MOT Emissions Failed :(

[ChrisUK20]

Hi everyone

I took my car in for the mot and it failed on the emissions Lambda

The readings are:



The car is a Toyota Glanza V 1996.

The MOT tester said it could be a leak around the exhaust so I am going to check this if its not that has anyone else got any ideas?

Also I seen you can do terraclean do you think this would help the lambda readings?

Thanks

[emperorburger]

Stick a bottle of jollop in the fuel tank and run it through again

https://www.eurocarparts.com/p/stp-stp-emissions-r...

[MonsterUK20]

emperorburger said:

Stick a bottle of jollop in the fuel tank and run it through again

https://www.eurocarparts.com/p/stp-stp-emissions-r...

No good I already put a whole bottle of Redex Petrol Emissions Reducer before the MOT.

[snotrag]

Read the paperwork properly - its failed on lambda (air-fuel ratio) being too lean.

Suggest an exhaust leak is likely.

If not - given that its a Glanza, its highly unlikely to be standard. What ECU/Tune is it running?

If it IS running lean, and more importantly running lean at higher rpms/loads than an emissions tests, you've got bigger issues than getting an MOT or not.

[Turbobanana]

Thrash the living daylights out of it on the way to the test centre.

[emperorburger]

Turbobanana said:

Thrash the living daylights out of it on the way to the test centre.

This.

[Old Merc]

MonsterUK20 said:

emperorburger said:

Stick a bottle of jollop in the fuel tank and run it through again

https://www.eurocarparts.com/p/stp-stp-emissions-r...

No good I already put a whole bottle of Redex Petrol Emissions Reducer before the MOT.

Did you also give it a foot to the floor 5000rpm road test ?

[snotrag]

Given this:

snotrag said:

If it IS running lean, and more importantly running lean at higher rpms/loads than an emissions tests, you've got bigger issues than getting an MOT or not.

I would strongly suggest that:

Turbobanana said:

Thrash the living daylights out of it on the way to the test centre.

Might not be the best course of action unless without further investigation.

[MonsterUK20]

I was thinking exhaust leak or some sort of air leak I will check it out.

Do you think a Terraclean would help the emissions in anyway if everything seems to be fine?

[Megaflow]

snotrag said:

Read the paperwork properly - its failed on lambda (air-fuel ratio) being too lean.

Suggest an exhaust leak is likely.

If not - given that its a Glanza, its highly unlikely to be standard. What ECU/Tune is it running?

If it IS running lean, and more importantly running lean at higher rpms/loads than an emissions tests, you've got bigger issues than getting an MOT or not.

Yep. Reading on my phone, I saw the readings, CO & HC pretty good but lambda way off, before I could see the rest of the post and my first thought was exhaust leak.

[V88Dicky]

As already stated, check the exhaust. If necessary, take it off and make sure there's plenty of exhaust paste applied to all the flanges / joints, then refit nice and tight.

[Baldchap]

A beer can and jubilee clips make a wonderful semi-permanent repair for a blowing pipe if it's on a straight section.

[spikeyhead]

Just fix the leak, but do it properly.

Baldchap said:

A beer can and jubilee clips make a wonderful semi-permanent repair for a blowing pipe if it's on a straight section.

1988, somewhere in France, a tin of peas with both ends and the contents removed, and some steel wire kept the exhaust together for a couple of days until civilisation could be reached. It's a fine approach in an emergency, but semi-permanent?

[LimSlip]

emperorburger said:

Stick a bottle of jollop in the fuel tank and run it through again

https://www.eurocarparts.com/p/stp-stp-emissions-r...

Not this

emperorburger said:

Turbobanana said:

Thrash the living daylights out of it on the way to the test centre.

This.

Not this either

As the more enlightened members have said the Lambda value indicates an excess of oxygen in the exhaust, which is most commonly caused by an exhaust leak. Bottles of snake oil and Italian tune-ups are to help coax tired old catalytic converters into life, the converter is working perfectly well in this case.

[chammyman]

No bottle of goo will help, it won't have any leaks. It would be a massive leak to get it there.

I assume your not pals with them or they would have stuffed a rag into the tailpipe and it would mave passed.

Its either not going far enough into the pipe or its to large and drawing fresh air into the sample probe.

I'm a tester and see it all the time.

[NMNeil]

Start by checking for vacuum leaks.