Disabling EGR

Naraic

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So I went to do the mod to-day, but mu ECU is a little different from DM's. Where do I go now?
 

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dieselman

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I think your ECU connections will be the same as Oilgle's ML270, but the easiest way is to meter backwards from the MAF and EGR transducer, using continuity and DC voltage check.

Disconnect the MAF, EGR transducer and ECU plugs then find the appropriate wires.

It's difficult to describe but easy in reality.

Looking back in the thread shows the 270 connections to be as below. the 320 may well be the same, but will need checking before committing.

The wire from MAF pin 5 to the ECU Pin 24 plug 2 is Brown/White.

The return wire from the Vacuum Transducer to ECU goes to Plug 3 pin 50 is Grey/Black.

The 12V Red/Grey from ECU Pin 37 plug 3.
 

Naraic

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Thanks DM. I'll have a look.
 

oigle

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I think your ECU connections will be the same as Oilgle's ML270, but the easiest way is to meter backwards from the MAF and EGR transducer, using continuity and DC voltage check.

Disconnect the MAF, EGR transducer and ECU plugs then find the appropriate wires.

It's difficult to describe but easy in reality.

Looking back in the thread shows the 270 connections to be as below. the 320 may well be the same, but will need checking before committing.

The wire from MAF pin 5 to the ECU Pin 24 plug 2 is Brown/White.

The return wire from the Vacuum Transducer to ECU goes to Plug 3 pin 50 is Grey/Black.

The 12V Red/Grey from ECU Pin 37 plug 3.

Please - everyone doing this mod. DON'T take wire colours for granted. All models are different. Do as dieselman and I suggested some time back and locate the appropriate wire at the maf using a simple voltage meter. Look for the wire at the maf that indicates a voltage change in the range of 2 to 4 volts approx when the engine is run from idle up through the rev range. When you have located the wire, note the colours and find the same wire near the ecu. The 12 volt power source at the ecu is easy to find, once again with a meter, and the wire at the transducer is also simple to locate, once again note the colour at the unit and find it again near the ecu.
This is the only failsafe procedure
 

soup nazi

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What would be the ramifications if one of the resistors or the diode should fail? Is there anything that can be done to fail-safe the circuit?

I have done mine and it appears to be working, photos to follow when I work it out.
SN
 
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supermed41

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know how

i see an ebay opportunity for someone here! make up the resistor/diode mod with wires and instructions and hawk it on ebay. parts cost = pennies, could sell for £10-£20.

I wish i have the tech know how, i could make lot of money out of this, but for me who is just a Mercedes owner, i think this is the END of the road.

I wish Member Oigle is in the UK, i'm sure he'll help, but for UK members i'm not sure, all in all i must say the site is for the tech guys and not for owners.

Thank you to everyone
 
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dieselman

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I wish i have the tech know how, i could make lot of money out of this, but for me who is just a Mercedes owner, i think this is the END of the road.

I wish Member Oigle is in the UK, i'm sure he'll help, but for UK members i'm not sure, all in all i must say the site is for the tech guys and not for owners.

Thank you to everyone
Do you think Oligle would drive 100 or 200 miles to fit a few resistors for you?

Sorry to sound terse, but if you aren't prepared to do anything to help yourself, then you will be disappointed by not finding help.

This is a web forum and the country is a big place.
 

turbopete

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I wish i have the tech know how, i could make lot of money out of this, but for me who is just a Mercedes owner, i think this is the END of the road.

I wish Member Oigle is in the UK, i'm sure he'll help, but for UK members i'm not sure, all in all i must say the site is for the tech guys and not for owners.

Thank you to everyone

many on here arent tech guys. its often the tech's we get our knowledge from. when i joined i was overwhelmed by it all until i got used to the terminology used here. for instance a MAF was jargon to me because id always known it as an air flow meter. if i mentioned a HEGO sensor, im sure most people here wouldnt know what i was talking about. call it a lambda probe/sensor and it makes sense to people here
 

oigle

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I wish i have the tech know how, i could make lot of money out of this, but for me who is just a Mercedes owner, i think this is the END of the road.

I wish Member Oigle is in the UK, i'm sure he'll help, but for UK members i'm not sure, all in all i must say the site is for the tech guys and not for owners.

Thank you to everyone

I appreciate the vote, supermedi, and I would help if I could. However, I am the first to acknowledge the help I have received from the techies on this forum. I know I have contributed but in this case, with the shunt, I was getting nowhere until dieselman contributed his expertise.
I understand your frustration but I guess you have a choice - either have a go yourself or take it to one of the techies who, I am sure, will do it for you at a reasonable cost. I paid my hometown car electrician to do mine after paying another mech., with my help, to remove and clean my manifold and EGR. Better that than asking a non-techie member to help. Most have little in the way of equipment and know-how and don't want to be responsible for the appearance or result of the end job. A techie is equipped and insured etc if something were to go wrong.
Just see if you can find a professional guy to do it for you - how far is it to your nearest techie that contributes on this forum? The shunt job will only take him about an hour at the most to do.
Cheers mate.
 

soup nazi

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This mod is nat that hard, all the hard work has been done for you by dieselman and the others on this thread. I'm the first to admit when I took a look at the area where the mod is fitted I took a step back, there are way too many wires for me I thought. But I did as much research as I could, undertook all advice from dieselman in that I checked out the wires to confirm I had the correct ones and waited until I was 100% convinced I could construct and fit the shunt. Take your time, buy yourself a cheap multimeter, enlist the help of a friend if you don't know how to use it and go forth old son. The thing has been doing what it does for many years now so some more time while you get it sorted won't do any harm. Just wait until you are sure you have it right.

