hmm...kinda sounds like my problem too but this time its with the breaks!!!.

I start the car up and i hear this constant ticking sound comming from about the under part of the air filter assembly. sometimes when i drive the car hard and gets up to normal temps. the ticking is really loud. When i put the keys to first position...the ticking comes on but when i apply breaks it goes away...

I am going to try to figure this out...someone has mention to be that it was a bad starter solenoid. I had asked a question about this in this forum but is the starter solenoid the same thing as a starter coil?....

Allen.b