I have a 2000 323i with the 2.5 straight 6 engine. For the last month I have had problems that seemed to be fuel delivery. I got my check engine light checked, and it said i had a bad fuel pressure regulator and that both camshaft position sensors went off. The problems got worse. A slight ticking started that got louder and louder, and sometimes at what seemed to be random, a large knock would happen. I started to notice a large miss, so I checked the compression in all the cylinders. Every cylinder was fine except number 3. It had less then half the compression then the rest. I can't seem to find what the main problem could be. I have taken several components off and I noticed that the timing chain going from the crankshaft to the cam has slack in it but the tensioner for it seems fine. I need ride to work and in its current state of being apart I can't drive it. Can someone please give me some help or even point me in the right direction? I would greatly appreciate it. Thank you.