V70 D5 Just cleaned out my EGR mixer pipe - jesus!!

[Bernard333]

I did my 2003 V70 D5 at about 100k miles and it was not half as bad as yours but still caked on about 5mm thick , the strange thing is that now at over 140k miles its not come back again just a little bit which I am leaving for the time being . On mine it made no difference to performance . I wonder if its anything to do with the type of engine oil or fuel used which causes more or less of the gunge ? I have always used the cheapest supermarket diesel and engine oil which you might expect to cause more problems due to being minimum specification or is it caused more by the engine not burning the fuel fully or even driving style ? I am not implying you are not driving properly by the way , but could it be due to a lot of stop start driving when the engine is not warmed up and just drinking the fuel through , on mine it takes at least 7 to 8 miles for the engine to warm up and and even then I doubt its fully warmed up to a steady state .

[R-P]

My engine (not my car ) had done 50-60k when I did this, and there was about 5mm of gunk. Nowhere near as much as the OP.

[Speedy]

Is there a how to, to block off the EGR then?

[dave_s13]

This is how I intend to do it.

Take off the plenum pipe (the one we are banging on about in this thread).

Cut a peice of coke can (or similar) and blank off the small hole on the side of the pipe...this one



Just needs to cut your bit of metal to match the bolt hole pattern.

But, there may be a risk of your EGR valve now crudding up so much it throws up an error code or it's lack of operation doing the same.

I've read elsewhere of people doing it this way with no issues though.

[Dynosaur]

Originally Posted by dave_s13

This is how I intend to do it.

Take off the plenum pipe (the one we are banging on about in this thread).

Cut a peice of coke can (or similar) and blank off the small hole on the side of the pipe...this one



Just needs to cut your bit of metal to match the bolt hole pattern.

But, there may be a risk of your EGR valve now crudding up so much it throws up an error code or it's lack of operation doing the same.

I've read elsewhere of people doing it this way with no issues though.

Yep, some sheet metal plus Hylomar to seal will do it fine.

I've just de-blanked mine because for some reason, it breathes better with it unblocked.
Blanked, there seems to be a tinsy bit of lag and less peak torque.

Bear in mind though, that one of my injectors is in fairly imminent need of replacement (clacking/pinking under load, reduced smoothness, etc).

Blanking off gets me Emissions Service messages after a few minutes of running - but once cancelled, they don't return until the next restart.

The EGR cooler won't get sooted up because there's no through-flow of recirc'd exhaust gas.

[tykey]

Let's just remember what the EGR system is for.

I copied this next bit off the net;

"The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. This results in a cooler, more complete burn of the fuel which decreases you car's noxious emissions by prohibiting the formation of some harmful gases."

So one might expect the fuel to burn hotter and have less efficient burning (lower mpg) if you blank it off. Which toxic emissions they are talking about is anybodies guess.

How significant this is, who knows?

Having said that, lots of people blank theirs off if the smoke out of the exhaust is too high for the MOT, so it probably isn't a terminal thing to do.

[Dynosaur]

Originally Posted by tykey

Let's just remember what the EGR system is for.

I copied this next bit off the net;

"The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. This results in a cooler, more complete burn of the fuel which decreases you car's noxious emissions by prohibiting the formation of some harmful gases."

So one might expect the fuel to burn hotter and have less efficient burning (lower mpg) if you blank it off. Which toxic emissions they are talking about is anybodies guess.

How significant this is, who knows?

Having said that, lots of people blank theirs off if the smoke out of the exhaust is too high for the MOT, so it probably isn't a terminal thing to do.

Recirculation reduces NOx emissions (oxides of Nitrogen), which means less acid rain - which before the legal imposition of NOx limits, saw large swathes of Scandinavian forests destroyed by leaf-burn.
Admittedly, most of the damage was done by heavy industry - but auto-engines also bore some responsibility.

[v_matt_v]

Originally Posted by tykey

Let's just remember what the EGR system is for.

I copied this next bit off the net;

"The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. This results in a cooler, more complete burn of the fuel which decreases you car's noxious emissions by prohibiting the formation of some harmful gases."

So one might expect the fuel to burn hotter and have less efficient burning (lower mpg) if you blank it off. Which toxic emissions they are talking about is anybodies guess.

How significant this is, who knows?

Having said that, lots of people blank theirs off if the smoke out of the exhaust is too high for the MOT, so it probably isn't a terminal thing to do.

I would argue with more efficient and complet burn of fuel. Exhaust fumes reduce the temperature of combustion reducing NOx emission and that's the only benefit (for environment only). More efficient fuel burning is achieved with air only but NOx is higher. Interestingly adding exhaust fumes increases CO2 emissions. That's why CAT is needed.

[richardbell556]

do the 2.5 d 2000 suffer like this ? if so what ,where how , photos if possible... thanks

[ushes]

I'd like to clean mine, its a 185bhp and the earlier comment suggests that it's not quite as easy as the 163. It looks pretty straightforward to me, what exactly are the differences, and why would it be more complicated?

Thanks
Steve