In article .com>,
" > wrote:

> My car has been running quite well for a while. However recently during
> a road trip in Vegas, my engine is pinging when I accelerate. I had a
> full tuneup about 10K ago and an oil change about 2K ago. I thought it
> was bad gas (I always use 87) and have been filling up with Chevron
> lately, but I filled up (from close to an empty tank) at another
> station and the pinging isn't gone. Does anyone know what can cause
> engine pinging and what can be done?
> Thanks

Make sure you have exactly the brand and model of spark plugs listed in
the manual. There are a lot of crappy plugs out there, regardless of
cost, that will crack or foul up in 10K miles. Carbon builds up in them
and then catches fire every time you run the engine hard.

If that fails, have the tune-up work inspected. The only tuning is the
valve clearance. The rest is replacement of worn parts and old fluids.