2002 Honda Accord mileage: 97,000. The problem is when the car is warm and I hit the pedal repeatedly or between shifting (stick shift), I hear valve pinging. In addition, if I drive the car for a long time on the highway and get off the valve pinging gets worst. I did the following to fix the problem but no success. I changed the plugs, air filter, fuel filter and wires. Your help is appreciated.