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Using too low an octane fuel, incorrect timeing, or carbon buildup. Timing isn't adjustable on the 97 so I would say it is carbon buildup and too low octane or cheap quality fuel. I have gotten "93" octane at cheapy places and still had pinging but gotten regular or mid grade at better stations and not had the slightest hint of ping. Also, check to make sure your plugs and wires are in good shape.

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Q: What causes intermittent pinging on acceleration on your 97 Lincoln Town Car?
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