The four valves per cylinder — two intake and two exhaust — were actuated by roller rocker arms which had built-in needle bearings that reduced the friction that occurred between the camshafts and the roller rocker arms which actuated the valves.
To alter cam timing, the spool valve would be activated by the cam timing oil control valve assembly via a signal from the ECM and move to either the right to advance timing or the left to retard timing.
If this occurred, the cam sprocket needed to be replaced.
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As a result, the hydraulically-controlled camshaft could not respond to ECU signals.