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Usually when knock sensors fail the ECM will substitute the failed sensor with a predetermined value or go into "limp in mode". In the case of a knock sensor the ECM would bring the timing back to a safe point to prevent pinging. Usually 964 ping is caused by a broken distributor belt. You checked the belt. Is it possible that it jumped? Remove both distributor caps, rotate the engine while watching both rotors. Make sure the rotors line up with the index marks on the distributor housing.
If that checks ok, disconnect the ignition final stages one at a time and drive the car and see if the ping is gone.
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