[torqueisking]

Yet another EGR delete thread but I just had to share this one as it works really well and can be easily reversed for those of us in emission testing regions.

Credit for this discovery goes to TDIwyse who mentioned the effect of no EGR valve feedback in another thread (searched but couldn't find it) but didn't include how to implement the mod in that thread ( apologies if implementation was explained in another thread and I missed it ).

***Update 15May19: This mod has been successfully tested on the E9x platform. Tests by xpro indicated that is it NOT a safe mod for the F30 platform.

I initially blocked my EGR at the EGR valve body with a copper disc. While it worked, I noticed a mileage decrease, frequent DPF regens and multiple codes thrown ( 45B7 , 4862 , 4B82 ).

Electrially disconnecting the EGR valve entirely results in limp home mode BUT electrically disconnecting the feedback sensor (hall effect sensor I believe) implements the effect TDIwyse discovered.

EGR utilization is now always zero and only a single code is thrown ( 4CAE ). Mileage increased from 9.2l/100km to 8.4l/100km (dash reading) or about 100km more per tank. That's with a 70/30% highway/city driving ratio and AC usually on. These results are from my X5 35D which I drive like a normal human being. The 335D is WOT every chance I get

Instructions

Disconnect the connector from the EGR valve motor.



There is a pink plastic terminal restraint in the connector that needs to be shifted laterally towards pin #1 of the connector.

You can just barely see it in the photo below. It's in the locked position. I used the metal pick in the photo to slide it aside. This requires very little force.

With the pink terminal restraint unlocked, partially unbend a paperclip and fully insert the wire into the SMALL hole beside the pin #5 terminal. Now gently pull the wire (black) and terminal out from the back of the connector.

Slide the pink terminal restraint back into the locked position after removing the terminal or it won't go back into the EGR valve motor.

Insert the connector back into the EGR motor.



That's it. The EGR valve will now never open. Reverse these instructions if you're going in for an emission test but do it well in advance to allow time for the DDE monitors to become "ready".

While this is effective as an EGR delete, I still recommend removal of the EGR cooler with blocking at the exhaust manifold and the coolant bypass. I've had two of these EGR coolers crack. They are failure prone and a reliability concern.

[Kyle335D]

Originally Posted by torqueisking

Yet another EGR delete thread but I just had to share this one as it works really well and can be easily reversed for those of us in emission testing regions.

Credit for this discovery goes to TDIwyse who mentioned the effect of no EGR valve feedback in another thread (searched but couldn't find it) but didn't include how to implement the mod in that thread ( apologies if implementation was explained in another thread and I missed it ).

I initially blocked my EGR at the EGR valve body with a copper disc. While it worked, I noticed a mileage decrease, frequent DPF regens and multiple codes thrown ( 45B7 , 4862 , 4B82 ).

Electrially disconnecting the EGR valve entirely results in limp home mode BUT electrically disconnecting the feedback sensor (hall effect sensor I believe) implements the effect TDIwyse discovered.

EGR utilization is now always zero and only a single code is thrown ( 4CAE ). Mileage increased from 9.2l/100km to 8.4l/100km (dash reading) or about 100km more per tank. That's with a 70/30% highway/city driving ratio and AC usually on. These results are from my X5 35D which I drive like a normal human being. The 335D is WOT every chance I get

Instructions

Disconnect the connector from the EGR valve motor.


Partially unbend a paperclip and fully insert the wire into the SMALL hole beside the pin #5 terminal. Now gently pull the wire (black) and terminal out from the back of the connector. Insert the connector back into the EGR motor.



That's it. The EGR valve will now never open. Reverse these instructions if you're going in for an emission test but do it well in advance to allow time for the DDE monitors to become "ready".

While this is effective as an EGR delete, I still recommend removal of the EGR cooler with blocking at the exhaust manifold and the coolant bypass. I've had two of these EGR coolers crack. They are failure prone and a reliability concern.

Do you believe using this method will increase the likelihood of the EGR to crack?

[335stoner]

i think you are thinking of the EGR cooler...

[rotatool]

Looks like a nice find. Does this mod cause more regens and does the code 4CAE cause the check engine light to come on?

[Len_Beach]

Could you use some sort of resistor to remove the fault code?

[Hoooper]

Is this verified by looking at the egr utilization commanded by the dde and seeing that the dde is commanding 0?

[torqueisking]

Originally Posted by Kyle335D

Do you believe using this method will increase the likelihood of the EGR to crack?

Both of my EGR coolers cracked without any EGR customization. The EGR isn't active under high load/ high exhaust temp conditions. While the mod would increase the EGR cooler temp at lower loads, the temps would still be lower than a no EGR-delete engine under high load.

