Failed NCT Emissions Diesel 1.4

harry999

Hi I have a 07 1.4 Toyota Corrola 1.4 & failed the NCT on Emissions. I did not drive the car hard before hand, just drove it 15 minutes to NCT centre.

What do I need to do so it passes on the re-test? Thanks

ninty9er

take it for a warm up spin on a motorway or N route to get the temperature up

crasy dash

Go buy a bottle of dipetane from your local motor factors add it to your tank of diesel and burn around for a few days before your test it should fly it then

BorneTobyWilde

New fuel filter
New air filter
Add a product to lower emissions, Ask in motor factors...

harry999

Should it be enough to put dipetane in the diesel a few days before & then take it for a warm up on motorway for 20 mins before test, or do I need to get a mechanic to look at it? Thanks

pred racer

What did it actually fail on?

Senna

What are the figures on the report sheet and what was the fail level?
What temp was the engine?

kaiserjim

Diptaine

harry999

It failed the smoke section of the test

I had smoke 3.840/m & should under 3.00/m

Engine/Oil Temperature was 88 degree's C

harry999

With the fail results do you think to put dipetane in the diesel a few days before & then take it for a warm up on motorway for 20 mins before test, or do I need to get a mechanic to look at it? Thanks

kaiserjim

harry999 wrote: »

With the fail results do you think to put dipetane in the diesel a few days before & then take it for a warm up on motorway for 20 mins before test, or do I need to get a mechanic to look at it? Thanks

Personally id take a chance that diptaine would do the job. Put it in the tank and drive it like you stole it for a few days and a good drive before your test.

harry999

So what do people think? Should I use dipetan, then drive it hard for a few days & chance the test again? Thanks

Bigus

I think at that level of smoke chance a 28 euro retest with just the dipethane but have a look at the airfilter yourself first only a few quid for a new one and DIY fit.

road_high

harry999 wrote: »

It failed the smoke section of the test

I had smoke 3.840/m & should under 3.00/m

Engine/Oil Temperature was 88 degree's C

You weren't massively over. Witha drop and Diptane and a proper good warm up beforehand should bring her under, asuuming there's no EGR problems or the like.

cadaliac

OP - is the car smoky when you drive it? As in, do you sometimes see plumes of smoke in the mirror after hard acceleration?
I wonder did the tester in the NCT center try very hard to bring down the soot levels.
You can sometimes hear them reving and reving and rving some cars. This is to get the levels under the limit. When the car is being reved, lets say, if the car is just over the limit and the tester sees that the level is reducing gradually, they usually keep reving the car until the car has a acceptable level of soot/smoke (or whatever they name it).
It happened to me a few years back with a diesel golf i had. I was worried about all the reving the tester was doing and I asked him about it when he gave me the cert. He told me that he saw that the car was gradually reducing with every rev and that's how he got the levels down to pass the test.
As suggested earlier, take the car for a good run in a lower gear/ high revs sinario. You should see lots of smoke after a while. This is good. Unless, of course, there is something wrong with the car and the tester already tried to reduce the levels without success.

nct tester

a diesel car HAS to get at least 7 'revs' before the computer will actually fail it, if the figures are reducing significantly each time but still fails, then its at the testers discretion as to whether he performs the test again. He doesnt have to perform the test again though if he feels that smoke levels are not reducing enough for a pass second time round. There is no way of knowing by looking at the fail sheet whether the test was performed once, twice or even three times. I would say (by the reading it failed on) that the car would pass after a change of air filter, fuel filter plus diesel additive and a hard drive, (low gear, high revs) to the retest. obviously no need to change air or fuel if they were done recently as this wont make any difference. hope it passes anyway, best of luck.

mgbgt1978

And when you arrive at the Test Centre turn the engine off...do not let it idle for more than a minute or so (just to allow the turbo to spin down).
Any diesel left idling for more than 10 minutes or so will give a very high smoke reading, as most of the carbon build up takes place at low revs and under mininum stress.

Senna

Run a tank of diptaine through it, add €5 of petrol to the next tank and give it a good hard drive before the NCT. Arrive just a couple of minutes before your test is due and you should pass no problem, your only just above a fail and your engine temp could be a bit higher.

I add €5 petrol to older diesels, yours is fairly modern, so not sure how advisable that is.

harry999

Hi I got dipetane last night, so going to change the air filter & put in the dipetane into the diesel or re-test. If I put in the dipetane today(I currently have a full tank of diesel) & rebook in for test on friday. Between now & friday I prob just use 1/4 of full tank of diesel, would this be enough ? or would I be better off to put in dipetane now & use full tank before re-test. This would mean the re-test would be first week after xmas?? Thanks