Catalytic Converter.
Discussion
The search function is not working at the moment but I need urgent advise on catalytic converters. I have a 94 4.3 chim thats just failed the MOT due to high CO2 emissions. I'm checking out the lambada sensors but where are the cats situated? If I have to replace them, how much do they cost? Where can I get them from? How easy are they to fit? The cars running better than ever, seems to run better without an MOT, so why do we bother? Any advice much appreciated.
Are you sure that it failed due to high CO2 Carbon Dioxide, high CO2 usually means that combustion has been efficient. I would think that if it failed emissions it would be due to high CO Carbon Monoxide a poisonous gas. But I'm not up on current Euro standards. If it was indeed a CO failure it could be caused by something as simple as a clogged air cleaner or the oil not being changed for a while. Wish I could help with the Catalytic location but we don't see to many Chims around here, being a 1994 model I would assume there is only one, behind the crossover pipe for each exhaust pipe (Dual exhaust) anyway catalytics rarely are the problem these days mine has 208,000 miles on it and it still passes emissions in the states, with it's original Cat.
The main cat is in the Y piece at the front of the engine, I think it would cost £500-£600 to replace so hope that isn't the problem. You should also have a small pre-cat inside the 4:1 collector on each side of the engine, you don't need these to get through an MOT and if dead you can simply throw them away.
spend said:
Get it good & hot immediately before the emissions test (particularly if the pre-cats have been removed), old cats just seem to need more heat - and may then pass.
Good advice
My old man drives an Alpina B3, but not very often, he took it for an MOT and it failed on emmissons, the MOT garage wanted to fit new cats, etc, he called the main dealer they said to take it for a good long hard drive before the retest and although the garage weren't happy to do the retest knowing no new parts had been fitted, surprise surprise it passed with perfect readouts.
I installed a new main cat last year as the old one had been blocked by the the precats which had disintegrated. I got a new sports freeflow cat c/w adaptors (as the diameters were slightly different) from Blackthorn Autocatylists Ltd at a cost of £187.00 plus vat. I did all the work myself which only took 4 hours. If you can't TIG weld, simply take out the Y piece and take it to any stainless steel fabricators with the new cat and get them to weld it in.
BTW I didnt bother changing the pre cats.
BTW I didnt bother changing the pre cats.
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