Nct Failed 3 times on emissions.

Ronan97

Hey Boards,

I recently did my thirds attempt at NCT today trying to pass my 1.2 Vw Polo 2006.
I failed first time and emissions were at

Low Idle
Co 0.44% Vol
HC 29pmm

High idle
Lambda: 0.99
Co 0.52 vol%
HC 15 pmm

I then went into car parts accessories and they advised i tried petrol engine cleaner.
Low idle
Co 0.63 vol%
HC 35 ppm

High idle
Lambda 0.99
Co 0.55%
HC 15ppm

After reading loads online about people flying through nct with dipetain i tried using that driving to NCT in high revs
Low Idle
CO 0.88%
HC 39 ppm

High Idle
Lambda 1.00
Co 0.51%
HC 22pm

I dont know what to do at this stage can someone please point me in the right direction as do i need a new catylic converter ?

Waterson

It is possible the cat has failed, but the reason it has would need to be identified first.
How much oil does the engine burn between services?
How does the car perform? Does it misfire, or do you experience any power loss?
Any smoke from the exhaust?
Have you checked the fuel trim figures on the car, i.e. is a running fault causing an overly rich fuel/air mix?

LordSutch

DIPETANE

You're not adding enough.

Dial Hard

LordSutch wrote:

DIPETANE

Not much use in the OP's petrol car...

biko

Dipetane can be used in both but I'd say to have a mech look at it. A mech that has an emissions tester.
There is one I know in Galway if you're close by OP.

Special Circumstances

Dial Hard wrote: »

Not much use in the OP's petrol car...

Why not?

aosaigh

Mine failed on emissions. The oxygen sensor needed replacing. Was expensive enough (~€200).

Water John

Boot the arse off the car on the way to the NCT. Drive in third gear at high revs and have it hot when you get there.

Ronan97

Thanks for all the replys. Drove the bollocks off it all the way to nct and atill no avail figures went up.... cant afford to fail it again. Should i bring it into calbro galway and let them away eith it ??

nd

Just wondering what's the air filter like and when was it last serviced?

dieselbug

Bring it to capable garage and have a proper diagnostic done, you have already wasted enough of your time and money.

First suspect would be the cat but other things need to be looked at and ruled out first, anything else is just guessing and that costs.

Stoolbend

Get a compression test done first. These engines are prone to valves burning and reducing the compression meaning the fuel mixture won't burn fully.

It could also be the cat. But get a compression test done first.