Failed NCT test

abakan

Hi all,
Does anybody know a quick fix to pass the emmissions test for the NCT.
The car passed everything else except that and i tried putting the car through a 2nd time, but it failed that again.

I have heard of Dipetane http://www.dipetane.ie/ but dont know anything about that or cost

Anybody any clues
Thanks a mil

John R

which part of the emissions, by how much and what car/engine/fuel?

unkel

What John asked + make sure you drive the car hard just before the test. The cat needs to be red hot to be most efficient

abakan

The car is a renault megane petrol, 98 1.4L.
dont have the sheet with me here but my % was 5% and the threshold was 3.5%. the car before the tests was drove 20miles to the test center

RicardoSmith

Your mechanic should be able to tune it so that it passes the emissions, and if he can't he should be able to tell you why not. We've a '91 fiesta that been borderline the last two times, but always manages to scrape though. Which is a pity because I can't justify changing if it passes.

ibanez

Get a bottle of 104+ its in a green bottle costs about €18 cleans out the cat and injectors.Tip the whole bottle in with half a tank of petrol the morning of your nct.

abakan

ye i went to the mechanic adn he said that he looked at it and done his bit ann said that if it didn pass this time he would have to get a new cable worth €200. so i was looking for ways to lower the emmisions. might look into this http://www.dipetane.ie/.

Ill ask him to tune it in and see what he can do.

greglo23

with emission readings like that it looks like your cat is knackered which would'nt be unusual on a 7 year old megane. if you could post your full emission results i could tell you more.

abakan

i hope your wrong, ill post up the results when i get home in the morning.

RicardoSmith

abakan wrote:

ye i went to the mechanic adn he said that he looked at it and done his bit ann said that if it didn pass this time he would have to get a new cable worth €200. so i was looking for ways to lower the emmisions. might look into this http://www.dipetane.ie/.

Ill ask him to tune it in and see what he can do.

Whats the €200 cable? :eek:

abakan

RicardoSmith wrote:

Whats the €200 cable? :eek:

i have no idea, that what the lad in the garage said,it looked like an electricial cable. didn ask him because he said the car would pass so i didn pay much attention

abakan

RicardoSmith wrote:

Whats the €200 cable? :eek:

i have no idea, that what the lad in the garage said,it looked like an electricial cable. didn ask him because he said the car would pass so i didn pay much attention. ill find out tomorow when i leave the car back in

Gurgle

abakan wrote:

i have no idea, that what the lad in the garage said,it looked like an electricial cable. didn ask him because he said the car would pass so i didn pay much attention. ill find out tomorow when i leave the car back in

With an unleaded burning injection petrol engine with a working CAT its practically impossible to fail on emissions.

Ergo - CAT not working.
Could be the lambda sensor he's talking about for €200
(There's no such thing as an auto-electrical cable worth €200.)

RicardoSmith

Gurgle wrote:

W....
Could be the lambda sensor he's talking about for €200
(There's no such thing as an auto-electrical cable worth €200.)

Thats what I thought.

Theres always a reason for a car to fail the emssions. Its not black magic.

abakan

Exhaust emmisions - .47 vol % should be .3%

engine oil temp - 110c

low idle 720rpm high idle 3130rpm

There is a rough cut of the NCT cert. Turns out the mechanic didn know what he was talking about so im sending the car in for a pre NCT center so they can check it out

greglo23

beware ! most of those pre nct centres are staffed by muppets. the vast majority of them are not qualified mechanics. from those readings it looks like it's your cat all right. it's possible to get a spurious cat fitted at a good exhaust centre for far less than a main dealer.

Shing

I have a 98 Civic 1.4i which failed the NCT for emissions. Some crap about the lambda gauge.

Anyway, I was advised to drive the car hard (as advised by unkel) before going to the test centre. Drove at about 5000 revs, which may be over the top, but I wanted to be sure. Passed the second time with no professional work done to the car.

Regards,
Wai Shing

commited

5000rpm isnt hard - hondas are made to be revved

abakan

greglo23 wrote:

with emission readings like that it looks like your cat is knackered which would'nt be unusual on a 7 year old megane. if you could post your full emission results i could tell you more.

looks like you were right. had to get a new CAT from an 02 clio(€120)
cost me €250 altogether to put it throught the NCT for emissions