Disco 1 Egr removal, MOT time

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
Marmaduke

Marmaduke

Well-Known Member
Posts
9,773
Location
Near the land of 'Me Duck'
I binned the egr valve and pipework years ago but I'm aware that it should be in place to pass the current mot test. Any advice on how to get around it nowadays cos I had a project one fail last year cos it was missing. I was thinking of fitting a egt gauge but I'm not one for loads of gauges.

Thanks in advance :D
 
Marmaduke said:
I binned the egr valve and pipework years ago but I'm aware that it should be in place to pass the current mot test. Any advice on how to get around it nowadays cos I had a project one fail last year cos it was missing. I was thinking of fitting a egt gauge but I'm not one for loads of gauges.

Thanks in advance :D
Click to expand...
They can only test/verify what they can see. With the engine cover on it is unlikely they can see it, (mine didn't). But if they do, I think you will be stuck with getting one from a breakers although you can buy a new EGR for about £98. Don't see the relevance of the exhaust temp gauge. They don't test for it as far as I know but check on the Gov.uk site where the new MOT testers handbook is to be found.
My searches for "replacement EGR kit" most of the time came up with EGR removal kits! (I kept mine as I did for my tdi. Not being smug. Just thinking like I did when building kit cars and getting them done before SVA came in. It was obvious it was going to come one day, so kept the stuff.) Best thought I can come up with is to find someone with one fitted and borrow it. Not the right attitude, I know, but I have even heard of people hiring them out!
 
Whilst a good idea if you plan on seriously tuning a TD5, I don't know how valuable an EGT gauge would be on a D1.
What I am sure of is that an EGT gauge will not help you pass an MOT in the least.

Assuming you have a TDi, the only sure way to pass is to refit the EGR valve (I bought one for £20 off EBay). Alternatively, find yourself a sympathetic tester.
TD5 owners are slightly better off as the tester is not permitted to remove covers and the only part of the EGR system that can be seen on a TD5 with the acoustic cover in place is the pipe from the exhaust manifold to the EGR valve. This can be fitted with a blanking plate making it look as if the EGR system is still there. That said anyone familiar with LRs will see through the ploy, but it does give them plausible deniability.
 
I think you'll just have to bite the bullet, and buy the bits you're missing ... they come up on fleablag .... or a breakers yard... a new valve is about £30 on the bay IIRC.....

Both ours were inspected quite thoroughly ....
 
Yeah, my bad, did not fully realise you were talking about a tdi and a project, thought it was TD5 and tdi. +1^^^ Still East Midlands should be good for finding used ones.
 
I've got no desire to fit a egt gauge but I thought I'd be better than just the blanking plate, I've just contacted a couple of people who breaking them on ebay so I'll see what happens. The annoying thing is I've broken over half a dozen of the blinking things and binned them :mad:
Thanks for the replies :)
 
Disco1BFG said:
I think you'll just have to bite the bullet, and buy the bits you're missing ... they come up on fleablag .... or a breakers yard... a new valve is about £30 on the bay IIRC.....

Both ours were inspected quite thoroughly ....
Click to expand...

Go scrappies, buy stuff that looks like what you need and bolt it roughly in place but not in a way that it does anything but look pretty and be happy that they can't test it's function.
 
Mine (both de-EGRed) have never failed on emissions, especially since "City diesel " came out. Don't seem to see it nowadays! Guess they must all be like it now.
Doesn't the EGR cut NOX a bit but introduce more oil into the system, especially on older models? After all, the yuck we see in it and the inlet manifold comes from there doesn't it? Perhaps someone who has failed their emissions due to a faulty EGR can jump on and give us detail.
 
The EGR reduces the NOx emissions which are a significant and serious pollutant, but not currently tested on an MOT. Therefore, an EGR removal will not cause a vehicle to fail on the emissions assessment, but will cause it to fail if the tester sees that it has been removed. Not all the crap in the inlet manifold comes from the EGR, the rocker box breather feeds oil vapour into the air intake pipe upstream of the turbo, so oil contamination of the intercooler, MAP and inlet manifold probably comes from there regardless of the presence of an EGR.
 
