I'm looking for a post Chosen fic that does not have Xander in Africa. :P

I remember that he was on a road trip, and for some reason Spike was sent to him as a 'daywalker' of some kind? I have one image, of a shirtless Spike with his head stuck in the engine of a car, bee-bopping to music and getting sunburned on his back. Does this sound familiar to anyone?