Ignition Timing: Adjustments
TEST PROCEDURESThe ignition timing cannot be adjusted. The distributor may need adjusting to prevent crossfire. To insure proper alignment of the distributor, perform the following:
1. With the ignition OFF, install a scan tool to the DLC.
2. Start the engine and bring to normal operating temperature.
IMPORTANT: Cam retard offset reading will not be accurate below 1,000 RPM
3. Increase engine speed to 1,000 RPM.
4. Monitor the cam retard offset.
5. If the cam retard indicates a value of 0°±2°, the distributor is properly adjusted.
6. If the cam retard does not indicate 0°±2° the distributor must be adjusted.
ADJUSTING CAMSHAFT RETARD OFFSET
1. With the engine OFF, slightly loosen the distributor hold down bolt.
IMPORTANT: Cam retard offset reading will not be accurate below 1,000 RPM
2. Start the engine and raise engine speed to 1,000 RPM.
3. Using a scan tool monitor cam retard offset.
4. 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.
5. Repeat step 4 until 0°±2° is obtained.
6. Turn the ignition OFF.
NOTE: Refer to Fastener Notice in Service Precautions.
7. Tighten the distributor hold-down bolt.
Tighten
Tighten the distributor hold-down bolt to 3 N.m (25 lb. ft.).
8. Start the engine.
9. Raise the engine speed to 1,000 RPM and recheck camshaft retard offset.