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The new question should be : I have a motor that supposed to run on regular, but it pings. What should I do?

Kevin


Check the timing. An engine made for running on regular, if run on premium, to get any advantage of the higher octane needs to run at slightly different time. But when you pour regular into it, it pings. If it pings with regular but not on premium, retard the timing. That is only true if the engine is made to run on regular.