Pinging

[Guest]

1999 boxster 40k miles. i run only high grade gas with no ethanol. I have a pinging that sounds like valves. it is not all the time, but often enough to be noticeable and irritating.

should i try a gas additive / cleaner?

any ideas appreciated.

You guys are scaring me with all this IMS junk.

[pk2]

If your trying to raise your octane ethanol is extremely corrosive and not the best. Many people avoid it like the plague and seek out pure gasoline. Personally I use toluene to avoid potential detonation but I have some unique circumstances. You can also throw a couple of gallons of 100 oct. It's debatable how real 100 oct is.

If you have "pinging" in the traditional sencs of the word, that means detonation and should never occur. If you got it and can't figure out why, get it to a shop. Could be as simple as the knock sensor. Usually under load is a syncopative ping like popcorn. Valves will have a rattle sometimes on cold start up, don't worry about that. That will be obvious because it is in direct time with engine rpms.

regards, pk