Well she was adequately warmed before a second emissions test this morning, still no joy. Front Lambda replaced, little improvement but not enough. Inspected for exhaust leaks, nothing obvious found.
At this point it was decided to refer to JPP as they were nice an close and a simple MOT was starting to spiral. Saj agreed to take it an get one of his guys to check it out.
1st suggestion was that the missing downpipe cat was causing the issue. I challenged that surely this wud hav affected the previous MOTs as nothing has changed. Also why wud the co2 and HC readings be OK as pointed out above. He agreed this was odd so wud continue without adding the cat back in.
Maf removed and cleaned, idle control valve changed to resolve high idling issue. Further detailed inspection revealed a split in an intake pipe... so now the inlet manifold has to come off, gaskets replaced etc. in order to fix the split. Hopefully this will all be finished off tomorrow an she gets a pass.
Fingers crossed! It's been an expensive MOT so far!
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