ALL OF SUDDEN STARTED TO PING NOT TAP OR KNOCK ITS A PINGING WHAT CAUSES THIS
What is your question?
CAR RAN FINE FOR LONG TIME WITH THE CHECK ENGINE LIGHT ON HAD TO SMOG AND FOUND TINY VACUME LEAK THEN PASSED ALL OF THE CAR STARTED GETTING HOTTER TEMP IS FINE NOW AND SO NOW IT PINGS AND SMOKES BUT ONLY SOMETIMS
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Hard to diagnose online without an inspection. At this point you may want to bring it back to the shop. What color smoke? What does it smell like?
Alex