Hi. I'm sure this has probs been covered but is an EGR delete an MOT fail in 2019?

If noticed by tester, yes.

https://www.mot-testing.service.gov.uk/documents/manuals/class3457/Section-8-Nuisance.html#section_8.2

8.2.1.1a for petrols

8.2.2.1.a for diesels

 

 

Defect	Category
Emission control equipment fitted by the manufacturer: missing, obviously modified or obviously defective	Major

 

As well as being an MOT fail it is lazy and irresponsible to knowingly remove an active emissions control device for no reason since deletion of the EGR system does not improve performance on a diesel engine.

The best solution is always to clean and maintain the EGR system correctly and replace defective parts when necessary.

30 minutes ago, sepulchrave said:

As well as being an MOT fail it is lazy and irresponsible to knowingly remove an active emissions control device for no reason since deletion of the EGR system does not improve performance on a diesel engine.

The best solution is always to clean and maintain the EGR system correctly and replace defective parts when necessary.

But race car

3 hours ago, sepulchrave said:

As well as being an MOT fail it is lazy and irresponsible to knowingly remove an active emissions control device for no reason since deletion of the EGR system does not improve performance on a diesel engine.

The best solution is always to clean and maintain the EGR system correctly and replace defective parts when necessary.

Is there anything you could recommend to clean the Egr valve without removal? I have a rough idle, kind of like the engine revs drop too low and the cabin shakes, would like to rule this out.

3 hours ago, sepulchrave said:

 deletion of the EGR system does not improve performance on a diesel engine.

 

Although it doesn't increase outright horsepower and torque, removal does actually improve mid range torque and overall fuel economy,

This is down to the fact that reintroducing exhaust gas into the inlet charge actually reduces cylinder combustion temperatures which in turn reduces the production of NOx gasses but also decreases the engines thermal efficiency at part load.

So by not introducing EGR at part throttle the thermal efficiency of the engine is increased which creates more torque and higher fuel efficiency.

 

 

19 hours ago, sepulchrave said:

As well as being an MOT fail it is lazy and irresponsible to knowingly remove an active emissions control device for no reason since deletion of the EGR system does not improve performance on a diesel engine.

The best solution is always to clean and maintain the EGR system correctly and replace defective parts when necessary.

The car was fitted with EGR delete when purchased 4 years ago. I'm trying to get all the parts together to refit EGR. 

ASZ or BLT engine code?

Pretty sure I've got a spare EGR for an ASZ looking for a good home.

18 hours ago, BashRacing said:

 

Although it doesn't increase outright horsepower and torque, removal does actually improve mid range torque and overall fuel economy,

This is down to the fact that reintroducing exhaust gas into the inlet charge actually reduces cylinder combustion temperatures which in turn reduces the production of NOx gasses but also decreases the engines thermal efficiency at part load.

So by not introducing EGR at part throttle the thermal efficiency of the engine is increased which creates more torque and higher fuel efficiency.

 

 

 

On the other hand, the mean increase in EGT caused by EGR deletion almost certainly reduces MTBF on the turbo as well as increasing harmful emissions for no discernible benefit in performance.

Theory crafting aside of course.

No doubt that EGR deletion increases harmful NOx emissions but at light load where EGR is used the EGT's are well within turbo tolerances so wouldn't increase failure rates.

Why does it cause smoke on idle when the EGR is fitted? Thats what mine did until i blanked the valve.

EGR tends to increase particulate emissions, due to the less complete combustion that occurs.

11 minutes ago, JWvrs25 said:

Why does it cause smoke on idle when the EGR is fitted? Thats what mine did until i blanked the valve.

 

The valve was most likely not seating correctly

 

2 minutes ago, Wino said:

EGR tends to increase particulate emissions, due to the less complete combustion that occurs.

 

Correct which is why we needed EGR , SCR and DPF on newer vehicles

11 minutes ago, Wino said:

EGR tends to increase particulate emissions, due to the less complete combustion that occurs.

 

The ECU reduces fuelling algorithmically to compensate during EGR, this is mapped out by most tuners.

Not sure if you're disputing what I said or agreeing? Or what?

28 minutes ago, Wino said:

Not sure if you're disputing what I said or agreeing? Or what?

 

Augmenting.

On 02/01/2019 at 12:25, Wino said:

If noticed by tester, yes.

https://www.mot-testing.service.gov.uk/documents/manuals/class3457/Section-8-Nuisance.html#section_8.2

8.2.1.1a for petrols

8.2.2.1.a for diesels

 

 

Defect	Category
Emission control equipment fitted by the manufacturer: missing, obviously modified or obviously defective	Major

 

 

Larger engine covers can be found on Passats and Audis 

18 minutes ago, sepulchrave said:

 

Augmenting.

Not sure about that. If mpg is adversely affected during EGR use, then logically fuelling must increase for a given power output?

2 hours ago, Wino said:

Not sure about that. If mpg is adversely affected during EGR use, then logically fuelling must increase for a given power output?

 

MPG is not measurably affected, the ECU calculates the reduced oxygen content and reduces fuel accordingly, the engine therefore behaves like a smaller capacity engine without a loss in pumping efficiency or a reduction in compression ratio.

The main issue is that it's an unreliable, crude system prone to clogging and fouling.

I think your first 5 words there are a triumph of optimism over reality.

1 hour ago, Wino said:

I think your first 5 words there are a triumph of optimism over reality.

 

Ok, please quantify your opinion, a simple percentage will do.

As yours is the more improbable opinion (an emissions reduction technology with zero measurable performance reduction), I invite you to supply supporting data for your assertion.

Government years ago: "buy a diesel vehicle they pollute less!!!"

 

Government now: "Actually we f****d up, diesel bad booo!!!. 

 

13 minutes ago, Gt4thomas said:

Government years ago: "buy a diesel vehicle they pollute less!!!"

 

Government now: "Actually we f****d up, diesel bad booo!!!. 

 

 

I've always known that diesels are far more hazardous to people, the idea was to reduce CO2 emissions because for some reason atmospheric CO2 levels are more important than peoples lives.

21 minutes ago, sepulchrave said:

 

I've always known that diesels are far more hazardous to people, the idea was to reduce CO2 emissions because for some reason atmospheric CO2 levels are more important than peoples lives.

I'm very interested to see if the government/industries can sort out the pollution in our lifetime.

 

An all electric future will be the death of car culture for better or for worse.