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Depending on the ping I'd say it's a lifter out of adjustment. Do you have an SES light?
You won't believe this because I can't believe it either but I have a 91 grand marquis that pings with low octane fuel. I don't know why but the pinging is audible and very nasty... you'd think for a completely stock motor that the knock sensor would have picked it up before it got that bad!
Relash your lifters just to be certain.
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, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue 
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