Thread: D4 2.7L EGR and associated junk removal

My D3 has an egt post turbo and pre-cat which is quite useful. There was also post cat/pre DPF and a post DPF. The post DPF sensor went with the DPF and the pre-DPF turned out to be toast (which likely caused the issues I had with the DPF leading me to gas-axe it out).

The remaining post turbo egt sensor is handy when towing. I'm not really sure I'd get much use from individual per bank sensors over and above that.

Originally Posted by BradC

My D3 has an egt post turbo and pre-cat which is quite useful. There was also post cat/pre DPF and a post DPF. The post DPF sensor went with the DPF and the pre-DPF turned out to be toast (which likely caused the issues I had with the DPF leading me to gas-axe it out).

The remaining post turbo egt sensor is handy when towing. I'm not really sure I'd get much use from individual per bank sensors over and above that.

Fair comment re 2 sensors, but I'm a bit paranoid about EGTs, so looking for the best info outcome I can justify.
I'd prefer EGT sensors pre turbo/post exhaust manifold/s as they then I understand provide the highest reading/s, and I won't need to do any adjustments for actual higher temps in my head.

Just get a tdv6 EGR blanking kit DA1112 (Google that number to see it etc) and you can place a probe pre turbo but it will only be on 1 bank, and access to do so is a mission....

I don’t have any practical experience in the matter, but everything I’ve read indicates that the later model D3’s and D4’s with the 2.7 TDV6 require more than just blanking off/removing the EGR system - more being either the emulation route or ECU modifications to stop the system getting upset.

I used Bell Auto Service (BAS) to tune our MY12 D4 TDV6 via the IIDTool. I spoke to Pete Bell briefly regarding the EGR disable and he advised he can do it - would require an adjustment to the ECU tune (at an additional fee) and the fitting of the blanking kit (or alternatively removal of the parts). He doesn’t like doing it for road cards and recommends against it so that the vehicles are still MOT compliant (the inspections they have in the UK).

Originally Posted by twr7cx

I used Bell Auto Service (BAS) to tune our MY12 D4 TDV6 via the IIDTool. I spoke to Pete Bell briefly regarding the EGR disable and he advised he can do it - would require an adjustment to the ECU tune (at an additional fee) and the fitting of the blanking kit (or alternatively removal of the parts).

I used BAS patches for the DPF and EGR. It has caused an odd behaviour where the accelerator appears to "hang" for short periods after it is released (like when changing gears, you get off the throttle and when you put the clutch in it revs up rather than down). You get used to it and in an auto you probably wouldn't even notice it.

Subjectively there might be a bit less low end oomph but as I couldn't really do an immediate before and after it's hard to really say.

Next time I'm under the bonnet I'll try disconnecting the EGR valves electrical connectors and see if the system spits the dummy. I can see obvious advantages to removing the coolers and valves altogether.

D3 EGR Valve Removal Latest Options?
D3 EGR Valve Removal Latest Options?

See this post with discussion and schematics.

@discorevy has removed the coolers.

Originally Posted by PerthDisco

D3 EGR Valve Removal Latest Options?
D3 EGR Valve Removal Latest Options?

See this post with discussion and schematics.

@discorevy has removed the coolers.

Discorevy noted that

I left the coolers in place (no coolant or gases inside).

If I understood him properly, DazzaTD5 queried that if LR had gone to the trouble of fitting coolers, perhaps the coolers have a wider role than just cooling exhaust gases. Sounds like potentially a valid point and a possible justification for leaving them well alone?

Nope they cool the exhaust gas from a zillion degrees to just hot before re-entering the engine through the EGR.

They do assist in heating up the coolant which was my concern.

If blanked at manifold and coolant removed they are just ornaments at that stage in any case.