Disco 2 EGR Readings

Andy Warren · May 2, 2021

Hi all, I just wondered after putting my Foxwell on the D2 if I should be getting any readings from the EGR side of things,see pic. this was at idle but there's no change when revved (both whilst stationary). If there is a problem is it likely to be the EGR valve itself or the solenoid valve ? Thanks in advance.

sierrafery · May 2, 2021

Hi. The EGR would not kick in stationary only under load and if it was a probem with a part of it there shoud be a fault code logged

Andy Warren · May 2, 2021

sierrafery said:
Hi. The EGR would not kick in stationary only under load and if it was a probem with a part of it there shoud be a fault code logged

Thanks for that. I hoping to get it on the road in a couple of weeks so once I'm happy with the way it runs I'll probably blank the EGR anyway as the inlet manifold is clean & I want to keep it that way.

raywin · May 2, 2021

UOTE="Andy Warren, post: 5148031, member: 138307"]Thanks for that. I hoping to get it on the road in a couple of weeks so once I'm happy with the way it runs I'll probably blank the EGR anyway as the inlet manifold is clean & I want to keep it that way.[/QUOTE]

It's a good idea, I took mine out, but decided to put it back as MOTs get tighter, I just blanked the flex from the exhaust manifold, almost impossible to see, and keeps all that muck out of the manifold.

Andy Warren · May 2, 2021

raywin said:
UOTE="Andy Warren, post: 5148031, member: 138307"]Thanks for that. I hoping to get it on the road in a couple of weeks so once I'm happy with the way it runs I'll probably blank the EGR anyway as the inlet manifold is clean & I want to keep it that way.

It's a good idea, I took mine out, but decided to put it back as MOTs get tighter, I just blanked the flex from the exhaust manifold, almost impossible to see, and keeps all that muck out of the manifold.[/QUOTE]
Hi, can you buy a blanking plate for there or shall I just whittle one up from a piece of sheet steel ?

raywin · May 3, 2021

You can find them on e bay, or if you have the facilities knock one up it's quite a simple thing, be sure to use 3 or 4 mm steel, I put a thin one in first time and it burned throug, the studs in the manifold are notorious for shearing but you can mount the blank on the inlet to the exhaust gas cooler at the front of the engine.

Andy Warren · May 3, 2021

raywin said:
You can find them on e bay, or if you have the facilities knock one up it's quite a simple thing, be sure to use 3 or 4 mm steel, I put a thin one in first time and it burned throug, the studs in the manifold are notorious for shearing but you can mount the blank on the inlet to the exhaust gas cooler at the front of the engine.

Thanks I've get cracking on it . As I've just done drilled out 3manifold studs, 1 air con compressor bolt & 1 EGR flexi pipe bolt fitting a blank won't be a problem.
Do you leave all the vacuum pipes connected or blank those as well ?

sierrafery · May 3, 2021

Andy Warren said:
Do you leave all the vacuum pipes connected or blank those as well ?

Actually if you blank the vacuum pipes you dont need anything else, the blanking plate is needed if the valve is removed and changed with the bypass pipe

raywin · May 3, 2021

Andy Warren said:
Thanks I've get cracking on it . As I've just done drilled out 3manifold studs, 1 air con compressor bolt & 1 EGR flexi pipe bolt fitting a blank won't be a problem.
Do you leave all the vacuum pipes connected or blank those as well ? View attachment 237403

I put the vacuum pipes back, blanking then is fine if you do it very carefully, remember that the braking system uses the same system and if your blanking fails it will affect braking.
Taking that into consideration I put it "as built ". Which would avoid any difficult questions in the event of an accident.

Andy Warren · May 3, 2021

raywin said:
I put the vacuum pipes back, blanking then is fine if you do it very carefully, remember that the braking system uses the same system and if your blanking fails it will affect braking.
Taking that into consideration I put it "as built ". Which would avoid any difficult questions in the event of an accident.

Cheers, on that note I'll leave the vacuum side alone.
So I've been down the man cave & found a bit of 5mm steel plate & set about it. I had a spare EU3 EGR pipe to work with (my eng. is EU2). I'll clean & paint it tomorrow then fit it, happy days.

