How do you disable the EGR on E300TD?

[230K]

Hi

Can anyone tell me how to disable the EGR on a 98 E300TD. Just had the intake manifold off to change the glow plugs and it is in a terrible mess with oily gue. I am led to believe that the EGR causes this. There are two little pipes going to the EGr but i have read somewhere that you have to do more than disconnect these pipes.

Help appreciated.

Thanks,

230K

 

[jimmy]

The oil does not come from the EGR valve, the oil comes from the crankcase breather. The EGR valve lets exhaust gases and therefore carbon into the inlet system, this tends to stick to the oil already there.

You can get oil catch pots that sit between the breather pipe and inlet, not seen a specific one for MB cars, although the oil should not be a major problem. Don't worry it's the same on all diesel cars, recently did some work on a 2003 Golf GT TDi and that was the same.

I disabled my EGR valve for a few months by placing a ball bearing in the vacuum pipe, I have now made a blanking plate that sits between the valve and the inlet where it bolts on, instead of the gasket.

Dieselman will be able to explain more specifically about the E300TD.

 

[230K]

Jimmy

Thanks for the quick response, is there any point in cleaning the inlet manifold or will it just get just as bad again?

230K

 

[jimmy]

I cleaned mine just after I got it at about 60K miles, obviously it will take another 60K miles to get as bad. Now at 78K miles there is just a very thin oily film not the thick gundge there was before.

Theoretically clean pipes should improve performance.

 

[tim.100]

Check the discussion on EGR's here - with contribution from Dieselman...

http://mbclub.co.uk/forums/showthread.php?t=10366

 

[230K]

Hi

Blocked the vacumm pipe to EGR with a ball bearing and soon lost all turbo boost, so i am obviously doing something wrong.

230K

 

[Dieselman]

Hi

Blocked the vacumm pipe to EGR with a ball bearing and soon lost all turbo boost, so i am obviously doing something wrong.

230K

You can't block the EGR on any vehicle that employs a MAF sensor. The sensor will pick up on the mass of air not reducing when the valve should be operating and will trip the ECU into limp home mode.
This is achieved by dropping the turbo, as you have found out.

Incedentally a faulty MAF wont detect the blocked EGR, so this can be a crude method of diagniosing a faulty MAF.

 

[230K]

That rules that out then. I will take off the inlet manifold and give it a good clean out.

230K