Scooby David

iTrader: (3)

Hi all

Sorry for all of the numerous threads about my car failing its MOT on emissions! I changed the Lambda as originally thought and took it back today but it failed again, this leads me to think it may be the CAT at fault. The car has had a few bits messed around on it, and the exhaust looks no different (brackets not done up etc), so i am wondering if what i think is the CAT may not be a CAT at all and in fact the car could be de-catted completely. Can anyone tell me from the pics below if the CAT type boxes are so or just resonators on an aftermarket pipe.

Regards

David

N_Scooby

iTrader: (2)

Just a resonator. JDM classic never had a cat there anyway. They only had the cat in the down pipe.

Shaks-STI

iTrader: (7)

both of my classics V3/V4 sti have downpipe cat and centre section cat too. and from does pics looks like you have full decat exhaust

DantheMan2605

My god that underneath looks clean! Puts mine to shame

SLAB

iTrader: (77)

M8 find someone who will do it for a little extra your pissing in the wind with theses garages that wont pass because its a little out, some might say ooooooo what if the cars not safe, well it is as you have had a proper test, just *** heads wont pass it they don't even have to do the imissions test if they didn't want to, i had the same problem with kwick ****, were are you at m8

Mr moff

iTrader: (1)

If it's a 95 I'd go to another mot station.
My old Evo was made in April 95 and failed it's first mot on emissions.The co was 2.2 and I spent a small fortune trying to get it down.
I went on the lancer register to ask for advise and was told the mot place were doing it wrong.
I contacted vosa just to be sure and they guided me to a flowchart on their site for me to print out and take to the mot place showing where they were doing it wrong and the mot bloke asked me to leave.
I took it to another mot garage and it passed straight away.The guy there said I should take them to court for all the money I spent trying to get the co down as it needs to be under 3.5 co if it was made between 93 and 95.
I made a complaint through vosa and never went back there again.


Danny.

Scoobyno1

iTrader: (22)

If only he had taken pics of the sills?

Scooby David

iTrader: (3)

My car is a 95, but Uk so it should have a CAT as standard. The guy is doing it right as it is on the emissions register so has preset guide in the machine, or so i am led to believe and going by the report i got it was well out to the limits the car is aloud!

I would take it to a Scooby friendly garage but i have already paid for the test at this place so wouldnt it be easier to get hold of a cheap second hand CAT?

ukimpreza

iTrader: (9)

sometimes the size of tail pipe creates false readings the mot station blocked the bottom half of mine last time with rags to get it through.

Mr moff

iTrader: (1)

Ah sorry mate I thought it was an import,so there is a match on the vosa system.
Any ideas about it's last mot pass?have you done any mods since then?


Danny.

Scooby David

iTrader: (3)

It didn't have any emissions problems. I bought it off of a girl cheap that was working on it, she must have de-catted it after the last test which is why it may be struggling now, its become a right PITA to be honest. None of the work has been done by me so I don't know too much about the history of it.

Alan Jeffery

Hi David

Please let me have the fail figures.
You should have;
CO .30% max
HC 200 ppm max
Lambda .97 to 1.03

From your figures I can tell you if the cat is the issue or not.

Scooby David

iTrader: (3)

Hi

These are the results:

Fast Idle Test: CO Level - 2.96%, HC Level - 68ppm and Lambda 0.93.
Second Fast Idle Test: Co Level - 2.73%, HC Level - 70ppm and Lambda 0.93.

It says it passed the natural idle test.

Since these readings i have replaced the Lambda as i thought that was the problem.

Thanks for your help.

David

DT-SPD

iTrader: (7)

Have you got the readings with the new lambda sensor ?

Scooby David

iTrader: (3)

Unfortunately not, the garage that done my MOT checked it FOC and didnt count it as my retest.

scoobygreg

iTrader: (3)

pity you wernt closer ive got a cat of a my00 uk classic in my shed


shame the guy doing the test couldnt tell ya you didnt have a cat in the first place

Scooby David

iTrader: (3)

Been a right nightmare mate, spent money out on a Lambda that prob didnt need replacing!

I have bought a CAT which is due to arrive tomorrow morning so fingers crossed one i have put that back on it will all be ok!

It would be handy though going by my readings if someone could clarify if its likely to be a CAT problem.

DT-SPD

iTrader: (7)

lambda reading 0.93 is a bit low and will cause the cat to not work correctly. readings with the new lambda would be ideal. also check for any intake for any intake or exhaust leaks as these will change lambda and cause cat to run badly.

Alan Jeffery

If your first lambda reading was .93, that's rich, backed up by the CO level. In which case you may well have needed a lambda sensor.
To sort out what's going on now, you need to find out what it's failing on now. Ask the man for the figures!

Scoobyno1

iTrader: (22)

Don't forget Dave to give it a good Italian tune beforehand to make sure its nice and hot.

Galifrey

iTrader: (3)

Indeed, and that rich with only 68ppm HC, you must have a cat there, (HC is unburned fuel which is lowered by a working cat) that is just massively overfueling.