Just rebuilt (complete head work), driven about 2000km and has worked fine until now, feels a little slow (not close to 163hp) and has always done since I got it, but never had time to look it up, until now, before this it never gave me CEL.

But a couple of weeks ago I got code 17536 (P0171 in Generic OBD), cleared and since then no CEL.

So I logged all the things I could with Autodata today and Lambda sensors seems fine, both show 0.1-0.8v.
Had some strange sound from the fuelpump so I took a closer look and found the hard return hose being bent inside tank so fixed that and got a new fuelfilter and sound went away.
Yesterday I was driving home from a trip and CEL turned on almost as soon as I started to drive (yeah always something wrong when your going home from a trip ), got code 17536 again, cleared it and drove about 400km without a problem. Today it felt really laggy and light came on again, its hesitating and feels really slow!

Autodata info gave me:

All air / water temps fine
MAF about 80-90G´s at 5500rpm full throttle 2nd - 3rd gear.
Lambda sensors respond as they should
Turbo pressure about 1550millibar

Tried to pressure test all hoses but I probably did it wrong because I couldnt get the system to keep pressure all the time because I didnt plug anything, it still held pressure pretty good. I guess some of the valves and hoses open up and let air rush into the intake (like the green/black valve that dampens the air).

I´m thinking bad MAF but what more could I check before I go and spend money??

 

Forgot that MAF gave me 1.47g's on idle

 

Also got a: 17699 - Coolant Temp Sensor at Radiator Outlet (G83): Signal too Large P1291 - 001 - Upper Limit Exceeded
that wont go away, tried new sensor without luck..

Did some more testing tonight, VCDS Lite showed MAF G´s to about 120, so MAF should be OK?

But also noticed something scary, my Lambda was 1.14(!) when driving hard 2nd - 3rd gear!

 

Ok Temp sensor fault is gone, PRV and Jet suction pump changed.
I can now hear the "PSHHH" I never had before

But still feels laggy.

Looking around I found that B1-S1 (o2 sensor 1) shows sometimes over -10% on idle and on block 033 it says like 1.540v.

Is that correct, shouldnt voltage be like 0.1-0.8??
I think if the voltage would be so off it would light CEL?

I´ts a Lean problem, because when logging with VCDS lite Lambda hits up to about 1.250 at 3000rpm.

Boost leak test OK, the only thing I can hear now is bubbling in the oilpan as I test for leaks.

 

Now with VCDS log, someone, please?

LOG-01-002-031-032.CSV - Speedy Share - upload your files here

 

Problem found!

Pressure at Rail - 2.5 bar idle / 2.3bar at 2000rpm
Pressure directly from pump - 2.3 bar / idle

So, what aftermarket pumps fit my car?
I tried to measure the pump some week ago and it was about 123-125mm high.