jap-sti-555

hi guys, failed emissions today but not really suprised. had the car imported last year and has been decatted. is fitting a cat the only way i have to get it thro or is there any other things i can do to maybe get it thro.
thanks all in advance!

p.dicko

what year car is it ?
if its a pre 95 model shouldnt need a cat test because its an import and the emissions test should be a non cat test because the data in the machine cant find an exact match for the vehicle

andythejock01wrx

My car just passed the MOT today with just one cat, although it was a Ninja downpipe with sportscat, which cost me £300.

caperbility

I got the same problem mate,got a 1995 sti with full decat exhaust. Took that off for mot,put the original back on including cats and the bloody thing still failed on emmissions!!!!! got to take it back monday after getting it well hot with a run on the motorway first but any advice would be greatly appreciated here as well

jaytc2003

iTrader: (1)

find a friendly station, they do still exist. Otherwise do a service, plugs filters (inc fuel) to see if that helps

Stockie12

My uk97 passed the MOT easily with just the centre section cat. Easy to fit as a temp measure!

caperbility

Mines failed having all the cats on and being recently serviced as well. whats all that about then lol. Guess my garage isnt very friendly anymore

Alan Jeffery

Figures need to be below .30 CO, 200 PPM HC and lambda .97 to 1.03 for most cars.

If you have correct lambda and around .5 to .6 CO the cat is duff or missing!

If you have low lambda ( below .97 ) and a high CO the car is running rich, and you have a fault.

caperbility

On fast idle my co2 was.511 second fast idle.505 Lambda was 1.007 and1.002 on natural idle test co was .808 whats the verdict then my friend??

caperbility

And more to the point how much will a new cat or sensor cost me?

p.dicko

mines passed every year for the past 4 mots, straight thru emissions no probs also my mates decatted starlet turbo my95 passed aswell,talk to your tester ask him what emissions test he is doing and get him to show you the testers manual its in there about import requirements.

Alan Jeffery

Hi Caper.. Cat should fix that. As your lambda is correct, the mixture isn't the issue.

rigga

iTrader: (4)

Had mine done a couple of weeks back,borrowed a uk center cat off one of the guys off here local to me,never knew him before i asked for one so thumbs up to the scooby community ,took the apexi ecu off and refitted the original,trundled up to the test center,passed with flying colours and half an hour later back to decat and proper managment and a happy bunny for another 12 months

caperbility

Excuse my ignorance but does it sound as though my cat is donald ducked then? Im sure there is 2 on my system from what i can remember so how do i know whick 1 is Knacked.? And more to the point what sort of money are we looking at?