Still trying to conquer the smoking problem on my 220D. The car spits tons of unburned diesel fumes out the pipe, but has great compression on all 4 cylinders.

Here are some questions:

1. I checked the timing chain, and it seems very stiff to the touch and in good shape. I did not actually take any measurments, but I can only deflect it from its path by about 3-4mm by pulling it with my finger. This seems like an acceptable level of slack and I do not think it would be affecting the timing of the vehicle.

2. While the valve cover was off, I noticed that the number 2 cylinder's cam mount (??) was aligned poorly. Please see the pictures for a better understanding:





This looks a bit odd to me, but I dont see how it would be causing any problems?

3. I was replacing my clear fuel filter, because it looked sooty, and I accidently pulled the line from its source. Looky what I have on my shop floor:



Any idea where this connects? I obviously know to connect the filter end to a hard line around the IP ... but the other end??

4. I just got my injectors back from the shop. They were found to all be out of whack (squirting in a wierd pattern and dribbling)... but they were repaired and cleaned. Any idea if this would fix my smoking problem?

Since the timing chain looks good, I have pretty much narrowed down the issue to the IP on the #4 cylinder. I am guessing the number 4 squirter on the IP is at fault because #4 cylinder does not heat up as quick as the rest and does not "hit" like the other 3 cylinders. As far as I can tell, #4 isnt firing correctly and is belching the bits of fuel it gets out the tail pipe. Any other ideas/comments before I go back at this tommorow?