Semikolon

Hi

After cleaning my inlet manifold and EGR-valve I wanted to get rid of EGR-functionality. Easier said than done.. By disconnecting the vacuumline and sealing the exhaust gas pipe the engine goes limp.

Is there another way to get rid of this ****ty exhaust gas recirculation? When driving without the EGR-valve connected I get better MPG (even when the car is not in limp mode) and less black exhaust, so I don't want it...

The engine is a 220CDI, but it's the same for all diesels with EGR-valve...


Thank you

Hirnbeiss

Does it go into limp mode if you leave the vacuum line hooked up and just seal the exhaust line?

ohlord

the old ball bearing trick?

dgiturbo

Those EGR valves on the CDI's usually have a sensor that is tied into the ECU. Once it "sees" a disconnect, or if the valve doesn't open as designed, it will put the motor in limp home.
I guess the way the other replies claimed might be the way to go?

Semikolon

it goes limp by sealing the exhaust yes.


what is the ball bearing trick?

Dan Wang

I've been looking into the same thing. Have you tried using a block off plate? I'm trying to find a EGR simulator but I cant seem to find one specifically for the MB.

Semikolon

as stated earlier, yes I have tried blocking the exhaust, which makes the engine go into limp mode because it doesn't get the amount of air it thinks it should.

Semikolon

The problem on the engine in question (220CDI/611.961) is that the EGR-valve is vacuum controlled and there are no sensors on it. The reason why the engine goes limp is because it doesn't get the right amount of air and the ECU thinks it's something wrong (or it understands I have done something illegal with the EGR).

So there are two theoretical solutions. Get the extra required air from elsewhere, or reprogram the ECU. An electronic EGR-simulator would not work.

So that leaves us to the first solution, get the extra required air from elsewhere.... How do we do this? By replacing the exhaust on the valve with an airfilter to suck clean air would not work because of the turbo, which will just press air out of that filter instead of the engine sucking air through the filter (I think)

lynall

I reckon it knows the egr has a problem because when it tells the egr valve to open the inlet air temp/boost sensor does not see a rise in temperature in the inlet manifold.

Sounds logical?.

Your valve filter idea would not work.



Lynall

Hirnbeiss

No one in the US has a 220 Diesel, but I believe the M112/M113 operate with EGR valve position sensors (switch E 28/3). That would indicate that leaving the vacuum line hooked up to move the valve will still trigger a correct position signal for the EGR valve.
Plugging the exhaust line might then trigger a mixture-related check-engine light (a la the M104's of old), however.

Semikolon

I think both those sensors are placed before the valve, on a tube leading from the intercooler.

Semikolon

There are no sensors on the valve itself, only vacuum. So the reason why it goes into limp must be from one or more sensors inside the engine as there are no sensors between the valve and the inlet ports on the engine.

This will be the exact same for 270CDI (OM612.961) and 320CDI (OM613.961), I believe you have the 320CDI over in us?


I don't get a check engine light, or engine warning message in assyst, it just loses its power without any notice.

Hirnbeiss

The 320CDI came out in 05 on the W211, but it looks like DGITURBO has one in his ML. If it's not a valve position switch, can it be something with the vacuum transducer? Did you read out the code that caused it to into limp? Maybe the mixture is just way off for the throttle/rpm combo.

Most people advise against removing the EGR these days. Since it is usually closed at WOT and idle anyway, where's the big performance gain?

Semikolon

There's no performance gain, but the reason why I want it away is that the car runs smoother and uses less fuel when it's disconnected. Also there are no black smoke at all when disconnected. Now after a few weeks with full EGR pass through the car smokes so much that sometimes I can hardly see what's behind me.


But I think I have a solution...

I will have to modify the inlet pipe to the turbo with a new small intake that doesn't pass the MAF. This new inlet will have a valve controlled by the same controller that controls the EGR-valve. This way the engine will get more air than the MAF reports when the EGR-valve is supposed to be open.

EdzBenz

Please post a report of what you are attempting with the new inlet. I'd really like to see some pictures and a report of how it went. I took off my intake manifold last week and it was really dirty with soot and want my EGR disabled.

Semikolon

I'll update you on the situation if I decide to carry out this operation.

EdzBenz

Great. Thanks. I look forward to it.

W210MB

I need help please.

Hello.

I have problems with the oil leak in the hose.How can come oil leak?Maybe from EGR or intercooler? But the flow of oil goes up to turbo Charger! Where is the problem here?
How come oil leak?Thanks.

My car is:MB 220CDI, w210. 2001 year.

giuseppesalvato

there is a solution using a couple of resistors and a diode wired into a circuit to fool the ecu into thinking the valve is operating. I believe a DIY has been put up to explain the method.

W210MB

Could you please be more clear on this explanation.Which Resistore, where lies resistori?Can you tell me where is the ECU in Mercedes?

giuseppesalvato

Look at the DIY written by Images on the 11-5-2012.

W210MB

Look at the DIY written by Images on the 11-5-2012.Where is the Image ?Can you help me to find it ?Please. <TABLE style="BORDER-TOP-WIDTH: 0px" class=tborder border=0 cellSpacing=1 cellPadding=4 width="100%" align=center><TBODY><TR title="Post 5433642" vAlign=top><TD class=alt2 width=125 align=center>giuseppesalvato</TD><TD class=alt1>Look at the DIY written by Images on the 11-5-2012. </TD></TR><TR><TD class=thead colSpan=2>Yesterday 03:41 PM</TD></TR></TBODY></TABLE><TABLE style="BORDER-TOP-WIDTH: 0px" class=tborder border=0 cellSpacing=1 cellPadding=4 width="100%" align=center><TBODY><TR title="Post 5433642" vAlign=top><TD class=alt2 width=125 align=center>giuseppesalvato</TD><TD class=alt1>Look at the DIY written by Images on the 11-5-2012. </TD></TR><TR><TD class=thead colSpan=2>Yesterday 03:41 PM</TD></TR></TBODY></TABLE>

toby1

This may help: http://forums.mercedesclub.org.uk/sh...ad.php?t=68928

W210MB

Toby1, thank you very much.I will try.Thanks a lot.

nsolot

Is there a DIY to clean the EGR valve?

I've searched & searched, but can't locate one.

TIA