My TJ has recently started a slight knocking sound when I crank it, it is quick, and doesn't last maybe 10/15 seconds and goes away. I can rev it up, and it doesn't knock, it's only when it's a cold start, or if it has been sitting for a little bit (say like I run in walmart for a while or something). A buddy of mine said his truck did that, and it was his oil filter?
I don't have a place to change the oil myself, or the time usually so I let a Firestone place here on the base change it for me (I know... I know...) last time I didn't have a problem, this time I noticed it. Could this be it, or anyone have any suggestions? Any recommendations on a filter if that is what's causing it?