Hi guys im still failing emissions even with cats on my classic?

Its failing the CO limit is 0.300% mine did a 2.456% Matt the bloke i borrowed the exhaust off said his passed around a year ago with it on, so any sudjestions guys? Maybe i could try another catted exhaust first?

Thanks guys
Daz

 

Cat's may have broken down... loads on here have catted parts about what paticular bits will you need ?

 

The one thats on there right now is the whole exhaust from Matt, so i guess i need to borrow all of it, really urgent now cause there is no MOT on there right now

Thanks guys
Daz

 

I had a similar problem with my RA and a local MOT garage told me to take the car for a short drive and not to go above 3rd gear at about 4 to 5k rpm for about 5 mins to get the exhaust really hot.

I then took it back in and got it tested straight away and it passed.

 

It was well warmed to brecon and it was tested straight away and look how much it failed by

 

Hmm, something wrong there then.

Faulty O2 sensor in downpipe possibly, thus giving false readings to the ECu making it abit of a rich mixture.

 

So the 02 sensor isnt the lamba sensor?

 

Bung the guy £20 to turn a blind eye ?

On a sensible note, I had the same problem. It turned out to be a faulty sensor.

 

Its the same thing, sorry.

Halfords use to sell these for about £15, I think it was the Bosch L300 O2 sensor.

 

Yes mate brand new Lamba was fitted before the test

 

If someone local could lend me some cats then i can retest it and if it failed again then

 

im matt, lol, i tested the car in for for daz today, and it way off. the exhaust on his car is cuurently mine. which i had no issues with, but it may av broke down on my car but i havent re tested with it so dont know.

i fitted a new lambda sensor onto daz car but that made no diff.
iv checked for power to the sensor and thats all fine.
so conclusion is from print outs from machine cats r knackered.

on the 96 impreza, how many lamda sensors where there, one or 2, and the exhaust i fitted on to daz car was from a 98. i cant see that being a issue unless the early cars had 2 sensors?

looking if possible to borrow a exhaust to fit, and re test emissions. trying to troubleshoot best possible for daz before it starts costing money if the problem isnt cats.

 

Both the early and late classic have 1 Lambda sensor and 1 "Cat on fire" sensor. The only difference being the early car had the lambda sensor positioned in the headers and the later car having the sensor positioned in the downpipe.
If the car is running a standard map, fitting an after market VTA dump valve has been known to make the car run rich, but this will only be while on throttle.

 

hi guys
i got a full system off my 94 wrx you can borrow if you want but you'll have to pick it up from my house (not going to merthyr this time )

 

hey ozz, il meet u in brecon for it 2moz, any good.

 

yer m8 no probs

 

If it passes with your exhaust ozz then i owe you big time! And im not gonna take no for an answer this time

 

no probs m8 fingers crossed

 

Hope you get it sorted, had same problem last month

 

After some reading through old posts on here, a guy said that 95 and below imports do not require advanced emissions tests only a standard one and dont require a cat either is this true?

 

Found this off another site as well

 

like i said to you this morning lads mine didn't need to go through the emissions test in june hope all goes well

 

Today the CO was at 1.5% so i will be ringing vosa tomorrow and giving the phone to the tester and he should then test it as a non cat car limit which it 3.5% so it will fly through

 

all iv found really is this, daz sed car was registered in november 95, so wud need full cat test. for his sake i hope it doesnt tho.

http://i186.photobucket.com/albums/x.../emissions.jpg



u may need 2 save image and zoom in a bit

 

ah mine is a 94 so perhaps that's why i didn't need it
is that new reading with my exhaust on ?

 

they havent fitted it yet ozz. still my original on there. that system xpains ur mot emissions.

must b a o2 sensor on headers. if a 98 will pass with it, im sure a 95 will providing all sensors are working in in place.

 

ok m8
how is yours coming along?

 

I just had a look and i couldnt see no sensor on headers

 

good luck guys

 

Phoned Vosa up and they say to have non cat emission you need to get proof that your car was built before july 95 and if you dont it needs full cat... ive had a good look through the stuff we got for the car and all i got is the register date which is november

I also phoned the people thats stamped on the log book and they looked in their records and all they have for the car is the chasis number and engine and that the car is green...

Dont know what to do now do i spend out more replacing parts and hope it passes? or how would i get proof that it was built before july 95

Help please!