I have my front door panels off so that I can install a door lock system. I want to be sure all's good before I put them back on. The passenger door rattles at certain speeds, and it is very annoying when trying to listen to the radio. It seems to come from that cross that works with the window. Or, on the track with the clip thing it seems like perhaps the noise comes from there. It is difficult to isolate because whenever I push on something the noise goes somewhat away, but since they're all connected I'm not sure. Has anyone had any experience with this, or will I not notice the noise with the door panels back on?

For maintenance, I lubricated the sliding, white track. Are there other maintenance items?

Does the window switch go on last? Woops, I forgot!

On another issue, my engine has become louder recently. I'm guessing it's loud lifters or something like that because it's a rattly kinda noise. What can I do for it?

Thanks,
Nathan