Failed NCT smoke test

mcmc

I failed my nct smoke test today:(:(

Nct say its pumping out 3.48 /m and a pass is anything under 3.00/m and excessive smoke.

Any idea on were to start looking at whats at fault?

Car is an Audi A4 1.9 tdi 130, 2002.

Cheers guys

Quazzie

air mass meter or turbo generally. This probably isnt helping much but the only way to know for sure is to get it inspected.

Gypo

Sometimes the car just might need a good hard run before the test - I know my TDI 130 chucks out a good lot of smoke for a few seconds when drove in anger, after a few days pottering around beforehand!:D

thetyreman

mcmc wrote: »

I failed my nct smoke test today:(:(

Nct say its pumping out 3.48 /m and a pass is anything under 3.00/m and excessive smoke.

Any idea on were to start looking at whats at fault?

Car is an Audi A4 1.9 tdi 130, 2002.

Cheers guys

Fill her up with diesel to within a fivers worth,and top it off with 5 petrol and no bother for test...Is that all it failed on??????????

Gypo

thetyreman wrote: »

Fill her up with diesel to within a fivers worth,and top it off with 5 petrol and no bother for test...Is that all it failed on??????????

I would not reccomend doing this with any high pressure modern Diesel, even with only a fivers worth.

mcmc

thetyreman wrote: »

Fill her up with diesel to within a fivers worth,and top it off with 5 petrol and no bother for test...Is that all it failed on??????????

Yep thats all. Dont think i have the balls to try petrol in it.

I was reading about them engine treatments (redex)sp? Half a bottle with a full tank and give it a good hard drive, high revs.

Anybody try that stuff and notice and diffrence?

Thanks for the fast replys too guys.

mick.fr

Seafoam treatment and you will be sorted.
Google that

atlantean

thetyreman wrote: »

Fill her up with diesel to within a fivers worth,and top it off with 5 petrol and no bother for test...Is that all it failed on??????????

I would not recommend that on a 02 VAG diesel :eek:

I would run it for a couple of days with Dipetane added to the diesel - this should reduce the smoke if it is caused by carbon deposits!

Alun

atlantean wrote: »

I would run it for a couple of days with Dipetane added to the diesel - this should reduce the smoke if it is caused by carbon deposits!

That's what I used in mine, and gave it a thorough blast before taking it in to the NCT and it passed with flying colours.

eagerv

My Pug HDI with 160,000 miles failed dismally the smoke test recently. Over 6! I went to local Motor factor and bought a tin of Diesel Engine cleaner and then drove the car flat out for brief periods in second gear regularly over the next week until my retest. This time a pass at .82! Car is driving far smoother now and fuel consumption back to 55 MPG. Apparently a lot of diesel engines fail due to being driven too gently. Hopefully its only something simple as in my case.

snowman707

eagerv wrote: »

My Pug HDI with 160,000 miles failed dismally the smoke test recently. Over 6! I went to local Motor factor and bought a tin of Diesel Engine cleaner and then drove the car flat out for brief periods in second gear regularly over the next week until my retest. This time a pass at .82! Car is driving far smoother now and fuel consumption back to 55 MPG. Apparently a lot of diesel engines fail due to being driven too gently. Hopefully its only something simple as in my case.

My Primera just got though with almost 200K on clock, didnt do any treatment before hand.
was sure it was going to fail on emissions as it was smokey for a while after starting in the mornings.
that was down to 1 of the glow plugs been shot .fitted a new set .

actually I was driving behind a 07 Audi yesterday & was amazed at the smoke emitted on acceleration.

hope you get sorted.

mcmc

Think ill be trying a splash of this Dipetane stuff for two week and get it back in for a retest.

Will keep you informed of results.
Thanks for all the help guys.

mcmc

Like i said i would be using the Dipetane stuff and i have been for about 2 weeks.

Its about 12 euro for a liter of the stuff and i have used about a third of the bottle. Anyway, went for the retest, and it passed. 2.21/m was the result. So i can recommend Dipetane and a bit of hard driving.

Worked for me:D

Thanks guys

draycottgirlz

Dipetane is great stuff alright. Glad to hear

Run_to_da_hills

thetyreman wrote: »

Fill her up with diesel to within a fivers worth,and top it off with 5 petrol and no bother for test...Is that all it failed on??????????

And risk up to 2k's worth of damage to a high pressure common rail fuel pump.
May I suggest the OP change his air, fuel filters and get his injectors serviced.