Andy Warren · May 3, 2021

sierrafery said:
Actually if you blank the vacuum pipes you dont need anything else, the blanking plate is needed if the valve is removed and changed with the bypass pipe

I've made a blank instead of blanking the vacuum pipes. Thanks again.

lynall · May 3, 2021

Always worth the effort of physically blanking them as when an egr fails open it can cause loads of issues.

sierrafery · May 3, 2021

Andy Warren said:
I've made a blank instead of blanking the vacuum pipes. Thanks again.

Sorry but it seems that you dont really understand how it works, if you just blank the exhaust but the vaccum is not blanked to the valve the EGR will kick in at a moment then the engine will stall cos when the valve opens to the exhaust it closes the air which means there wil be no air flow into the inlet so as long as the valve is still there connected the vacuum must be disabled as the valve to stay closed and in this case it lets only air into the inlet. That's why i said that as long as you dont replace the valve with the bypass pipe it's enough to blank te vacuum cos the exhaust is closed by the valve without vacuum. Putting a plate to the exhaust by keeping the valve functional will lead to running issues. If you dont want to blank the vacuum you can simply unplug the solenoid's electrical plug then the vacuum will stop there

Andy Warren · May 3, 2021

sierrafery said:
Sorry but it seems that you dont really understand how it works, if you just blank the exhaust but the vaccum is not blanked to the valve the EGR will kick in at a moment then the engine will stall cos when the valve opens to the exhaust it closes the air which means there wil be no air flow into the inlet so as long as the valve is still there connected the vacuum must be disabled as the valve to stay closed and in this case it lets only air into the inlet. That's why i said that as long as you dont replace the valve with the bypass pipe it's enough to blank te vacuum cos the exhaust is closed by the valve without vacuum. Putting a plate to the exhaust by keeping the valve functional will lead to running issues. If you dont want to blank the vacuum you can simply unplug the solenoid's electrical plug then the vacuum will stop there

Your right I didn't realise it worked like that

. I will get the vacuum blanked off as well

. Thanks again.

raywin · May 3, 2021

Mine is definitely blanked like that and runs fine.
I looked in the EGR valve when it was off and it just opens up a poppet type valve which allows the exhaust gas into the air intake stream, if it shut down the air intake when it operated then you would feed pure exhaust gas into the inlet manifold and the engine would shut down.
Look at the size of the EGR exhaust feed pipe it's way too small to feed the 2.5 ltr engine even if it was pure air being fed through it.

Follow this link and scroll down there are some good pictures which make it clear.

https://www.aulro.com/afvb/discovery-2-a/185928-cleaning-egr.html

sierrafery · May 3, 2021

Sorry, i misunderstood that it's Eu3 on which the air is restricted when the exhaust is opened...on Eu2 it might not be such issue

Andy Warren · May 3, 2021

raywin said:
Mine is definitely blanked like that and runs fine.
I looked in the EGR valve when it was off and it just opens up a poppet type valve which allows the exhaust gas into the air intake stream, if it shut down the air intake when it operated then you would feed pure exhaust gas into the inlet manifold and the engine would shut down.
Look at the size of the EGR exhaust feed pipe it's way too small to feed the 2.5 ltr engine even if it was pure air being fed through it.

Follow this link and scroll down there are some good pictures which make it clear.

https://www.aulro.com/afvb/discovery-2-a/185928-cleaning-egr.html

My EGR is as clean as the one in the link, as is the manifold, that's why I wanted to blank it off (I cleaned my FL1 manifold when I got it, (what a job) & quickly put a delete on that). So I should be ok leaving the vacuum pipe connected by the sounds of things.

Andy Warren · May 3, 2021

sierrafery said:
Sorry, i misunderstood that it's Eu3 on which the air is restricted when the exhaust is opened...on Eu2 it might not be such issue

No worries, I think at sometime in the past I'd told you it was EU3 but I was mistaken it's EU2 as it hasn't got an EGR cooler.

sierrafery · May 3, 2021

Andy Warren said:
No worries, I think at sometime in the past I'd told you it was EU3 but I was mistaken it's EU2 as it hasn't got an EGR cooler.

It happens, though i dont understand then why do you prefer to fit a blanking plate on the exhaust rather than blank the vacuum which seems easyer.

Andy Warren · May 3, 2021

sierrafery said:
It happens, though i dont understand then why do you prefer to fit a blanking plate on the exhaust rather than blank the vacuum which seems easyer.

Hi, I think I'd already started before I read your post

. As I haven't fitted the blank yet I could just blank the vacuum pipe still.

Disco 2 EGR Readings

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