This is the vacuum line I replaced

Hello all, I have a 1997 850 T5 sedan with an IPD reverse intercooler kit and cold air intake (this kit was on the car when I got it). I just replaced my PCV valve and upper engine mount bracket, after the job was completed I had trouble getting the car to start, that was quickly solved be moving the bracket that holds the PCV hard pipe from in-between the intake manifold and the block to on top of the intake manifold. Since then the car starts and drives, however I now have a check engine light that says the system is running too lean (bank 1) and I have absolutely no boost.

PARTS REPLACED:
as I mentioned previously I replaced my PCV system and upper engine mount bracket, as well as replace some vacuum lines and ended up replacing cam position sensor. The lower right bolt for the engine mount bracket was a pain to get to and I'm worried I may have messed up a vacuum line or something trying to get it out as it is a tight fit. The vacuum line I replaced is the one that connects onto what I think is the turbo and snakes around to the lower nipple on the intake manifold. The hose I got was a Little thicker then the previous one but the inner diameter appears the same. With some trouble I was able to get a hose clamp around it and tighten down to where it won't move. The other hoses around there seem for the most part fine so I left them, however the hose from the waste gate to the turbo control valve seems a little brittle.

THE ISSUE:
once I finally got the car running again, all seemed well until I realized I have no boost. I was suspecting that the intercooler piping that goes to the throttle body might be the culprit, my question is if there is a leak on one of the connections of the intercooler piping, could that cause no boost and an engine code to read too lean?

I previously had an issue before I changed my PCV valve where I would loose boost when I floored it while trying to pass someone, and I fixed that by tightening the clamp on the silicone hose that fits on the intercooler. The strange thing is that I would still get a good amount of boost and no engine code.

I apologize for the long read, I am somewhat new to working on cars and this is my first boosted brick. Any help or advice is greatly appreciated, thank you.

 

Did you check the vacuum hose on the end of the intake manifold on the passenger side?

 

Yes, it was plugged in.

I forgot to mention that I had to replace the cam position sensor because the plastic casing around the plug fell apart in the connector, so we replaced the connector and rewired it in the same orientation we took it off

 

Extreme yes. In fact, it's more or less the only thing that causes both those conditions.

 

That line that you replaced goes to a pressure relief valve that dumps boosted air back into the intake side of the compressor. It doesn't look at compressor discharge pressure, it looks at manifold pressure using that line.

In general, if you lose boost control and you lose in particular various rubber lines used to control boost, you'll have too much boost. That's the general rule. The opposite scenario, you can get limited to about 5 psi if your rubber lines to the boost control valve are all intact and the valve stays in the "limit boost" position all the time. The lines have to be intact in that situation.