Ok,
So I went on holiday to Europe for 5 weeks and other stuff happened.
So where was I...oh yes car started and ran well, but there was a coolant leak somewhere, and it looked to be coming from the valley pan area. Under the manifold at least.
Weeks alter I bought a Uro valley pan with membrane attached. 2 weeks later I cleaned it up o-ringed everything and tightened it down...yippee
2 Weeks later its leaking, from what looks like the same area. I borrowed a pressure tester from work. Flash alright, it showed me what I already knew. It was leaking at the valley pan gasket. 2 weeks later I pull it apart. The membrane is split in two going all around. It's mustard. I clean up the original, with some 60 grit sandpaper or whatever was closest to me and did some good ole fashion googling.
After a time I buy some permetex 'the right stuff', it is supposed to be pretty good in areas like this, i.e. crap areas that like to leak all the time.
So I clean it up, clean all the bolts on a wire machine thing, Loctite them nicely, I even bought a nice 1/4" torque wrench. I noticed one of the bolts wouldn't go in straight so got a shorter one and that was better. It must have been one of the three that I had to drill out that must have had some dregs left.
As you can imagine I have m6 and m8 bolts of many sizes due to the swap over, so I used a shorter one. I used the permetex on the valley pan, nice and square, torqued to spec and prayed to god, using many swear words as possible.
Apparently it works straight away, the skeptic in me won me over and I left it overnight then some. No need to re-torque apparently.
I put it altogether and...
well it ran, and it didn't leak, but the idle kept hunting like a real mongrel. I swapped some stuff over...
There was a coil soaked in oil and was running on 7, so swapped that out. No leaks anywhere... I used crc, and it is still hunting and going up and down sporadically it was here when I went googling and I thought, I am stuffed without a diagnostic thing (whatever they are called), and I cant be bothered swapping everything over, only to find it is something I cant find..
I swapped in the old (cant remember which one actually, but the other one), the other TPS and coil looking thing. It ran, it stopped hunting, I also changed a temp sensor from the rear accumulator, could have been any one of them, but I don't care. It runs like a dream, before today, it never ran under 750rpm. Now its between 650-700 and its the best it's ever run.
So the swap is complete, well complete and running like it should. I have parts for Africa, and I hope I never have to use them, but it's fair to say, they are there when I will need them.
Going to throw the 3l to the recycle guys.
The clutch feels different, better? Don't know but it can handle the power for now, it should be run-in by now, and I have taken it for a good blast.
Best ever mod for a 530i 5 speed by miles.
Next on my list is to go to 17" alloys as my 18x8.5 Hamanns are probably a tad too big for the HD billies and stiffer springs and spherical this and that. Then there is the glovebox to fix...