Bottom line, it shouldn't increase the maximum temp the EGR cooler is exposed to and not make it any more prone to crack.

[torqueisking]

Originally Posted by rotatool

Looks like a nice find. Does this mod cause more regens and does the code 4CAE cause the check engine light to come on?

Less regens than mechanically blocking the EGR flow and based on my visibility using Torque, the same as a functional EGR system.

4CAE code illuminates the engine check light as most drive-train malfunction codes do I believe.

[torqueisking]

Originally Posted by Len_Beach

Could you use some sort of resistor to remove the fault code?

Unfortunately not. If you have no codes, you will have EGR utilization.

[torqueisking]

Originally Posted by Hoooper

Is this verified by looking at the egr utilization commanded by the dde and seeing that the dde is commanding 0?

Yes. EGR utilization % always reads zero with this mod as confirmed by the Torque app. Before applying this mod, the reading range was 0 to 100%.

[torqueisking]

Sorry guys. I forgot one important detail (actually did this mod many weeks ago ).

There is a pink plastic terminal restraint that needs to be shifted laterally towards pin #1 of the connector.

You can just barely see it in the second photo. It's in the locked position. I used the metal pick in the photo to slide it aside. This requires very little force. Slide it back into the locked position after removing the terminal or it won't go back into the EGR valve motor.

[OmahaDZL]

Originally Posted by torqueisking

Sorry guys. I forgot one important detail (actually did this mod many weeks ago ).

There is a pink plastic terminal restraint that needs to be shifted laterally towards pin #1 of the connector.

You can just barely see it in the second photo. It's in the locked position. I used the metal pick in the photo to slide it aside. This requires very little force. Slide it back into the locked position after removing the terminal or it won't go back into the EGR valve motor.

This is a SUPER mod and one that our friends in CA should all be doing. Thank you for finding TDIwyse 's comment/thread and documenting it....this group has come so far from a few peoples work and genius....

a suggestion, go back and edit your original post to include the pink clip, just to keep all the instructions in one place...

[torqueisking]

Originally Posted by OmahaDZL

This is a SUPER mod and one that our friends in CA should all be doing. Thank you for finding TDIwyse 's comment/thread and documenting it....this group has come so far from a few peoples work and genius....

a suggestion, go back and edit your original post to include the pink clip, just to keep all the instructions in one place...

great idea... done.

[torqueisking]

With a 2hr road trip last week (A/C operating), my average mileage is now 7.6L/100km (about 31 mpg US) and I'm over 900KM with a little less than a 1/4 tank left.

This is definitely better mileage than with the EGR active.

[robnitro]

Originally Posted by torqueisking

Both of my EGR coolers cracked without any EGR customization. The EGR isn't active under high load/ high exhaust temp conditions. While the mod would increase the EGR cooler temp at lower loads, the temps would still be lower than a no EGR-delete engine under high load.

Bottom line, it shouldn't increase the maximum temp the EGR cooler is exposed to and not make it any more prone to crack.

Without egr flowing gas, the temperature would always be cooler. Static gas sitting there would lose its heat.

With the coolant lines still there the static gas inside the cooler and pipe would be close to coolant temperature.

[bayerischer]

hey i am not sure, if i understand what is the procieger. what is the paper clip? do u insert it into that one slot there on the side, so basically you going to cut the current in that one whole right? or? i don't even know what is a paper clip

[335dwanted]

Originally Posted by bayerischer

hey i am not sure, if i understand what is the procieger. what is the paper clip? do u insert it into that one slot there on the side, so basically you going to cut the current in that one whole right? or? i don't even know what is a paper clip

[bayerischer]

ok that's what i thought, and so u gonna insert it there why? i thought u wanna block that slot, and not insert electrical current carrier

[OmahaDZL]

Originally Posted by bayerischer

ok that's what i thought, and so u gonna insert it there why? i thought u wanna block that slot, and not insert electrical current carrier

I thought this might happen. torqueisking , can you make a quick video howto and load it to youtube? and then link it here?

[OmahaDZL]

Originally Posted by bayerischer

ok that's what i thought, and so u gonna insert it there why? i thought u wanna block that slot, and not insert electrical current carrier

The way Im understanding it is that once you slide the little lever, you can push that connection out of the plastic plug entirely with said paperclip....

[Torqu3]

Originally Posted by OmahaDZL

The way Im understanding it is that once you slide the little lever, you can push that connection out of the plastic plug entirely with said paperclip....

Just reread the thread. That's EXACTLY what you're doing. The paper clip doesn't just stay in there. It's used to remove that connector from the plug.

[flynryan]

so you will get a check engine light??????? Thats the only thing that is holding me back.