ECU cuts boost, super high HC emissions and engine hickup at low rpms

Hey, I'm new to this forum and I have been lurking this and rovertech for a while.



Here's my 620ti's history as mine. It's my first car and I went from knowing nothing about cars to being frantic about trying know everything.



Bought it in october 2013, it had 16 previous owners.



dealer I bought it from for £1200 changed brake discs and pads (they didn't know about the captive rotors, haha) before I got it



The ABS light was taken out, I put it in and it was perm. lit, the relay box was unplugged, plugged it in and the abs kicks in every brake, but only on the last 10 meters, horrible to drive in as it hinders my braking.



Clutch failed in January, had it fixed by a mechanic, I suspected the master cylinder as it has some leakage, it was the slave who was leaking a lot.



In March, the starter failed, it was a prestolite one and the castiron cap and split and I was lucky to get the cap out of the bellhouse, switched the faulty starter for a rover original which intermittedly does not engage and spins freely, not critical, just annoying.



Now, last week, had the swedish equivalent of MOT testing and failed.



Bad lambda(oxygen)

Bad HC 1200-1300 ppm(!) max is 100ppm for pass

Bad Carbons

The MOT tester said the car runs as good as a 50's car with a borked carburettor.



Changed spark plugs, which helped a bit.



My speculations are, and remember, I'm new with cars and only go by what I've read:



The car is running rich

The car is running lean

Vacuum leak



Also, when I run the car in second gear, at 5000 rpms, the ECU cuts the engine, I've read that it cuts if boost is over 1.2bar or 14 psi or something? Could a previous owner have upped the boost, seeing as some owner have had a cone filter fitted...



Sorry for the long post and I hope this thread can be helpful for someone else if I get reponses. :)

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