emissions high

taxi_ken

hi, my 2001 vec sri 150 has just failed its test on the emissions. failed on the co the limit is 0.30 mine was 0.41 tried a fuel aditive still the same, did a service still the same. put a new cat on and they were through the roof on co, lamba & hydrocarbens.
we have now put the old cat back on minus the pre cat and put it on live data the lambas are now doing there job and the car runs alot smoother as it ran like a pile of shit with the new cat fitted.
has anyone had this problem?
running back to my mates in the morning to check the emissions AGAIN! just hope its sorted.

JohnnyN

Did you check the data after running the car gently for a distance with the new cat fitted? I remember reading that you have to run a cat for a while upto temp to get the correct readings? As there is no precat the main cat has to do more work to get the emissions down.

Failing that, maybe a faulty front lambda sensor?

taxi_ken

yea mate had the new 1 on all weekend and it was warmed up before it was checked today. the readings were off the map and it was smoking like you wouldnt beleave. cant understand it try again tommorow with the old 1 on and the pre cat removed lambas are working properly on that and no smoke.