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Engine Controls - On-Vehicle Adjustments: Diagnosis Chevrolet Silverado 2500

Adjustments ~166 words

Inspection

Note. Camshaft retard offset reading will not be accurate with engine speed less than 1000 RPM.

  1. With ignition off, connect scan tool to Data Link Connector (DLC). Start engine and allow it to reach normal operating temperature.
  2. Increase engine speed to more than 1000 RPM. Using scan tool, monitor CAM RETARD OFFSET. If camshaft retard indicates zero degrees, distributor is properly adjusted. Procedure is complete. If camshaft retard is not zero degrees, see «ADJUSTMENT»(ref-149720-S26665091002002102100000) .
  1. Turn ignition off. Slightly loosen distributor hold-down bolt. Start engine. Increase engine speed to more than 1000 RPM.
  2. Using scan tool, monitor CAM RETARD OFFSET. To adjust for a negative reading, rotate distributor counterclockwise. To adjust for a positive reading, rotate distributor clockwise.
  3. Continue to adjust as necessary until zero degrees is attained. Turn ignition off. Tighten distributor hold-down bolt to 18 ft. lbs. (24 N.m). Start engine. Increase engine speed to more than 1000 RPM. Using scan tool, verify camshaft retard offset adjustment.

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