doodle bug

doodle bug

Well-Known Member
I removed the EGR from our td5 defender about 2 months ago and it seemed to run slightly better.....but now MOT time is drawing close ive been informed by our not so friendly mot man that it wont pass the emission test without the egr being refitted :(.. is this true or just another load of main dealer crap ?
 
Well I took my TD5 Disco for an MOT at the end of last month and it passed with no problems, and that's with no EGR and no CAT so the MOT tester is talking bollocks.
 
doodle bug said:
I removed the EGR from our td5 defender about 2 months ago and it seemed to run slightly better.....but now MOT time is drawing close ive been informed by our not so friendly mot man that it wont pass the emission test without the egr being refitted :(.. is this true or just another load of main dealer crap ?
Click to expand...

As Minidod says, he's talking bollocks, I'd take my custom elsewhere.
 
Hes talking crap as the egr system doesnt even work until the engine is up to temperature and you are driving along at light load so the egr valve can open and run some gas back into the inlet system.
Why did you even tell him?


Lynall
 
50 pence said:
Diesels only have to pass a smoke test.

As the others have said, he,s talking bollards !.

Del.
Click to expand...
Correct! Find another testing station who know what they're talking about.

Your engine will be running cleaner and more efficiently in terms of smoke particulates than it ever did with an operating EGR system because the combustion will have more oxygen to burn and hence produce less soot. By feeding the lower oxygen exhaust gas into the intake, diesel EGR systems lower combustion temperature, reducing emissions of nitrous oxides because NOx forms primarily when a mixture of nitrogen and oxygen is subjected to high temperature. This makes combustion less efficient, compromising economy and power. Diesel EGR also increases soot production. EGR systems can also add abrasive contaminants and increase engine oil acidity, which in turn can reduce engine longevity.
 
Last edited:
Just removed the EGR on mine, seems to run better.
Bloody should do aswell after seeing how clogged up with gunk it was.
 
EGR removed and emissions reading on MOT was 0.6, less than 3 is a pass. It was 2.6 before the injectors were serviced and EGR removed
 
Mine failed at 4.9 before I removed the EGR then it passed with 2.1
Was really full of Sh!te.
One day I will also clean out the inlet manifold because that was really manky inside.
 
Shifty1962 said:
Correct! Find another testing station who know what they're talking about.

Your engine will be running cleaner and more efficiently in terms of smoke particulates than it ever did with an operating EGR system because the combustion will have more oxygen to burn and hence produce less soot. By feeding the lower oxygen exhaust gas into the intake, diesel EGR systems lower combustion temperature, reducing emissions of nitrous oxides because NOx forms primarily when a mixture of nitrogen and oxygen is subjected to high temperature. This makes combustion less efficient, compromising economy and power. Diesel EGR also increases soot production. EGR systems can also add abrasive contaminants and increase engine oil acidity, which in turn can reduce engine longevity.
Click to expand...
 
I had a de cat and I removed my egr. Total nonsense unless you also do a remap. I have just gone to the expense of putting everything back on and will try remember to post why difference it makes. However I have just ordered a recon turbo. Going for the cleanest most efficient burn next. If it’s a weaker car after going back to stock I’ll let you know - should be next weekend.
 
See here 8. Nuisance - MOT inspection manual: cars and passenger vehicles - Guidance - GOV.UK (www.gov.uk)

It is clear that if a tester observes an EGR valve is missing it is a Major defect and hence a fail
8.2.2.1. Exhaust emission control equipment
You only need to check components that are visible and identifiable, such as diesel oxidation catalysts, diesel particulate filters, exhaust gas recirculation valves and selective catalytic reduction valves.

If a diesel particulate filter has clearly been cut open and rewelded, you should reject it unless the vehicle presenter can show evidence that there was a valid reason to cut it open, such as for filter cleaning.

Defect Category
(a) Emission control equipment fitted by the manufacturer missing, obviously modified or obviously defective Major
(b) An induction or exhaust leak that could affect emissions levels Major
(c) Evidence that the diesel particulate filter has been tampered with
 
Just blank off the exhaust gases at the end of the exhaust manifold that feeds the egr, I used a piece of aluminium. That way everything looks standard when glanced at but you have the benefit of not having hot crapy air being fed into your inlet.
I've got an early td5 so the valve isn't as restrictive to airflow as the later type so a win win come mot time.
 
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