Camshaft Retard Offset Adjustment for Chevrolet Chevy K Pickup - 4WD 1998

The 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 degree + or -2 degree, the distributor is properly adjusted.
6. If the Cam Retard does not indicate 0 degree + or - 2 degree, the distributor must be adjusted.

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° + or - 2° is obtained.
6. Turn the ignition OFF.
7. Tighten the distributor hold-down bolt to 3N·m(25 lb ft).
8. Start the engine, raise engine speed to 1,000 RPM and recheck Camshaft Retard Offset.