Crown Vic 103,000 miles (all freeway) CNG 4.6L Modular Engine - Just cleaned out the fuel lines, injectors replaced, coils replaced, plugs replaced all this but still getting a detonation (pinging) whenever adding load (acceleration). One tech is saying I need to tear down the engine ($900) to see what is wrong with the bottom end (wouldn't just checking the oil for metal particles be a better first step
) and another tech is suggesting I decarbon the the valves ( which kinda makes sense since the carbon would tend to create an uncoodinated combustion process) with a chemical **ent (seafoam).
What should the first step be ? Help !

What should the first step be ? Help !
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