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If it is making the noise under a heavy load, it probably is pinging, . You should check obd 2 codes, could be a faulty knock sensor, ( I think your car has 2) but more likely than not, there are deposits built up on the tops of the pistons, and valves which will make your combustion chamber smaller, and therefore effectively raising compression ratio. A top end engine clean just may help to clear up the problem, and wise advice was given above to run a higher octane fuel. If the noise is gone , or not as frequent with the better fuel, then, you are on the right track.
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No left turn un stoned
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