Timing Tensioner problems of the 1996 Chevrolet S10

Timing chain noise conditions. Inspector from ge capital inspected the vehicle based on the extended warranty contract. Inspector indicated that oil change maintenance had not been maintained on vehicle and indicated oil was very black. Oil changes were done on this vehicle every 3,000 miles. Self-maintained vehicle for oil changes. Last oil change: 35,718. Oil used was western auto oil, 10w30 advan. Technical service bulletin 87-61-21a, April 1998, subj: timing chain noise condition (replace timing chain). Condition: vehicle may exhibit a clattering noise at idle speed originating from the timing chain and front cover area. Chain wear in excess of the maximum travel of the timing chain tensioner may create noise that may be objectional to some customers. Cause: lack of regular maintenance, as ref in owner's manual and the resultant lack of lubrication and buildup of deposits inside the engine may accelerate wear of the timing chain. In addition, there is a small lubrication hole in the front oil passage plug that could become blocked with debris if proper engine maintenance is not followed. Correction: if the owner of the vehicle indicates a noise concern, inspect the timing chain and tension. In addition, confirm oil flow from the front oil passage plug and replace the timing chain, timing chain tensioner, and both the camshaft and the crankshaft sprocket if necessary to correct the noise.