NCT emissions fail

Redriddick

Hi guys,
I have a 94 mr2 that failed the emissions test, I have attached the results below. Will the dipetane dose work to get me over the line??

ongarite

Don’t think so.
Both low and high idle CO2 failing and your lambda looks good.
Good chance your CAT needs replacing.

Miscreant

Redriddick wrote: »

Hi guys,
I have a 94 mr2 that failed the emissions test, I have attached the results below. Will the dipetane dose work to get me over the line??

I had a Suzuki Cappuccino of that vintage that used to fail emissions with similar figures. Fresh fuel, Dipetane and putting a couple of hundred miles on the car actually did the trick for me so it'll be worth a shot I think.
The issue with my car was lack of use. Any year where I used the car for a few weeks before the test, it passed.

barneygumble99

Miscreant wrote: »

I had a Suzuki Cappuccino of that vintage that used to fail emissions with similar figures. Fresh fuel, Dipetane and putting a couple of hundred miles on the car actually did the trick for me so it'll be worth a shot I think.
The issue with my car was lack of use. Any year where I used the car for a few weeks before the test, it passed.

It was the fresh fuel and the driving that did the trick. Dipetane is absolute snake oil.

Redriddick

I wouldnt say the car did much mileage before I bought it and its not gonna be my daily driver. I have a retest at the end of the month and want to put it through to see how much work I need to do over the winter etc.

antodeco

Drive it for a good while before the test. High revs and drive it like an MR2 should, and it should pass. I used to have to put 4 cars through the NCT each year, but all but 1 are now over the 40 years old mark!

TheW1zard

Redriddick wrote: »

I wouldnt say the car did much mileage before I bought it and its not gonna be my daily driver. I have a retest at the end of the month and want to put it through to see how much work I need to do over the winter etc.

Just needs a good rip!

Pkiernan

Dipetane and Midleton whisky mixed 2 to 1.


Then, when that doesnt work, just get your car fixed so its not a gross polluter.

Redriddick

Ok so tear the arse out of it prior to the test, amni wating my time with an octane booster??

Redriddick

Pkiernan wrote: »

Dipetane and Midleton whisky mixed 2 to 1.


Then, when that doesnt work, just get your car fixed so its not a gross polluter.

I'd rather drink the whiskey.....

Pkiernan

Redriddick wrote: »

Ok so tear the arse out of it prior to the test, amni wating my time with an octane booster??

Why not get it fixed?

Redriddick

Pkiernan wrote: »

Why not get it fixed?

Well as I said it has not been driven much, there is a new lambda sensor fitted and the cat looks like it's been replaced.
It has done less than 5000 kilometres since February 2018.

antodeco

Pkiernan wrote: »

Why not get it fixed?

If it doesn't get driven much, no matter how much work you do on it won't really affect it. The build up of carbon in the exhaust from the engine not getting hot enough increases likelihood of a higher read (as more carbon is being released, but not actually "more" carbon).

Think of it like this. You go running once a month. You'll be stiff and sore the next day. Run every week, not as bad but still have stiffness and soreness. Run every day, most of that will be gone.

Redriddick

antodeco wrote: »

If it doesn't get driven much, no matter how much work you do on it won't really affect it. The build up of carbon in the exhaust from the engine not getting hot enough increases likelihood of a higher read (as more carbon is being released, but not actually "more" carbon).

Think of it like this. You go running once a month. You'll be stiff and sore the next day. Run every week, not as bad but still have stiffness and soreness. Run every day, most of that will be gone.

Am I right in thinking my emissions didn't fail by much?
Going to go in and put some miles plus petrol in it after awhile.

Mad_Mike

Your lambda is bang on and that tells you that at low and high revs, the air/fuel ratio is perfect, with no rich firing or lean firing
High HC figures with a good lambda would tend to point to the catalytic converter as the cat is not burning off the hydrocarbons fully
Likewise, CO is an indication of incomplete combustion, so again, going on the fact your air to fuel mix is correct, it also points to the cat not burning off the exhaust fumes fully

Redriddick

Mad_Mike wrote: »

Your lambda is bang on and that tells you that at low and high revs, the air/fuel ratio is perfect, with no rich firing or lean firing
High HC figures with a good lambda would tend to point to the catalytic converter as the cat is not burning off the hydrocarbons fully
Likewise, CO is an indication of incomplete combustion, so again, going on the fact your air to fuel mix is correct, it also points to the cat not burning off the exhaust fumes fully

Thanks a million for the response, Italian tune up should sort it so!!!!

Redriddick

Ok, so I'm just back from the nct. Low idle co is 0.49% so that's a pass just. High idle is 0.47 so that's a fail as it needs to be 0.30% or below. It needs two front ball joints too but that's easy.
I put half a tank of miles plus petrol and some dipetane in it but I dont drive this car and there is still over quarter of a tank of petrol in it. I had a look at the exhaust, cat atc last week and it all looks new. I think I still need to drive it like I stole it for it to pass the emissions. The car isn't going to be used at all from now until next spring as I am going to give it a complete overhaul suspension, timing belt etc. The question is should I do the balls joints, dive the ****e out of it and put it through again???

zilog_jones

Personally I'd be concerned about pushing it hard if I didn't know the condition of the timing belt, especially if it's overdue (mileage or age).

Redriddick

zilog_jones wrote: »

Personally I'd be concerned about pushing it hard if I didn't know the condition of the timing belt, especially if it's overdue (mileage or age).

It's a non interference engine, so if the belt brakes it wont do any damage.

mikeecho

You could try using a fuel additive high in polyetheramine, such as bg44k or archoil 6400p

polyetheramine is the active ingredient in petrol for carbon deposit removal, it's what techron basically is.

No connection, but www.powerenhancer.co.uk sell that stuff and have a current promo code of POWER20 for 20% off.

I've used parcel motel and address pal to reduce shipping costs.

ShedTower

As has been said give it a good going before you get to the test centre.

When the NCT fella was checking me in and asked for my keys I said I'll hold on to them as I want to keep it revved. He smiled and said grand. I kept it hot and he was out about fifteen minutes later. He knew the craic so he gave it plenty of revs before driving in. It passed anyway.