[LostKnight]

amandaSky,

There's actually 2 ticking sounds involved with the injectors. The first seems to be directly related to the injectors and is a steady tick that goes up and down in direct relation to the RPM.

There's a second somewhat louder tick, that sounds more metallic, that happens at somewhat irregular intervals. To the best of my knowledge that tick has to do with the fuel pump pressuring up the fuel rails. If you turn the car off and wait a second or two for the fuel system to depressurize you'll hear a sound almost like a marble dropping.

Those two ticks about drove me nuts when I first heard them at about 500 miles on my car, but after reading around on the forum I've discovered that the sounds are normal due to the direct injection and high fuel pressure. It also seems that the ticking seems more prevalent on colder days and with the big wave of low temperatures across the U.S. it's probably colder than usual where you are and the ticking is probably a lot more noticeable.