SOMETIMES when my car is idling in teh drive way my car makes like this ong ong ong ong sound then it cuts off then it comes back randomly. Could this be knocking??? The sound just worries me but it doesnt happen all the time...I heard that sound when i first got the car 3 months ago when i was using like arco gas but i switched to shell and havent heard that sound -4until today.
Oh yea the car never makes that sound when i'm driving and giving the car the slightest amount of gas. The sound is only created if i let the car idle. Sound is fairly distinct. again the sound only occurs rarely. Could it be my heat shield?