Manifold Crud
The thick black crud on the inlet manifold is coming from the crankcase breather, not the EGR. On the Disco 300TDI there was a service requirement to clean the manifold AND THE INTERCOOLER. This improves engine performance because of improved cooling of the incoming charge. Cleaning the rubber hoses will not make a significant difference because they are rubber and a poor conductor of heat. Cleaning the intercooler on the TD4 is a bit of a fag, (front bumper off to start with!).
If the EGR valve is sealing properly the easiest way to dispense with recirculation is to blank the vacuum pipe from the control solenoid.
 
vic.middleton said:
Manifold Crud
The thick black crud on the inlet manifold is coming from the crankcase breather, not the EGR. On the Disco 300TDI there was a service requirement to clean the manifold AND THE INTERCOOLER. This improves engine performance because of improved cooling of the incoming charge. Cleaning the rubber hoses will not make a significant difference because they are rubber and a poor conductor of heat. Cleaning the intercooler on the TD4 is a bit of a fag, (front bumper off to start with!).
If the EGR valve is sealing properly the easiest way to dispense with recirculation is to blank the vacuum pipe from the control solenoid.
Click to expand...


On my Td4, the crud came from the sooty exhaust gasses coming via the egr & mixing with the oil that seems to find its way in via the turbo side on these models & coats the whole inlet system. My crankcase breather has a filter fitted which blocks the crud & eventually clogs up badly if not changed every 12,000 miles. Best way to disable the egr is to fit a bypass which also doesn't block the airflow to the inlet manifold. My car is a 2003 Td4 Auto, so I can't say that every car would be the same.:)
 
chromiumuk said:
On my Td4, the crud came from the sooty exhaust gasses coming via the egr & mixing with the oil that seems to find its way in via the turbo side on these models & coats the whole inlet system. My crankcase breather has a filter fitted which blocks the crud & eventually clogs up badly if not changed every 12,000 miles. Best way to disable the egr is to fit a bypass which also doesn't block the airflow to the inlet manifold. My car is a 2003 Td4 Auto, so I can't say that every car would be the same.:)
Click to expand...
My Freelander is also a 2003 Auto. If your exhaust is so sooty I would suggest attention to the injectors is required.
The EGR blanking mod in no way blocks fresh airflow to the manifold, it stops exhaust gases being fed back into the manifold. You say that the filter in the crankcase breather requires changing every 12000 miles. Doesn't that suggest that the crud is coming from the crankcase since it is fed in just before the turbo inlet, which is upstream of the EGR injection? Although it looks like a filter it is in fact an oil separator which collects the oil and diverts it back to the sump. See elsewhere news of a new BMW part replacing the 'filter' with a centrifugal device.
 
vic.middleton said:
Manifold Crud
The thick black crud on the inlet manifold is coming from the crankcase breather, not the EGR. On the Disco 300TDI there was a service requirement to clean the manifold AND THE INTERCOOLER. This improves engine performance because of improved cooling of the incoming charge. Cleaning the rubber hoses will not make a significant difference because they are rubber and a poor conductor of heat. Cleaning the intercooler on the TD4 is a bit of a fag, (front bumper off to start with!).
If the EGR valve is sealing properly the easiest way to dispense with recirculation is to blank the vacuum pipe from the control solenoid.
Click to expand...

Correct,
see also http://www.landyzone.co.uk/lz/f9/egr-oil-64768.html
 
vic.middleton said:
The EGR blanking mod in no way blocks fresh airflow to the manifold, it stops exhaust gases being fed back into the manifold. .
Click to expand...

But if you leave the EGR valve in place the internal shape offers more of a restriction than the replacement pipe which is a plain tube.

Allan
 
OK Earthlings. . . . . . . .Update of how i found the td4 after the blank mod. . . . .so thought i would monitor it over time and my own conclusions are ,better response at low revs, seems smoother over all less smoke on kick down, MPG=the same really 0-60=bout the same . . .have kept the old unit in case MOT gets funny bout the mod, OK to cut to the chase is it worth doing. . . .yes the actual system is a crap idea and after say 20,000miles it will defo clog up your inlet and as such will impair the engines breathing,it is not gonna give you rockit response but you do notice a better low down feel so is it worth it ?. . . . .I'm orft ta PUB :) :)
 
Hi ming,

Thanks for the info. As far as I can see also the bypasspipe will clog up as much as the egr valve as the airflow comes the same way and the clogging up is caused by the oily air coming in through the engine breather valve. With the egr blanked off this oily substance will not harden as no hot exhaust gasses coming through it but the amount of dirt will remain the same I think ??
 
willo said:
Hi ming,

Thanks for the info. As far as I can see also the bypasspipe will clog up as much as the egr valve as the airflow comes the same way and the clogging up is caused by the oily air coming in through the engine breather valve. With the egr blanked off this oily substance will not harden as no hot exhaust gasses coming through it but the amount of dirt will remain the same I think ??
Click to expand...
. . . . .Yes you could be correct Willo [I also thought that] but time will tell, let you know after 20,000miles :) :) :)
 
ming said:
. . . . .Yes you could be correct Willo [I also thought that] but time will tell, let you know after 20,000miles :) :) :)
Click to expand...
so having one of these egr valves fitted dose it afect the mot in anyway as mine is fitted with one and due for mot thanks
 
cremator said:
so having one of these egr valves fitted dose it afect the mot in anyway as mine is fitted with one and due for mot thanks
Click to expand...
i dont know the answer to that wun ,my mot int till march so i kept the old unit un it dont take long to swap. . . .:)
 
Hi cremator,

For what it's worth but my EGR blanked off since a couple of years now and have passed the MOT (in Belgium) the same number of times and never have had any problems whatsoever. I have the impression the values measured were even lower than before. I guess the way of measuring is the same in the UK as overhere, just stuff a pipe in the pipe and wait till the meter starts acting crazy ???:D :D :D

Mine is just blanked off but the result should be the same, except that with mine there is less airpassage (slightly less enginepower as I see it) but for the rest it's all the same?
 
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