406oc.co.uk

Hi guys,

Is it possible to install an EGR blanking plate without remapping the ECU? I'll be getting it remapped in a few months time, but would like the benefits of an EGR delete beforehand. Will the ECU have a hissy fit and put me in limp mode?

Many thanks

Benjamin

Benjamin,

I believe the ECU will register a fault as the air flow won't match the expected values but doesn't actually throw up the EML or limp mode in the short term, what the long term effects are I have no idea.

This is correct: fault but no EML or limp mode.

if you plug the vac line to the egr there will be no fault registered if you unplug the vac valve on the bulk head there will be a fault registered

I'm not sure that's true.
I believe the fault arises because the MAF value is higher than expected when exhaust gas is supposed to be being recycled.

My 406 had an EGR map on it - even though it was blanked and it never threw a fault, even after a year....

I understand what RWB is saying, the engine is sucking all the air past the MAF, even though the ECU thinks the EGR is open so some of the air flow should be diverted and sucked past the EGR.

I'll be blanking the replacement car before I get it mapped, just to eliminate some issues.

rwbs car is a newer 707 or sum thing like that so is more sensitive to things being blocked and unpluged the 406 on the other had is quit basic in its computerization and can't tell if the egrs working corectley or not just if the electrovalve is plugged in and that is giving the correct feed back

Thanks for all the replies I'm not hugely educated on diesel engines in general (more used to petrol ones), but I'm learning! So, if I were to just blank off the EGR tomorrow, are there any lines/electrical connectors I'd need to disconnect/plug up? Or is it simply a case of putting the blanking plate I got off eBay into the EGR valve, and putting it back together again? Also, will a fault be recorded due to the greater volume of air passing the MAF sensor? And my final question is will the engine be down on power/torque/throttle response due to this?

Thanks for your help and patience!

Benjamin

Ben,

I recently did this with mine - I fitted the egr blank, left the electrovalve connected and didn't change the software. I disconnected/plugged the vacuum supply to the electrovalve, but this was more to eliminate possible vacuum leaks than any need to do so.

The car ran fine - no warning lights, BUT when I checked with the diagnostic computer it have logged a fault, "air flow higher than expected". While this did not cause any outward problems, you have to wonder if it would have done so in time. No big deal for me, since I could simply reset it if necessary, but I decided to download a no-egr map, since I had one available.

Blanking the egr alone gave me an improvement in driveability and about 2 mpg more, installing a no-egr file gave me at least the same benefit again.

My story is buried in this post:viewtopic.php?f=1&t=21954

Doggy wrote:Ben,

I recently did this with mine - I fitted the egr blank, left the electrovalve connected and didn't change the software. I disconnected/plugged the vacuum supply to the electrovalve, but this was more to eliminate possible vacuum leaks than any need to do so.

The car ran fine - no warning lights, BUT when I checked with the diagnostic computer it have logged a fault, "air flow higher than expected". While this did not cause any outward problems, you have to wonder if it would have done so in time. No big deal for me, since I could simply reset it if necessary, but I decided to download a no-egr map, since I had one available.

Blanking the egr alone gave me an improvement in driveability and about 2 mpg more, installing a no-egr file gave me at least the same benefit again.

My story is buried in this post:viewtopic.php?f=1&t=21954

I really like the idea of getting rid of the EGR, but would hate to damage the engine by running it without the no-egr MAP. Why would it cause an issue?

I'm not suggesting it would damage the engine, but it might eventually cause you a warning light / limp mode situation.

No doubt others will tell you their's have been OK for years. I am just trying to give you the full picture.

Doggy wrote:I'm not suggesting it would damage the engine, but it might eventually cause you a warning light / limp mode situation.

No doubt others will tell you their's have been OK for years. I am just trying to give you the full picture.

Oh I understand now. Surely the elevated air flow code would not cause limp mode randomly? I don't mind having a dormant code, but cant see it randomly jumping out several months down the line and throwing the car into limp mode?

Thanks for your help!

Anyone who has run an EGR blanking plate without a non-EGR map, how have your experiences been?

Also, which electrovalve is it for the EGR? Or would I be better off blanking the vacuum line on the EGR itself?

Sorry for all the questions!

I believe your engine will have 2 electro valves mounted on the bulkhead, standing at the front of the car the left hand one being turbo, the right-hand being EGR...but.....
As you'll be installing a blanking plate the simplest and guaranteed way to identify the EGR electro valve is to remove the turbo pipe and follow the vac pipe from the EGR back to the electro valves.
To eliminate future vac leaks I removed the vac pipe completely and blanked it prior to the electro valve but left the electrical connector plugged in.

blue plug is the best way to identify the egr electro valve