MOT failure on emissions

[patman]

Just wondering if anyone could please give me some tips please here,

I had the "exhaust emissions lambda reading 7.3.d.3" today on the mot sheet yes I am pretty pissed at th moment as my car since I had it as always passed it's not.

Ok on "after second fast idle it ended up being 1.12 and I know the limit is 1.03, so now I need to figure out how to get this down, my GT is a 1993 with decat on, lambda sensor is only just over a year old, on the back box hanger there is a crack with black soot around it, (would that course it to be much higher than 1.03?) I told him it was an import so it didn't need a cat being a 1993, just trying to shred some light on this please guys, and if any of you have had higher emission readings before how did you get them down please as need to get car back and retested.

Thanks Pat

[5e colin]

the split in the exhaust tube will couse high lambda reading or any leak in the exhaust as a matter of fact

try fitting oem cat ??

[akyakapotter]

Wrong emissions test they have done a UK test.

[Gainzy]

I thought anything under a 95 reg is exempt...

[patman]

Thanks guys, Colin mate I am getting that sorted within the next few days as to be fair there is a nice crack there with black soot around it, also I haven't got a cat either,

Gainzy mate this is what I thought aswell being a 93 import but when I go back I need to get these facts right and say you did hear me last time say it was a import also I noticed when they held the throttle on for 3 minutes is it, they done it to 3k revs

Edited December 12, 2016 by patman

[patman]

Found this on line just wondering if anyone can confirm it bearing in mind mine is a 1993 import, and the emissions is the question here, all other checks when they put the pole in the exhaust pasted.

Also my car is not on the annex list.

Edited December 13, 2016 by patman

[akyakapotter]

They need to test it to the spec of my 1st post bud. They have tested it wrong. I had that trouble last year phoned dvsa them self and they confermed it was wrong and should have a basic cat test ie more room for movemet with emissions. Go back to the garage with my picture and show the tester that or even better get them to look it up in there book or computer. tester should no this anyway as its an import,

cheers nick

[daniel_g]

This is the more up to date version, straight from the MOT book at work.

Show them this, straight from the MOT book.

[patman]

Thankyou for helping guys really appericate this do I actually need a lambda test? I'm on my phone Daniel so can't really see them results, and

On potters one it seems like I don't even need a cat test done, I just need to give him a positive response and say there you go, obviously there is a crack that needs sorting on my back box area which I know will make it go higher but that will be sorted for the part retest on Monday

Edited December 13, 2016 by patman

[daniel_g]

Should be carry out a BET test, it wont meet the min limits.

Then its goes down to if its between 92 - 95, they wont be able to find an exact match.

So it gets a non CAT test which is has very lenient min values of CO = 3.5% and HC 1200ppm.

I've been getting pestered to sit my MOT test for a few years now but i refuse because its far too much hassle haha.

[patman]

Thankyou Daniel mate appericate this, I need to see his mot book for myself he went into a room and didn't return for 15 mins after so god knows what his looking at in there, when I go back I will ask did he do a non cat test last time, but then obviously seems like he didn't due to the results at the end thanks mate

[roachburger]

pre 92 is non-cat test, even then i put mine through on idle.

it's not the testers fault, you get a series of yes and no questions about the age of the vehicle when doing the test. It's something like:

what is the age of the vehicle?

1. after 2008

2. 1992-2008

3 < 92

4 < 76 or something

so he's just said between 1992 and 2008, therefore has applied a cat test unknown to him.

not many mechanics know about the import laws side of it, in all honesty, i didn't until i bought a Jap car so most will just stick to the pre 92 rule.

The general consensus for us is, if you get to doing a BET test its failed.

weld up the blow and make sure its warm when you hand it to the tester and morning is better because any overfuelling will be mixed with the water vapour in your exhaust.

orr if you have the ability (apexi) set a low rev limiter. i did that to toyota when i first took mine for m.o.t they refused me a test hahaha

Edited January 1, 2017 by roachburger

[patman]

Thanks for the write up roach much appericated, little update, after we welded up the blow bit where it was cracked it went back to the mot and they still failed it on lambda emissions, as everyone knows you need to get between 97 and 103, I got 104 dam it, originally it was on 1.12 before the weld and then once that crack was done went to 104,

Anyway thought sod this and just put a universal sports cat on (welded in) back to the mot and straight through it went, co levels were very low, hc levels very low, and no problem with the lambda one,

although it's a sports cat I'm still thinking the car has now been restricted alittle bit