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UK MOT diesel emissions testing

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Old Mar 9th, 2019, 10:19   #1
malp43
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Default UK MOT diesel emissions testing

My 2013 V70 D2 has just had it's annual service but then failed its MOT on emissions:

8.2.2.2(f) Exhaust emissions test aborted because smoke levels are significantly in excess of the specified limit values. (The MOT was carried out at another garage)

I'm not convinced that the test is being carried out correctly, specifically that the car is being tested against the correct emissions level, as the garage told me the level dropped from 1.5 to 0.5 in May 2018.

According to the current official UK Government MOT Manual a diesel car should be tested against the lower of a default value or the vehicle manufacturer's plated value. The manual shows the default value for a 2013 car as STILL being 1.5, but where do I find the official Volvo plated value?

According to this web page: <https://www.gov.uk/government/publications/mot-changes-from-may-2018-guidance-for-mot-testers/diesel-vehicle-emission-limits#how-to-find-the-manufacturers-plate-value> it may appear on the plate that states the vehicle's weight limits, but on my V70 the weight plate doesn't have anything that resembles an emissions value.

So is there another plate somewhere on the car?

Mal
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Old Mar 9th, 2019, 11:44   #2
Piers1956
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Just a thought. In vehicle details on your V5 Reg Doc Section 4 Sub-section V Exhaust Emissions.

Lists:-
1 CO (g/km or g/kwh) My D5 is 0.091 g/kwh. Search www and you will learn how to convert g/km to g/kwh/ ... it's nearly rocket science.

2 HC not Shown

3 NOx Same measurement as 1 above

4 HC + NOx (g/km) So if 3 is given and 4 is given then 2 = 4-3

5 particulates Same measurement as 1 above

It must be official and true, the Government are always to be trusted.

Good Luck
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Old Mar 10th, 2019, 07:50   #3
dingov70
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Mornig Malp43 , I am an MOT tester . So here goes in may 2018 the rules changed regarding diesel emissions . The basic change was a lowering of permissible emissions for diesels & we are now required to look for a square box with the emission value .

Just read this link https://www.gov.uk/government/public...mission-limits . it shows the type of thing we look for .

It is also common for there to be a sticker under the bonnet with the value on it or combined with other info such as air con refrigerant type . I have also tested later model cars of all manufacturers that sometimes do not have a limits value present , so then you simply test to default limits , as your analyser requires the plate value to be entered , reverting to default limit if the value is not present or illegible

I am concerned the tester aborted the emissions test as this would indicate a very badly smoking exhaust that would be very obvious to you . I test mainly vans & normally reserve the abort for builders transits

Diesel emission testing also required very specific criteria be met , firstly there is oil in the engine & it has reached 80C in temp or lower only if specified by manufacturer , that the accelerator is pressed from idle to full throttle ( engine revved to limiter ! ) smoothly & in one second and released immediately the limiter is reached & this can repeated upto 6 times . The machine then generates a report that you should have along with your refusal certificate . Just make sure oil temp was checked & was 80C or hotter , that is very important for a correct emission test
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Last edited by dingov70; Mar 10th, 2019 at 07:57.
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Old Mar 10th, 2019, 13:49   #4
malp43
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Hi Dingo,

Thanks for your input. I'm concerned about the abort as well, so glad to hear your take on this. There is no visible smoke coming from the exhaust. I was not told if the abort was initiated by the test equipment or by the subjective opinion of the tester.

I had already looked at the link you posted which is what got me asking the question about where to find the plate. The examples in that link show it on the weight limit plate, which on my V70 is on the rear of the offside B pillar, but there is nothing on it that looks like an emissions value. Nor can I see anything in the engine bay.

From looking at Section 8.2.2 of the MOT Manual I understand that the default for my car, first registered May 2013, is still 1.5; it is cars from 2014 onwards that have the lower default value of 0.7 applied. Is that correct? Incidently what is that value measuring, what are the units?

I have reservations that the engine was up to temperature for the test, as it was serviced first I believe, so would have stood for an hour or two befire being taken to the VTS further down the road. The service was carried out by an independent specialist on the VOC list which does not do in house MOTs.

The service garage recommended that I first try a dose of additive in the tank which was appled on the day of the test (last Thursday) and then at least a 40 mile drive. I have done more than that and will be taking the car back in for retest first thing tomorrow. I aim to take a very long way round to get the engine fully up to temperature.

Mal

Last edited by malp43; Mar 10th, 2019 at 13:52.
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Old Mar 10th, 2019, 19:35   #5
Billggski
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My D2 V70 also failed its second MOT on emissions, it was tested before its annual service and then passed afterwards.
(Main dealer)
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Old Mar 11th, 2019, 08:02   #6
dingov70
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Morning Mal , sorry for late reply but busy busy busy .

It would not surprise me to discover your car does not have the limit value displayed as I regularly find cars of this age that have no limit visible . Therefore you advise no limit plate visible & revert to default limit of 1.5

The choice to abort is the testers when you can see escessive volumes of smoke , this coats the sample probe / pipe & internals of the smoke emter , leading to inaccurate readings for following vehicles unless cleaned .

The test samples the emitted crud from the exhaust by shining a laser spot onto a receiver . In clean air , freshly cleaned optics it records all the light emitted being received from the laser should be zero . Any smoke , moisture , flying carbon chunks interfere with the laser transmission . The less light falling on the receiver the dirtier the emissions ( goblins get involved & do pretty clever maths , giving you the readings ) . It is referrd to as extinction readings for some reason , suppose becasue to extinguish the light

https://www.mot-testing.service.gov....ml#section_8.2 is the relevent pages to read .

I would go to test station & politely ask to see the amanager & get him to show you the plate value they used for the smoke test . If he cannot or will not ............. I wil not say anything further ( not professional )
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