knocking noise at idle

[pimpin da G20]

I just noticed today when i stop at a red light or when i am just sitting there idling i hear a knocking or almost a pinging noise coming from under the hood. When i rev the engine it goes away. The car runs fine and idles right where it should.

[enzo@af]

Try a couple tanks of supreme.

[Koojo]

what year is the car? if its new it then you should just try really good fuel, if its not as new, then it might be something else.

[pimpin da G20]

Yea im starting to think its the gas i put in it because i usually only run premium but one day i only had a few dollars on me and i put in 89 octane gas and the next day i noticed the noise. My car is a 92' by the way.

[Koojo]

Ya im guessing thats also the reason. Switch over to premium and see what happens.