abyss113 said:
You do remeber I bought a brand new cat for it
If the cat is new, (ie less than a year old) then it prob not a cat issue, one thing to be aware of, is a non approved CAT converter (i.e cheaper replacement, less good minerals inside) can fail well within a few months, i have seen myself change a CAt converter 1 year, then 11 months later it still fails next MOT......
If we are sure the cat is relativly new, under 1 year, then we need to be thinking, that a internal engine seal is gone, and oil has contaminated the exhaust sytem, which if true would warrent a new cat (as cat fitted will be contaminated) due to Very High HC readings (unburnt oil).
From my years running a gargae and dealing with MOT failures, i can positivly say emmisions are the black arts, of motor repairs....although the most expensice repair is genarraly cat replacement, it solves the issue 9 times out of 10. \if it is an interal oil seal, though you could be looking at replacing cat every year....just to get reading down at time of test...
Other option would be drop another engine in with, existing cat atc and re do a full MOT......which may be a cheaper option, excluding time ....if that then fails for same reason, then we basically confirm the cat, as faulty...as it would be unliky 2 engines both have internal oil leaks.
