Oily EGR C250td

[harri875]

Hi guys has anyone had a problem with oil leaking from the back of the exhaust gas recirculater unit. I disconnected the vacuum hose a few months ago as i was having a problem with jerky accelleration and a slight power surge when running at 1500 revs.This seems to have solved that problem but created another. Took the air intake ducts off and cleaned them as there was quite a lot of oil and gunge built up especially in the manifold.Is this normal.

 

[Shude]

This should probably have been posted in the Engine section, moving...

 

[jimmy]

Have a look at this: http://mbclub.co.uk/forums/showthread.php?t=2929

I cleaned my inlet manifold, intercooler and charge pipes.

I also disabled my EGR valve by blocking the vacuum pipe with a ball bearing. Don't simply disconnect the pipe as it will register a fault in the ECU.

Because the EGR is not working, the oil settles in the EGR valve and leaks, mine did the same so I removed it, cleaned it and coated the gasket and surfaces with grease to make a better seal. I also remove the ball bearing every now and then so that the EGR valve can operate and removes the oil.

 

[harri875]

Thanks for that Jimmy, will give it a go. Any advice on removing the EGR?

 

[teky]

http://images.google.com/images?q=egr&hl=en&lr=&ie=UTF-8&sa=N&tab=wi
blanking plate required and must be done when engine is stone cold not even turned on by ignition key

 

[Dieselman]

http://images.google.com/images?q=egr&hl=en&lr=&ie=UTF-8&sa=N&tab=wi
blanking plate required and must be done when engine is stone cold not even turned on by ignition key

Can you explain this further?

 

[teky]

you can blank the egr valve which is a cause of many problems and it dosnt effect the immisions for the mot also gives better fuel consumption/power, it must be done when the engine is stone cold dont even turn the ignition key that turns the system on and you dont want that, simply unod the egr valve and fit the blanking plate you will be glad you did it

 

[teky]

ps:- you wont get a fault code or the mil light on if you do it the way i said, the egr system is simply disabled due to there being no gases past through it

 

[harri875]

Sounds like a good idea.Have taken egr off and cleaned it, know how it works and now have a better idea of what is going on in the engine.Think a blanking plate is the answer.

 

[jimmy]

Am I right in thinking that the blanking plate sits between the EGR valve and the EGR housing or does it replace the EGR valve completely? If it replaces the valve then what do you do with the pipe from the exhaust to the EGR?

Is this blanking plate an MB part or a homemade job? Have you got a part number?

 

[Dieselman]

you can blank the egr valve which is a cause of many problems and it dosnt effect the immisions for the mot also gives better fuel consumption/power, it must be done when the engine is stone cold dont even turn the ignition key that turns the system on and you dont want that, simply unod the egr valve and fit the blanking plate you will be glad you did it

I understand this but with the EGR vacuum pipe blocked off so the valve is disabled, but no vacuum loss, the MAF picks up the EGR isnt allowing gas into the manifold and threows the ECU into limp home after xx many attempts. This is on a 300 turbo.

I don't see how a blanking plate would achieve a different result and what's the relevance of performing the mod when cold.

Also the 250 td doesn't pick up an error for the EGR anyway as it has no MAF sensor so blocking the vac ppipe achieves the same result.

I'm not meaning to have a go, just a bit confused.

 

[teky]

the plate sits between the egr valve and engine you can remove the valve completly but why bother the plate block it of anyway then the mot people cant tell you blanked it nudge nudge wink wink

 

[Dieselman]

ps:- you wont get a fault code or the mil light on if you do it the way i said, the egr system is simply disabled due to there being no gases past through it

I think I may be answering my question from my previous post here.

Are you referring to the EGR valves that have their operation checked at start up, by opening and making microswitches? I have been referring to valves that are detected by the MAF picking up the different air volumes during operation.

 

[teky]

yes the egr is linked to many of the systems on the engine but all it does is recirculate unburnt gasses back to the intake which causes cokeing of the iacv and other things so all you are doing is switching it off the the other parts of the system cant detect it there for it dosnt exsist when blanked, check the link out it explains a lot

 

[jimmy]

So is there a MB part number for the blanking plate?

That link does not link to anything for me, just a load of images. What article in specific are you referring to?

I can understand how a blanking plate would work on my C250TD and may well make one myself, just a piece of metal with two holes and a bit of sealant, I don't understand why it has to be stone cold either, obviously you would not fit it to a hot engine but can't see what difference it would make.

 

[teky]

the link is there to show you what to do "just a piece of metal with two holes and a bit of sealant" and now you have the idea, you cant buy it from mb so it has no part number just make one up