Thread: EGR blanking

If you blank 2.7s that are 06MY and earlier you will not have an issues.

If you blank a 2.7 that is 07MY (EU4) and later where the EGRs have failed you will get the EML light on but the engine does not go into limp mode. This is not because of any different gas flow through the engine but simply the ECU is not receiving the correct open/close signals from the EGRs and the fault comes up but engine performance is not restricted.

If the serviceable EGRs are connected to to wiring loom of a EU4 or later 2.7 that is blanked you will not get any faults or EML as the ECU is receiving the correct open/close signals from the EGRs. The EGRs act like emulators.

It is my car is the one referred to by Ean.

My EGRs failed 80,000km ago and I ordered new EGRs from the UK - if you shop around they are not all that expensive ($120 each LR new). I also bought a BAS blanking kit which I out on without changing the EGRs and tested a trial remap to remove the EGRs from the software but it was early days then and unlike now did not work.

So I was in the position of having to replace the EGRs - A procedure I did not fancy due to the PITA in removing etc. So thinking about it a bit more (and noting the EGRs on the engine were now blanked) I tried unplugging the old EGRs from the wiring loom and plugged in the new EGRs just sitting them on top of the engine cover. Cleared the codes and went for a drive - no EML and no codes after a 50km drive.

80,000km later I still have the old broken EGRs on the exhaust, the blanking plates in place, butterfly removed and the new EGRs mounted up in the ABS module space near the steering column - I just cut into the wiring loom near where the EGR connectors were and extended the loom - still no fault codes and no EML.

If I were to do it now I would probably blank and get the remap done as it now works. However it would still be cheaper to get new EGRs etc as I have done - if you shopped around for the EGRs but it would be a lot more mucking around.

So for later 2.7s - if you blank the engine will run OK but you will have the EML on without getting the patch done.

Garry

I read somewhere that the EGR blank should have a small central hole so the airflow continues and it doesn't throw a fault. Is that right?

Originally Posted by DiscoMick

I read somewhere that the EGR blank should have a small central hole so the airflow continues and it doesn't throw a fault. Is that right?

Cant see why , the idea is to get the gases to flow out the exhaust not into the engine bay .

Cheers Ean

Originally Posted by DiscoMick

I read somewhere that the EGR blank should have a small central hole so the airflow continues and it doesn't throw a fault. Is that right?

So that’s the idea of the restriction plates you can get. They reduce the size of the hole to only about 5mm. This allows some flow supposedly registering it working, but reduces the amount of crud. Not perfect by any means but better I guess.

Originally Posted by DiscoMick

I read somewhere that the EGR blank should have a small central hole so the airflow continues and it doesn't throw a fault. Is that right?

Maybe on other cars but not Discos etc - mine do not have any holes.

Why would you bother to block them AND apply the patch

The patch closes the system, and adjusts how it looks for air flow...

Originally Posted by Tombie

Why would you bother to block them AND apply the patch

Maybe the EGRs have already failed so are stuck open.

Originally Posted by garrycol

Maybe the EGRs have already failed so are stuck open.

Then I’d expect you’ll get an error patch or not, as the commander position of butterfly ‘closed’ won’t be attained and will cause it to flag this. I base this on the information that they don’t disable the system, but change the parameters such that it never meets the requirements to open.
And I may be wrong