- Rotate the distributor as follows:
4.1. | To compensate for a negative reading, rotate the distributor in
the counterclockwise direction. |
4.2. | To compensate for a positive reading, rotate the distributor in
the clockwise direction. |
- Repeat step 4 until 0° ±2° is obtained.
- Turn the ignition OFF.
- Tighten the distributor hold-down bolt to 3N·m(25 lb. ft.).
- Start the engine, raise engine speed to 1000 RPM and recheck
Camshaft Retard Offset.