EGR Valve & Blanking

Carouser · Sep 25, 2016

Hello All

Apologies if I am going over old ground here, but I've carried out a search and can't seem to find anything specific on the subject.

Could someone explain to me what the EGR Valve does and why many people recommend 'blanking' it off?

Some reports state that the EGR Valve causes more harm than good and that blanking it is the sensible thing to do.

What are the pro's and con's in doing so, and is it easy to do?

Many thanks as ever

Carouser

julgre · Sep 25, 2016

I don't know about the pros and cons of the egr but since I blanked mine my mpg has improved and the truck feels it has more torque.

gfromleeds · Sep 25, 2016

The egr is exhaust gas recirculation and it does exactly what it says on the tin!
It basically takes exhaust gas and blows it back into the air intake its supposed to reduce emissions which it does! But what it also does is blow all the exhaust carbon and gunk back into the engine which has been universally agreed does nothing positive for the health of the engine!
So we fit a blank so it cant blow the **** back into the intake and clog everything up!
Its a doddle to fit takes about 10 minutes theres a how to on here somewhere and itll save you an expensive repair some day

Carouser · Sep 25, 2016

gfromleeds said:
The egr is exhaust gas recirculation and it does exactly what it says on the tin!
It basically takes exhaust gas and blows it back into the air intake its supposed to reduce emissions which it does! But what it also does is blow all the exhaust carbon and gunk back into the engine which has been universally agreed does nothing positive for the health of the engine!
So we fit a blank so it cant blow the **** back into the intake and clog everything up!
Its a doddle to fit takes about 10 minutes theres a how to on here somewhere and itll save you an expensive repair some day

Brilliant! Thanks, gfromleeds.

So a few obvious questions are...

1) Will the Nav still pass the emissions test with the EGR blanked off; and

2) Aside from the reduction of carbon and other associated **** being fed back into the engine, do we see any notable improvements in performance / economy?

3) Will the engine management light come on as a consequence of doing this?

Could never understand why the Euro4 was cleaner and better for the environment, but consumed more fuel than a Euro3.

Sounds like complete booolllarrrks to me...

Regards

Carouser

lookskyward1 · Sep 25, 2016

I think Gavan explained it nicely. :rockon

The chances of the blank being detected by anyone but yourself is highly unlikely as it just looks like a gasket. The engine will in fact produce less smoke for the MOT. The good thing the emissions test is for visual smoke only anyway, so a win win.

Don't hold your breath for any improvement of economy or improvement in power, although some have seen this. The main reason for doing this is to preserve the condition of your engine, and reduce the chances of fault codes and breakdown due to EGR valve failure. You'll not get any fault codes up as the Euro4 does not read gasses passing through it.

You're right regarding the Euro4 being strangled by emissions control so much it eats more fuel, it just doesn't make much sense:screwy

You might find this additional blank of interest: http://www.nissan-navara.net/22-performance-upgrades/26718-another-d40-egr-mod.html

julgre · Sep 25, 2016

It could throw up a fault but you can drill a small hole in the blank to fool the ecu

lookskyward1 · Sep 25, 2016

julgre said:
It could throw up a fault but you can drill a small hole in the blank to fool the ecu

It shouldn't the only ones that throw up a fault code are the newer Euro5 models, so no need to drill holes in the blank for a Euro4.

Carouser · Sep 25, 2016

lookskyward1 said:
I think Gavan explained it nicely. :rockon

The chances of the blank being detected by anyone but yourself is highly unlikely as it just looks like a gasket. The engine will in fact produce less smoke for the MOT. The good thing the emissions test is for visual smoke only anyway, so a win win.

Don't hold your breath for any improvement of economy or improvement in power, although some have seen this. The main reason for doing this is to preserve the condition of your engine, and reduce the chances of fault codes and breakdown due to EGR valve failure. You'll not get any fault codes up as the Euro4 does not read gasses passing through it.

You're right regarding the Euro4 being strangled by emissions control so much it eats more fuel, it just doesn't make much sense:screwy

You might find this additional blank of interest: http://www.nissan-navara.net/22-performance-upgrades/26718-another-d40-egr-mod.html

Fantastic! Thank you Lookskyward1 - very helpful as ever. Much appreciated.

Regards

Carouser

Carouser · Sep 25, 2016

Just purchased a blanking place and gasket.

Might sound like a stupid question, but which side does the gasket go?#

Carouser

cedicol · Sep 26, 2016

The engine side.

gfromleeds · Sep 26, 2016

Ive had my blank in since 2 days after i bought it (about 3 years now) so its passed 2 mots and never thrown up any problems

landmannnn · Sep 26, 2016

Carouser said:
Brilliant! Thanks, gfromleeds.

So a few obvious questions are...

1) Will the Nav still pass the emissions test with the EGR blanked off; and

2) Aside from the reduction of carbon and other associated **** being fed back into the engine, do we see any notable improvements in performance / economy?

3) Will the engine management light come on as a consequence of doing this?

Could never understand why the Euro4 was cleaner and better for the environment, but consumed more fuel than a Euro3.

