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1996 S10, 4.3L, 152k, Engine started pinging under moderate acceleration on 1996 Chevrolet S10

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No Check Engine Light. Have replaced wires and plugs. Chilton's Manual says that there are no adjustments with this particular ignition system.
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could be an egr valve. too much temp in the cylinders. could also be a carbon build up as well. what kind of fuel do you use?? many possibilities.

Roy
I switched to 89 octane, but that made no discernible difference. Also it pings as soon as I start it and drive away while the engine is still cold.