<VV> What have you done to stop your engine from pinging?

[Richard Widman]

Of course the engine should be deflashed and clean. But that is on the 
outside. One of the biggest causes of pinging is carbon accumulation on 
the piston crowns and the heads, effectively increasing the compression 
ratio while adding hot carbon to the equation. I have effectively 
eliminated pinging in dozens, if not hundreds of cars with a simple 
treatment (sometimes two) of Techron in the gas tank.