That knotty EGR question again..

[SteveGoodz]

... with a slight twist.

Are there any reasons not to disconnect the EGR system if the Discovery in question is fitted with EDC?

[Range Rover Blues]

In that case I'd suggest you do what I did and fit the blanking plate into the pipe which feeds crap intot the top intercooler hose, then leave the rest of the EGR system in place, thinking it's doing it's worst ;)

The EGR system has no way of monitoring the effects it has.

[SteveGoodz]

In that case I'd suggest you do what I did and fit the blanking plate into the pipe which feeds crap intot the top intercooler hose, then leave the rest of the EGR system in place, thinking it's doing it's worst ;)

That's what I was leaning towards.

If I understand the system correctly, the EDC control module controls the EGR valve opening via an elecro-pneumatic module but I'm not sure if there's any feedback of it's effect.

[Range Rover Blues]

The pre-EDC engine has an ECU for the system too, I don't know whether it's been integrated into the EDC though.  Another reason I favoured the approach was that I didn't have to try and remove any bolts form the exhaust manifold, plus it looks totally standard if anyone checks.

[SteveGoodz]

From my reading of the description in the workshop manual, the EDC controller tells the EGR valve when and how much to open. What's not clear though is if there's any feedback to the EDC controller to show how much the valve actually did open but I'm guessing not.

I think I'll refit the EGR gubbins and simply bank off the pipe going to the top hose, as you suggested.

Thanks for the thoughts RRB  :)

[BigA]

can you not just disconnect the loom from the EGR and see what happens? 

[SteveGoodz]

can you not just disconnect the loom from the EGR and see what happens? 

The problem with that idea is, what would I expect to happen?

At the moment the EGR valve and hose is removed (has been for some time) but I can't say I noticed any change in the vehicles performance/smoke levels. What I have recorded is that since the EGR was removed the fuel consumption has gone up by about 4mpg and was wondering if not having the EGR fitted is confusing the EDC controller into over-fuelling the engine.

I'll refit it at the weekend and monitor fuel consumption for a couple of weeks.

[BigA]

ahhhhh..... you have, its all clear now