200K M271 ERG Removal / Delete - Mercedes Benz SLK Forum

Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 08-11-2015
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200K M271 ERG Removal / Delete

Has anyone tried an ERG (exhaust return gas) blanking or removal on an M271 1.8 supercharged motor? What are the computer system management issues and can they be overcome. And, what about the vacuum hoses, plug them, or redirect them? I understand the emmission issues will effect many of your thoughts but is not an issue where I live. Look forward to your mechanical knowledge.
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#2 Old 09-14-2015
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ERG blocking plates made up and fitted. Working well, a small bit more go under the right foot, as supercharger now only pumping pure cold compressed fresh air and not half recycled Carbon-monoxide.
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#3 Old 09-14-2015
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Sounds interesting .

So , have you found any issues with the CPU management/fuel etc?

What sort of difference have you noted power wise ?

Do you have any pics to explain what work/parts are involved ?


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#4 Old 09-14-2015
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I too am interested in the details of this mod. Our direct port engines would seem to be at risk of carbon fouling at the intake valves. And yet EGR delete mods or Catch Cans seem to be surprisingly rare topics here. In fact I am genuinely surprised we don't hear of more carbon buildup problems among MB owners - per the forums lotsa BMW owners are plagued with this. Porsche too.

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#5 Old 09-15-2015
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Some pics would be nice and some experience about if any fault message came up?
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#6 Old 09-15-2015
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Happy to accommodate. I will get some pics taken and loaded soon. No engine light displayed and I have done both city driving and some foot down action to try to have the engine warning light to react . Power gain minimal but there is something there that wasn't there before. My guess would be 0.5 of a horsepower ( a spoofteenth), but better for the engine, and my future plans. What made me think of doing this was 4th he carbon in the intercooler pipe when I took it off. I just thought that the intercooler was no place to allow carbon to deposit.

Regards Greg Bee
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#7 Old 12-12-2015
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Originally Posted by Chuc View Post
... I will get some pics taken and loaded soon. ...
Please don't forget it
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#8 Old 02-04-2016
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I think there is a misunderstanding in this thread, m271 SLK engine does NOT have an EGR system. Only the CGI upgraded version does but it was not available on the SLK. Most probably you modified your secondary air injection system AIR which can not bring any improved performance by deleting it. The secondary air injection system role is to somewhat reduce pollution by introducing clean air into the exhaust until the cats and O2sensors (to be "politically correct" they are actually wideband sensors) gets hot enough to let the engine run the air-fuel mixture right from the emission standpoint. The secondary air injection is activated for a short period when the engine is warming up (usually no more than a minute) by a vacuum solenoid near the coils in our case. Assuming that your vacuum system and AIR are both good and not injecting air when it's not supposed to then you have no reason to mess around with the engine.
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#9 Old 03-23-2016
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Ok, here goes. Sorry I'm not one for sitting endless hours in front of a computer playing forum boffin, it's not for everyone.


First goal was to remove the manifold heat sheild.


Some of the photo's will look odd, and out of order to what I am saying, and what you are seeing, as I did the work and then took pictures.
"I hate getting my phone camera dirty".


So, to get the manifold heat sheild off I had to loosen and remove the bolts to the ERG valve body to make room for the heat sheild to come out. The bolt at the back of the heat sheild is bit of a bugga to get to, and don't drop it or you will spend most your time removing under-body plates to find it.
Attached Images
File Type: jpg 1-Merc A271 Exhaust with Heat Shield fitted.jpg (109.5 KB, 26 views)
File Type: jpg 2-Merc A271 Exhaust Heat Shield and ERG Valve on the Right.jpg (117.0 KB, 20 views)
File Type: jpg 3-Merc A271 Rear Manifold Sheild Bolt Tool Putting Back In-1.jpg (106.3 KB, 18 views)
File Type: jpg 4-Merc A271 Rear Manifold Sheild Bolt Tool Putting Back In-2.jpg (96.8 KB, 17 views)
File Type: jpg 5-Merc A271 ERG Valve with Black Blocking Plate Manifold Removed.jpg (115.2 KB, 24 views)
File Type: jpg 6-Merc A271 ERG Valve E10 Bolts.jpg (88.0 KB, 21 views)
File Type: jpg 7-Merc A271 Rear Manifold Sheild off.jpg (113.7 KB, 15 views)
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#10 Old 03-23-2016
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Next is to remove the ERG Metal Tube. Working under the manifold was not easy but using the feel with your fingers you will work it out. You get the advantage I didn't have, as my pictures ( this was at a later date ) that have the manifold removed. You should not remove the manifild to do this simple job.


Be careful once again not to drop a bolt nor the flange gasket.
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File Type: jpg 8-Merc A271 ERG Delivery Tube.jpg (78.3 KB, 17 views)
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#11 Old 03-23-2016
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Using the ERG Tube Flange Gasket, I made a cardboard template to make my two blanking plates from.


My level of accuracy was quite general, not to Mercedes engineering standard unfortunately.


You need to make two Flange Blanking Plates obviously, mine were made from 3 or 5 mm plate. Just enough to last the time and the exhaust being blocked not to burn through the plate. I covered them with black heat paint before installing them.
Attached Images
File Type: jpg 9-Merc A271 ERG Copy of ERG Gasket Cardboard Blank cutout-1.jpg (90.2 KB, 15 views)
File Type: jpg 10-Merc A271 ERG Copy of ERG Gasket Cardboard Blank cutout-2.jpg (95.1 KB, 15 views)
File Type: jpg 11-Merc A271 ERG Copy of ERG Gasket Cardboard Blank and Steel Plate-1.jpg (96.8 KB, 16 views)
File Type: jpg 12-Merc A271 ERG Copy of ERG Gasket Cardboard Blank and Steel Plate-2.jpg (99.6 KB, 13 views)
File Type: jpg 13-Merc A271 ERG Copy of ERG Gasket Cardboard Blank and Steel Plate-3.jpg (76.3 KB, 12 views)
File Type: jpg 14-Merc A271 Lower ERG Black Blocking Plate with Manifold Removed.jpg (70.7 KB, 18 views)
File Type: jpg 15-Merc A271 Lower ERG Black Blocking Plate.jpg (40.5 KB, 16 views)
File Type: jpg 16-Merc A271 ERG Valve with Black Blocking Plate.jpg (38.7 KB, 19 views)
File Type: jpg 17-Merc A271 ERG Valve Fitted Black Blocking Plate.jpg (41.8 KB, 18 views)
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#12 Old 03-23-2016
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Now reassemble the Manifold Heat Shield. You can't drive with this left off, as there is a plastic fuel delivery tube just above the manifold. Convenient place to have it, if you want a barbeque.


Remember that back bolt is a pig of a thing. I used a bendable clawed picker/finder tool to get the thread started, while I held the sheild in place with the bolt holes lined up, then went back to the socket wrench to tighten it up.


After that, close the bonnet and put the pedal to the metal.
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#13 Old 03-24-2016
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Thanks for the pics !

How long have you been driving the car like this, any check engine lights etc come up ?


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#14 Old 03-24-2016
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Car has been driven for approx 6 months with the blanking plates and two dealer services. No service or engine check lights incurred. Car is going hard with the Kleeman headers and supplied Kleeman euro 3 hi-flow catalytic converter with standard exhaust. I think it was an easy all positive thing to do.
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