Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2002EXPRESS 1/2 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCAMSHAFT POSITION SENSORADJUSTMENTS
2002 Chevrolet Express 1/2 Ton Van V8-5.7L VIN R
Camshaft Position Sensor: Adjustments
2002 Chevrolet Express 1/2 Ton Van V8-5.7L VIN RSECTION Adjustments
CAMSHAFT RETARD OFFSET ADJUSTMENT
TEST PROCEDURE
You cannot adjust the ignition timing. You may need to adjust the distributor in order to prevent crossfire. To insure proper alignment of the distributor, perform the following:
1. With the ignition OFF, connect the scan tool.
2. Start the engine. Allow the engine to idle until the engine reaches the normal operating temperature.
IMPORTANT: The Cam Retard Offset reading will not be accurate below 1,000 RPM.
3. Increase the engine speed to 1,000 RPM while performing the following steps.
4. Use the scan tool in order to monitor the Cam Retard Offset.
5. If the Cam Retard indicates a value of 0 degrees, the distributor is properly adjusted.
6. If the Cam Retard does not indicate 0 degrees, the distributor must be adjusted.
ADJUSTMENT PROCEDURE
1. Remove the engine cover.
2. With the engine OFF, slightly loosen the distributor hold down bolt.
IMPORTANT: The Cam Retard Offset reading will not be accurate below 1,000 RPM.
3. Start the engine and raise the engine speed to 1,000 RPM.
4. Use the scan tool in order to monitor the Cam Retard Offset.
5. Rotate the distributor as follows:
^ To compensate for a negative reading, rotate the distributor in the counterclockwise direction.
^ To compensate for a positive reading, rotate the distributor in the clockwise direction.
6. Repeat step 4 until 0 degrees is obtained.
7. Turn OFF the ignition.
NOTE: Refer to Fastener Notice in Service Precautions.
8. Tighten the distributor hold-down bolt.
Tighten
Tighten the bolt to 3 N.m (27 lb in).
9. Install the engine cover.
10. Start the engine.
11. Raise the engine speed to 1,000 RPM and view the Camshaft Retard Offset.
TEST PROCEDURE
You cannot adjust the ignition timing. You may need to adjust the distributor in order to prevent crossfire. To insure proper alignment of the distributor, perform the following:
1. With the ignition OFF, connect the scan tool.
2. Start the engine. Allow the engine to idle until the engine reaches the normal operating temperature.
IMPORTANT: The Cam Retard Offset reading will not be accurate below 1,000 RPM.
3. Increase the engine speed to 1,000 RPM while performing the following steps.
4. Use the scan tool in order to monitor the Cam Retard Offset.
5. If the Cam Retard indicates a value of 0 degrees, the distributor is properly adjusted.
6. If the Cam Retard does not indicate 0 degrees, the distributor must be adjusted.
ADJUSTMENT PROCEDURE
1. Remove the engine cover.
2. With the engine OFF, slightly loosen the distributor hold down bolt.
IMPORTANT: The Cam Retard Offset reading will not be accurate below 1,000 RPM.
3. Start the engine and raise the engine speed to 1,000 RPM.
4. Use the scan tool in order to monitor the Cam Retard Offset.
5. Rotate the distributor as follows:
^ To compensate for a negative reading, rotate the distributor in the counterclockwise direction.
^ To compensate for a positive reading, rotate the distributor in the clockwise direction.
6. Repeat step 4 until 0 degrees is obtained.
7. Turn OFF the ignition.
NOTE: Refer to Fastener Notice in Service Precautions.
8. Tighten the distributor hold-down bolt.
Tighten
Tighten the bolt to 3 N.m (27 lb in).
9. Install the engine cover.
10. Start the engine.
11. Raise the engine speed to 1,000 RPM and view the Camshaft Retard Offset.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.