Pining noise, 2 area that will make a pinging noise, the fuel system is lean, the engine is running hotter than normal, and for this type of engine you would have to include low engine oil . The pinging noise is very much related to fuel consumption. It would also be good to check for any code that is stored.
Check the radiator low fluid level will cause the engine to run hotter , and the check engine oil level. .
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