Sounds like complete booolllarrrks to me...

Regards

Carouser

The other thing the EGR does is to reduce combustion temperatures in the cylinders. By dragging some old exhaust gases in the combustion is less efficient which means less power and less economy.
Apparently, the slightly lower combustion temperatures reduce some of those nasties produced by diesels.
There is a view that the higher temperatures will damage the engine, but that view is generally one held by internet sofa surfers who think they know everything.

Carouser · Sep 26, 2016

Thank you all for your responses; much appreciated.#

My blanking plate and gasket (assumed there would be two upon reflection, but seems there's only one hence my question as to which side it should sit) should arrive tomorrow so will have it fitted at the weekend.

Will consider the additional blanking plate mod too.

This really is a fantastic forum. Proud to be a Nav owner despite all of the negativity right now, and glad to be part of this group.

Regards

Carouser

gfromleeds · Sep 26, 2016

Carouser said:
Thank you all for your responses; much appreciated.#

My blanking plate and gasket (assumed there would be two upon reflection, but seems there's only one hence my question as to which side it should sit) should arrive tomorrow so will have it fitted at the weekend.

Will consider the additional blanking plate mod too.

This really is a fantastic forum. Proud to be a Nav owner despite all of the negativity right now, and glad to be part of this group.

Regards

Carouser

The only negatives on the d40 navara is the timing chain and chassis rust
I see from you signature your aware of both of these so once youve done them and maintain a regular service you should have a pretty reliable truck
I would recommend the chassis strengthening plates too before your underseal if you can get somone to fit them

pathfinder · Sep 27, 2016

Guys is the egr blanking advisable on the np300 euro 5 also?

Carouser · Sep 27, 2016

gfromleeds said:
The only negatives on the d40 navara is the timing chain and chassis rust
I see from you signature your aware of both of these so once youve done them and maintain a regular service you should have a pretty reliable truck
I would recommend the chassis strengthening plates too before your underseal if you can get somone to fit them

Thank you gfromleeds.

I have purchased some of Rich's stiffening plates (2 x inner and outer for each side) which are winging their way to me in the post as I type.

Rust Buster are going to remove the bed and fully inspect before treating, welding and sealing.

They don't remove the bed as a matter of course, but when I brought the issue to their attention via this forum, they realised the extent of the problem and offered to go the extra mile (at extra cost of course), but in my opinion, if the chassis is in good order, (as the rest of the truck is immaculate) it will be well worth it.

I love my truck and she has to last me for at lest another five years, so investing now should pay off going forwards.

Thanks again for all of your help.

Regards

Carouser

Carouser · Oct 3, 2016

pathfinder said:
Guys is the egr blanking advisable on the np300 euro 5 also?

Apologies for the delayed response, Pathfinder. I can't say for sure, but based on the information shared with me, it sounds like EGR blanking is the way to go for all vehicles that have one.

The only issue I can see between the Euro4 D40 (mine) and anything beyond is that the engine management system will throw up a fault code as it measures what's thrown through the EGR.

Whether this can be cancelled/fooled/reset is one for the technical guys I'm afraid; I'm still very much a newbie!

I think the practise of blanking the EGR is illegal, so if a fault code is shown (more likely on a Euro5 and beyond) or the blanking plate is detected based on visual inspection it *could be* an MOT failure.

Cheers

Carouser

lookskyward1 · Oct 3, 2016

pathfinder said:
Guys is the egr blanking advisable on the np300 euro 5 also?

Sorry for the delay.

The newer D40's had sensors that detected a lack of exhaust through the EGR which meant a fault was logged in the ECU. Drilling a 6mm hole in the blank seems to work for some but not all.

Your NP300 is likely to have these sensors as well so it is probably not a feasible option for you unless you are willing to try a blank with a small centre hole to allow a small amount of fumes through so as not to trigger a fault code.

pathfinder · Oct 4, 2016

Carouser and Keith thanks on the info about blanking the egr.I think for the time being i will let it go since i am under warranty yet.Although Carouser about the low wistling sound you get around 1-2k rpms i do have it too and i believe its jusy the turbo.I had it on my previous hilux and on my audi and on my escort.Except if its something totally different you getting

kerryden393 · Aug 1, 2024

gfromleeds said:
The egr is exhaust gas recirculation and it does exactly what it says on the tin!
It basically takes exhaust gas and blows it back into the air intake its supposed to reduce emissions which it does! But what it also does is blow all the exhaust carbon and gunk back into the engine which has been universally agreed does nothing positive for the health of the engine!
So we fit a blank so it cant blow the **** back into the intake and clog everything up!
Its a doddle to fit takes about 10 minutes theres a how to on here somewhere and itll save you an expensive repair some day

How can you stop the fault code showing up

EGR Valve & Blanking

Carouser

julgre

gfromleeds

Carouser

lookskyward1

julgre

lookskyward1

Carouser

Carouser

cedicol

gfromleeds

landmannnn

Carouser

gfromleeds

pathfinder

Carouser

Carouser

lookskyward1

pathfinder

kerryden393

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