For me I will have a go at just about anything mechanical but I generally draw the line at electrics of this nature, I would normally leave it to the cone-heads, but I could not find a cone-head willing to do the job!
SN

Edit: By the way chaps, I believe I mentioned earlier on this thread that I had an unstable idle problem. That went when I fitted the shunt! Dead stable now. I can only summize that the EGR valve may have been sticking in various positions causing confusing returns to the ECU????
 
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supermed41

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Do you think Oligle would drive 100 or 200 miles to fit a few resistors for you?

Sorry to sound terse, but if you aren't prepared to do anything to help yourself, then you will be disappointed by not finding help.

This is a web forum and the country is a big place.

I can understand, please don't be angry with me, i only mention Oligle because he advice if i can drive to one of you guys so i don't mess with the ECU, and i've tried contacting few people in my area but none knows how to do it.

I'm not expecting anyone to drive 100/200 or more miles to come and fit few resistors for me, i'm ready to go to anyone and pay to get it done.

Dieselman, you have done a great job, without you i woud never know about this so don't be upset with me, anytime i lift the bonnet i can see this thick black tar and when i look around the ML, everything is neat and seal, don't know where the ECU is, and this is my first Mercedes that's why i'm nervous.

I hope members will understand my disappointment and the reason why i need help so badly.

Thank you all
 

jks001

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EGR mod

Can I do the same on Hyundai tucson? EGR solenoid valve has 2 wires, one is 12V and second is egr control from ECM
Please help
 

toby1

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supermed41, I'm not a techy so I've asked a friend to wire it up for me.

If you take all the pics and docs from the posts and related threads, I'm sure someone can wire it up for you.

There's an MB specialist in Reading i believe - maybe he can do it?
 

Alex Crow

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i have ordered 100x 1Kohm .25W + 100x 470ohm .25W + 20x 4004 diodes. total including delivery is around £3.50 as i have got a w210 E320 cdi in next week for the mod. it should be fine as it is cdi2 like the 270ML and shares air mass sensor and control logic - will let you know how well it works with live data check.
 
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dieselman

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I can understand, please don't be angry with me,
I'm not angry with you, but this is a remote forum so we can only offer remote assistance.

You mention you don't know where the ECU is.

It's mounted in the black plastic box behind the firewall in front of the windscreen scuttle.

How can you help us to help yourself... ;)

Have a look for the MAF sensor, which is attached to the air filter box and have a look for the ECU and EGR valve transducer.
If you can't find them take some pictures of the engine bay and we can point them out.
After that it's a case of finding the correct connections and wires, which isn't difficult with a bit of guidance.

We can do this on a one step at a time basis, but only if you participate.. :)
 

oigle

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I can understand, please don't be angry with me, i only mention Oligle because he advice if i can drive to one of you guys so i don't mess with the ECU, and i've tried contacting few people in my area but none knows how to do it.

I'm not expecting anyone to drive 100/200 or more miles to come and fit few resistors for me, i'm ready to go to anyone and pay to get it done.

Dieselman, you have done a great job, without you i woud never know about this so don't be upset with me, anytime i lift the bonnet i can see this thick black tar and when i look around the ML, everything is neat and seal, don't know where the ECU is, and this is my first Mercedes that's why i'm nervous.

I hope members will understand my disappointment and the reason why i need help so badly.

Thank you all

I am a bit concerned about the above underlined statement, mate. The issues with the EGR don't manifest themselves externally. Perhaps you have a problem with injector/s leaking??
Maybe another good reason to make an appointment with a good indie and get it looked at.
 
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dieselman

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I am a bit concerned about the above underlined statement, mate. The issues with the EGR don't manifest themselves externally. Perhaps you have a problem with injector/s leaking??
Maybe another good reason to make an appointment with a good indie and get it looked at.
Yep. Definitely injector blow-by.
 

supermed41

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Yep. Definitely injector blow-by.

Injector was done 6 months ago, when stading in front of the ML on my right hand side there is a hose and black oil coming out of it and just under the hose there is round thing like Exhaust box and is full of thick black oil by the inlet manifold area.

I took the car to my local indie and was connected to PC, MAF was replace and car is driving fine, been to Sheffield and yesterday to Bournemouth day out with kids and Mrs lol.

I'll have a good look around engine tomorrow and take some photo and post back.

Thank you DIESELMAN and everyone for your help.:):):)
 
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oigle

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Injector was done 6 months ago, when stading in front of the ML on my right hand side there is a hose and black oil coming out of it and just under the hose there is round thing like Exhaust box and is full of thick black oil by the inlet manifold area.

My 2003 update is obviously a little different from yours. Under my large hose, I have the alternator and to one side, the oil filter housing, so I'm guessing a bit.
However, it appears, from what you say, that an oily mess is leaking from the large hose where it joins the inlet manifold. This sounds like the gunge that we have been referring to that chokes up the manifold and egr valve. To have it leaking from that hose, however, would indicate you have an air leak from the hose. This could be from around the clamp or possibly from a split in the hose. As this is under boost pressure, it should be attended to.
You need to have your manifold and egr removed and cleaned out properly, the swirl flaps and motor checked and the shunt done to stop it gungeing up again.
 

jks001

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EGR and MOF mod

I have made that circuit on my Hyundai Tuscon CRDI, and it's ok for now, but I'm not sure about MOF signal wire. what should be the voltage? on the white wire it gives 1.5V- 3.9V depending on rpm given. it that correct? Would you please explain to me how does this mod work? when mof gives 3.5V thought the circuit ECM thinks that EGR is working?

Thanks
 

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