@Si Click - That's a very good point you raise. Most of the gunk present in the inlet manifold is the result of oil vapour delivered through the crankcase ventilation. EGR gases are always dry and consist of combustion by-products, one of them being a fine dust, known better as particulate. Besides burning NOx gases, the EGR also controls the formation of these gases by depriving the engine of small quantities of atmospheric oxygen. The engine will therefore run cooler and because of these lower temps and less oxygen, the opportunity for nitrogen to combine with oxygen is reduced, meaning less NOx gases.

Deleting the EGR will have the opposite effect as the engine will run hotter due to the richer air-fuel mixture. Apart from the increased production of NOx gases and other by-products, the oil temp will also go up and so will the oil vapour that is vented back to the inlet manifold system where it will condense.
 
NPG said:
@Si Click - That's a very good point you raise. Most of the gunk present in the inlet manifold is the result of oil vapour delivered through the crankcase ventilation. EGR gases are always dry and consist of combustion by-products, one of them being a fine dust, known better as particulate. Besides burning NOx gases, the EGR also controls the formation of these gases by depriving the engine of small quantities of atmospheric oxygen. The engine will therefore run cooler and because of these lower temps and less oxygen, the opportunity for nitrogen to combine with oxygen is reduced, meaning less NOx gases.

Deleting the EGR will have the opposite effect as the engine will run hotter due to the richer air-fuel mixture. Apart from the increased production of NOx gases and other by-products, the oil temp will also go up and so will the oil vapour that is vented back to the inlet manifold system where it will condense.
Click to expand...
This and the previous post makes me think it might be a better bet to put the EGRs back on and just keep cleaning them. Bit of a pain but..... I do very little town driving so I'm not too bothered by the NOx situation, but of course I forgot about the crankcase breather which is stupid of me considering the thing is a right pain every time I want to move something on top of the engine. People de-EGR to improve power and fuel consumption, allegedly, and that is why I did it, as well as it being an obvious constriction in the intake system it also got mucky and looked as if it was likely to seize anyway. But I have to say I don't think I ever noticed any improvement in either power or consumption. But thanks for such clear explanations, food for thought.
 
Anti-pollution regs are getting tougher and while we can exploit the "no cover removal" loophole for now, it is only a matter of time before NOx is tested or the loophole is removed. Therefore, at the very least it would be sensible to have a clean and viable EGR system in storage against the day when choice is fully removed.
 
dieseldog69 said:
be happy that they can't test it's function.
Click to expand...

Amen. I am:)

Si Click said:
Therefore, at the very least it would be sensible to have a clean and viable EGR system in storage against the day when choice is fully removed.
Click to expand...

As above ;) - I do wonder if they will ever be able to test the function, given that AFAIK, there were no official tests done at the time of type approval - unlike the CO2 emissions, which are recorded on the V5 .....
 
Disco1BFG said:
I do wonder if they will ever be able to test the function, given that AFAIK, there were no official tests done at the time of type approval - unlike the CO2 emissions, which are recorded on the V5 .....
Click to expand...

I have four V5s and all have a space for the CO (carbon monoxide) emission to be stated, but nothing for CO2 carbon dioxide.
Two of the V5s are for older vehicles so nothing is shown there, but both vehicles have a emissions test, although one is now exempt, the other two V5s are up to date, one vehicle having it first MOT last February and of course passed.
So I expect any future diesel emissions what ever they will be will be taken based on the known average for each vehicle, then banded together much the same as for early petrol vehicles.

Something that doesn’t worry me :D so back to work.
 
Last edited:
Well I've just stopped by my friendly mot garage and he said don't worry about it I'll just say it was on when I tested it. So to use the old adage....
_20190429_151436.JPG
 
You must log in or register to reply here.

Similar threads

G
Disco 4 (LR4) D4 selling advice/testing the water
Replies
7
Views
929
Calrissian
C
L
Hand brake question
Replies
14
Views
587
romanrob
R
C
What's missing ????
2
Replies
27
Views
2K
backinblack
backinblack
J
Sport V6 2012 - Is a leaking ARC an MOT fail?
Replies
0
Views
510
Jmcg95
J
D
FL2 Power steering strange issue after flywheel & clutch replacement.
Replies
0
Views
440
DanHughes92
D
Back
Top