ENGINE ADJUSTMENTS -1999 GMC Sierra 1500
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Adjusting Camshaft Retard Offset
Turn ignition off. Slightly loosen distributor hold-down bolt. Start engine. Increase engine speed to more than 1000 RPM.
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.
Continue to adjust as necessary until zero degrees plus or minus 2 degrees is attained. Turn ignition off. Tighten distributor hold-down bolt to 25 ft. Lbs. (34 N.M). Start engine. Increase
engine speed to more than 1000 RPM. Using scan tool, verify camshaft retard offset adjustment.
Monday, January 2nd, 2012 AT 11:40 PM