OK...here is a basic lesson in Pinging....knocking, or also known as pre-ignition. Why does this happen? It ocurrs when the fuel ignites before the spark. Most common cause is using fuel of to low an octane rating. Lower octane fuels ignite easier and burn faster.
If you have a car that is designed to run on 87, but pings when you use it, then I suspect teh following:
1 - Poor fuel quality.
2 - Timing is advanced due to a programmer or tuner.
3 - Wrong type of spark plug. If someone were to swap in a hotter plug, for example
4 - Carbon deposits.
5 - Bad knock sensor
6 - Running lean. A Cold Air Intake could cause this or one of those stupid C&L MAF upgrades.
I have no idea if you car has a knock sensor.
In older, higher mileage cars, you can build up deposits in the compression chambers. This actually can reduce the volume. This increases the pressure and the temperature of the compression chamber which can cause fuel to pre-ignite. The cure is to use higher octane fuel, or clean the deposits.
You might start with a high grade fuel system cleaner such as Chevron's Techron. I fthat does not work, then more extreme measures such as Sefoam can be used. But, I would first rule-out the mechanical issues I mentioned.
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