Other Emissions

had my mot today and also a print out of the emissions

Wondering out of curiosity if anyone else would mind to share what ur discovery’s are please

Thks as always and yeh i know I need certifying but thats been a given for years , lol

TDV6 , 2.7 EGRS, blanked , not chipped

I take the air filter out and it breathes out nothing, no smoke, no issues, every time.
Thought everyone did that.
Not much point in hunting out my data is there then.

Bantam1 said:

I take the air filter out and it breathes out nothing, no smoke, no issues, every time.
Thought everyone did that.
Not much point in hunting out my data is there then.

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Looks like ur the only one that replied

Another thread that’s bombed, lol

Disco 4 passed yesterday, details are n the glove box, car seems to have disappeared with no.1 son, he must be out to Impress the latest girlfriend !

freelance said:

Disco 4 passed yesterday, details are n the glove box, car seems to have disappeared with no.1 son, he must be out to Impress the latest girlfriend !

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Great news, u lend ur disco out, are u mad, lol

Funny enough saw a really nice D4 the other day in like a cherry red, looked really nice and they had rock sliders on instead of side steps

Mine failed it’s mot last year all because the door lock decided to fail whilst on the mot ramp

This year just advisories to replace the front brake hoses, everything else and all the work I had done the past year was fine , got one original brake hose as well on the near side back, going to do that at the same so every brake hose will then be replaced

gstuart said:

had my mot today and also a print out of the emissions

Wondering out of curiosity if anyone else would mind to share what ur discovery’s are please

Thks as always and yeh i know I need certifying but thats been a given for years , lol

TDV6 , 2.7 EGRS, blanked , not chipped

View attachment 183275

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Would be interested to know what the emissions level are when travelling through Central London, and if you would be able to get an exemption cert so that you don't pay that as well as the congestion charge???

MoT last week. Opacity Mean Value 0.16.

Bog standard TD5 Auto.

Feathers McGraw said:

MoT last week. Opacity Mean Value 0.16.

Bog standard TD5 Auto.

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Thks , sorry for the daft question but what would be the final reading like ur good self on my test sheet plse

Is it the 0.50m 1 , thks

gstuart said:

Thks , sorry for the daft question but what would be the final reading like ur good self on my test sheet plse

Is it the 0.50m 1 , thks

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I reckon it is.

Not sure what my FL is. Haven't had it long enough to have MOTd it yet. Not due until October. Will try to remember to post up again when it does. However, that's just a very rough-and-ready estimate of large particulate emissions. Cars have lots of different sorts of pollutant that they emit:

1. Unburned hydrocarbons (HC). Just fuel that doesn't get completely burned.
2. Carbon Monoxide (CO) which is a poisonous gas but of nut much environmental importance.
3. Carbon dioxide (CO2) which is invisible and directly proportional to fuel consumption. It's currently a very topical pollutant because of climate change.
4. Oxides of nitrogen (NOx). They're a group of chemicals which are a huge problem for air quality and increasingly responsible for various lung diseases. EGR and AdBlue help reduce them.
5. Particulates. Tiny particles of carbon ("soot"), also a problem for air quality and also responsible for various lung diseases. DPFs help reduce them.

Of those, only 1 and 2 can be measured by MOT gas analysers but most diesels probably won't need to have them measured. They're generally not considered a huge problem these days provided your cat is working.

3 is not measured at MOT at all, and never has been. It's also not relevant to any of the "Low Emissions Zones" that are currently around or planned. The latest, cleanest "Euro 6" Range Rover will emit more of it per mile than a knackered 1970s Mini that's chucking out so much smoke you need to turn your headlights on when you're following it!

4. is not measured at MOT at all, and never has been. The MOT gas analysers can't detect it.

5. is measured very crudely by the MOT "smoke meter". It's better than not measuring it at all, but compared to the type approval test methods for measuring particulates, it's not very demanding.

gstuart said:

Thks , sorry for the daft question but what would be the final reading like ur good self on my test sheet pls

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Avocet1 said:

Will try to remember to post up again when it does.

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Here's a printout from my TD4 a couple of years ago.

Doug (My MOT tester) only ran the test once, as it was clean as a whistle on the first run.

0.07 is pretty darned clean! Not even 5% of the limit.

Avocet1 said:

0.07 is pretty darned clean! Not even 5% of the limit.

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That was after an "Italian" tune up, on the A30 (duel carriageway), on the way to the test, with Shell V Power and Comma Diesel Magic in the tank!! Oh and the Synergy was turned to MAF compensation only, so no boosting was going on. The car had also had a full service the day before the MOT, as I always do. I don't think preparation for the MOT is a bad thing.

Nodge68 said:

That was after an "Italian" tune up, on the A30 (duel carriageway), on the way to the test, with Shell V Power and Comma Diesel Magic in the tank!! Oh and the Synergy was turned to MAF compensation only, so no boosting was going on. The car had also had a full service the day before the MOT, as I always do. I don't think preparation for the MOT is a bad thing.

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I'm a big fan of the "Italian tune-up". What's more, there is some evidence that it actually works. This guy has done a very presentable summary of a number of research papers:



Certainly, it's something I do (say) once a month. On Mrs. Avocet's late X-Trail, a load of people on the forum complain about inlet manifolds and EGR valves getting full of oily carbon sludge. At 100,000 miles I was doing some work on her engine, so I took the EGR valve apart for a quick look down into the inlet manifold and was pleasantly surprised at how clean it was. Just a fine layer of dry soot. I couldn't see right down into the inlet manifold and it's a pig to remove, so I didn't bother, but what I was able to see looked pretty clean. One thing I noticed was that if she'd been driving it (she's not an "enthusiastic" driver) for a few weeks, I'd take it out and give it something near full revs on a wide open throttle for 10 seconds or so (easy with all the hills round here, but could be a licence-loser if you live in a flat area unless you have a very heavy caravan or something to load it up with)! When I did it, I'd see a bit of smoke out the back. If I did it a second time, I'd see less. Hardly any the third time.

My theory is that all the oily gunge that seeps past the turbo bearings or through the crankcase ventilation system sits in the fins of the intercooler and all the induction pipes. At max power, the flow of air through the induction system is high enough to drag it through into the combustion chambers where it can be burned, and the higher combustion temperatures at max power, ensure that it DOES get burned, rather than just condensing on the backs of the valves and the inlet manifold. Whether it's true or not, I don't know, but I suspect there's some truth in it.

It would be interesting to try a poll to see if there's any correlation between those who get the best MPG on the forum and those who have carbon deposit problems....

Avocet1 said:

give it something near full revs on a wide open throttle for 10 seconds or so (easy with all the hills round here, but could be a licence-loser if you live in a flat area unless you have a very heavy caravan or something to load it up with)! When I did it, I'd see a bit of smoke out the back. If I did it a second time, I'd see less. Hardly any the third time.

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When I have to run my wife into work (usually only once a week) there is a nice long steep gradient out of the town and then a junction to another road and another junction to join the by-pass, all uphill. Tis good to let it have a nice rev climbing up and I reckon it doesn't hurt the engine as it's had 20 miles of open A roads to warm through. The advantages of living in a rural setting.