Please don't judge. M 2.0 superb is giving me egr trouble. Had it deleted but now need it blanked off

wont the department of transport do the judging at the next mot inspection?

@Andy147 The time it takes to get to the egr your as well replacing it when your there 
you can get aftermarket ones for about £100
 

Edited 4 February, 20197 yr by DEL80Y
tag

You can't blank off the EGR on DPF-equipped cars. You'll kill the DPF.

 

Unless the DPF has already been deleted?

Has the car been through Skoda's EA189 emissions fix?

 

If so you can get a new EGR fitted for free under their Trust Building Measure. I did...

 

https://www.skoda.co.uk/owners/ea198-trust-building-measure

10 hours ago, superbdreams said:

wont the department of transport do the judging at the next mot inspection?

No emissions test in NI at the moment for diesel cars.

Hi I appreciate the replies to my previous post. But as of yet my question has not been answered. Which port do I blank off on my egr or is it best to do both. many thanks again.

It's best to do neither. EGR is too tightly into the engine and ECU to be removed without problems.

33 minutes ago, chimaera said:

It's best to do neither. EGR is too tightly into the engine and ECU to be removed without problems.

yes but if the choice was needed which port or both.

47 minutes ago, Andy147 said:

yes but if the choice was needed which port or both.

I couldn't tell you tbh. It's a bad idea and not something I've bothered figuring out.

It doesn't matter, do one, or both. Either way it'll end in tears unless you've also already removed the DPF.

1 hour ago, silver1011 said:

It doesn't matter, do one, or both. Either way it'll end in tears unless you've also already removed the DPF.

 

Then comes the MOT......................More tears.......

9 hours ago, bigjohn said:

 

Then comes the MOT......................More tears.......

he has already stated that in NI there is no check (at present)

7 hours ago, superbdreams said:

he has already stated that in NI there is no check (at present)

 

Didn't see that in this thread - presumably it's in another one?

1 minute ago, bigjohn said:

 

Didn't see that in this thread - presumably it's in another one?

Nor do I now!

He alludes to a previous post so thatr must be the case. 

Why two threads?

 

Edited 7 February, 20197 yr by Gizmo

16 minutes ago, bigjohn said:

Why two threads?

 

 

 Threads merged.

What I don't get is that post 1 says "Had it deleted".

Presumably that means disabled electronically via map changes or something?

In which case won't the valve be permanently closed to the passage of exhaust gases? So why any need to blank anything?

19 hours ago, Wino said:

What I don't get is that post 1 says "Had it deleted".

Presumably that means disabled electronically via map changes or something?

In which case won't the valve be permanently closed to the passage of exhaust gases? So why any need to blank anything?

 

Perhaps the EGR valve is leaking, ie not shutting off the exhaust gasses completely.

 

So although electrically disabled it is still passing gas.

 

I have the CFFB 2l engine.

On this engine the EGR gas is routed from the cooler at the lower rear of the engine, then into the back of the engine block on the right, looking at the engine from the front with the bonnet up.

It passes through the block then comes out on a silver pipe about 1" diameter with a flange & 2 bolts at the right front of the block, it could be blanked here.

It then routes to the inlet manifold stub just after the throttle valve at the middle of the engine.

 

Different engine types have differing EGR configurations, but EGR gas usually ends up being injected into the inlet at some point.

 

Regarding EGR & DPF interaction, I have always understood that the EGR is disabled during a regen.

 

This seems to make sense as EGR is there to reduce combustion temperature, wheras during a regen exhaust temperature has to be raised considerably to start the DPF burning.

So I wouldn't have thought deleting the EGR would affect the function of the DPF unless someone knows different.

 

Every day is a school day as they say.

EGR can have an effect on soot generation, thereby affecting soot buildup in the DPF, though I would expect less EGR to reduce soot loading since there's more fresh air entering the engine allowing more complete combustion (all other things being equal).

 

EGR's job is to dilute the inlet air so that there's less oxygen in it without affecting the volume of air present as a NOx mitigation measure. For combustion to initiate there needs to be a certain distribution of oxygen and fuel vapour in the cylinder and this is dependent on the gas volume present. Reducing the amount of excess oxygen means there's less of it present to react with atmospheric nitrogen and therefore less NOx emissions.

 

The problem with an EGR delete tune on modern engines, is that EGR functionality is tightly integrated into the rest of the engine's operation and it's difficult to disentangle it cleanly from the rest of the ECU code, which stores up problems for the future.

6 hours ago, PipH said:

So I wouldn't have thought deleting the EGR would affect the function of the DPF unless someone knows different.

 

 

https://www.darksidedevelopments.co.uk/egr-removal-delete/

 

1 hour ago, silver1011 said:

 

 

https://www.darksidedevelopments.co.uk/egr-removal-delete/

 

I don't think they understand it very well. EGR is always fully closed (I.e. no recirculation) during regen. The extra oxygen and NOx are used to oxidise the soot.