Bearcat

what a flute putting petrol in a diesel....old wifes tale. Those of you who chip your diesels, this can effect the some test.

mcmc

Run_to_da_hills wrote: »

And risk up to 2k's worth of damage to a high pressure common rail fuel pump.
May I suggest the OP change his air, fuel filters and get his injectors serviced.

Car only had a full service from an Audi dealer (with timing belt change and so on) not 2 months before the NCT test and i dont do alot of miles a week in her. Live close to work:D

Edit: Sorry mate, thanks for the tip. I am loking into doing them sort of things myself. Dont have much hands on exprince and want to get my hands dirty.

mlmdublin36

Hi,

I have a 2007 a4 avant and I failed the NCT on smoke at 3.6 I also failed the retest at 6.9.
I brought to an audi dealer and he cannot find any fault to rectify this.
Is there anyone with simular issues with a 2007 audi
I have a feeling there may be a manufacturers fault because audi ar not that keen to get involved

Thanks

homer90

mlmdublin36 wrote: »

Hi,

I have a 2007 a4 avant and I failed the NCT on smoke at 3.6 I also failed the retest at 6.9.
I brought to an audi dealer and he cannot find any fault to rectify this.
Is there anyone with simular issues with a 2007 audi
I have a feeling there may be a manufacturers fault because audi ar not that keen to get involved

Thanks

Read this thread....;)

shamwari

Bearcat wrote: »

what a flute putting petrol in a diesel....old wifes tale. Those of you who chip your diesels, this can effect the some test.

Yep. And include those who's DPF is shot or who removed it in the first place. :rolleyes:

Also one other thing I came across was with the inlet manifolds of some cars being full of oily coke, thanks to the combined efforts of the EGR and breather systems. I've had some rather filthy smokey cars get their act together when this has been cleaned out.

taintabird

shamwari wrote: »

Yep. And include those who's DPF is shot or who removed it in the first place. :rolleyes:

Also one other thing I came across was with the inlet manifolds of some cars being full of oily coke, thanks to the combined efforts of the EGR and breather systems. I've had some rather filthy smokey cars get their act together when this has been cleaned out.

True enough add to that overfilling of oil particularly with vag it can make things really messy

Greenman

Gypo wrote: »

Sometimes the car just might need a good hard run before the test

I always give my 20 year old 1.7D Vectra a good run on the motorway in 4th just before the Belgian NCT and it always sails through on emissions.

Gerone71

I just got a reading of 4.77 on smoke with my Passat 03 TDI. The oil looks like its over the upper max limit. I wonder has this contributed. I filled the tank and put REDEX in to see what effect it has. I've also been told to put 2 lts of unleaded into the full tank. Is this advisable anybody?

taintabird

Gerone71 wrote: »

I just got a reading of 4.77 on smoke with my Passat 03 TDI. The oil looks like its over the upper max limit. I wonder has this contributed. I filled the tank and put REDEX in to see what effect it has. I've also been told to put 2 lts of unleaded into the full tank. Is this advisable anybody?

There's a good probability that it did maximum means exactly that when you over fill an engine the excess has to go some where and on modern engines that's usually into the intake system and is burned in the cylinders. Its as harmful to have too much oil as not enough

vectra

mcmc wrote: »

i dont do alot of miles a week in her. Live close to work:D

There is your problem I would say
Short slow trips..
A build up of $h1te in the system
Dypetine and
A couple of good blasts around with the revs up should help..

Gerone71

Well I did the NCT retest yesterday and she passed on the smoke test. The smoke reading was 0.3 so well within the limit of 3.0. They recorded a reading of 4.77 during the 1st test.

Well what did I do? I gave it 3 weeks between tests. Put in 2 fills of diesel along with REDEX(Diesel). Warmed up the engine after a drive, took her to a quiet spot and revved the gunk out of her. This soon had the engine breathing nicely again. No need to go to a garage and be told that its going to cost you EUR500 for this and that.

the beer revolu

Somebody told me that as well as putting the additive in and driving the bejeasas out of the car, I should remove the air filter before the test.
Anyone have any thoughts on this?

flutered

remove the erg valve, there should be an an amount of soot inside the block, a toothbrush will remove it without it falling into the chamber, blank off the erg valve until after the test, remove the fuel filter, empty it, then fill it with wynns diesel injector treatment, re start, if you are still in trouble add a bottle of wynns smoke treatment to the oil.

alo1587

Also try taking out the air filter just before the test,worked for me with a 02 passat tdi