Since it's fuel injected AND you're getting an audible ping AND no SES light then I doubt it's your timing. There are routines in the code that test the knock sensor by advancing the timing until knock counts occure, if that test doesn't complete then it does it again with more advance. If no counts are detected the ecm thinks the knock sensor is bad and will set a code 43 and the car will run like absolute arse. It'll stop controlling spark so you'll be using the base timing and then a little more at a specific rpm, can't tell you how much it is or where cause I forget.
I'm back to my idea about lifters. You should set the lash on them.
Could the pinging be an exhaust leak near the engine? Sometimes they sound like pinging metal. Do a full check-up and bring it to a mechanic and pay him $20 to find out what's wrong with the car. I used to do this when I had no idea what I was doing. Saved me a lot of headaches and down time.
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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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