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Old 04 December 2007, 04:29   #1
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Disco fuel consumption and "egr removal"

I've had a 300tdi Discovery (auto) for about four months now. Over the last few weeks I've been seriously thinking about replacing it simply because the fuel consumption is so horrendous. I'm presently getting around 20mpg on a good day - careful motorway runs don't seem to improve this much either. With diesel being the price it is at the moment it's costing me a fortune. Anyway, I was reading around and I became aware of this EGR thingy which recycles the exhaust air and ends up clogging up your engine with gunk. I've just ordered an EGR blanking plate kit which will apparently let me block off the EGR.

I know there are quite a few people on here with 300tdis. What sort of consumption figures do you guys get? Has anyone blocked off their EGR, did it make a difference? I've also read that to make it worth wile you need to clean out the intake and inter cooler. Is this a massive undertaking?
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Old 04 December 2007, 04:34   #2
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What sort of consumption figures do you guys get?
Between about 26 around town, and 30-32 if I do a lot of motorway runs. I'm quite surprised yours is so 'low'. I tend to get 500-600 miles to a full tank of diesel. (88 litres, and I usually put between 80 and 88(!) into her when I fill up).

http://www.torquecars.com/tools/uk-mpg-calculator.php


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Has anyone blocked off their EGR, did it make a difference?
Mine was blocked by the previous owner, so possibly.
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Old 04 December 2007, 04:38   #3
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I get about 400/50 max from a full tank.

Where abouts is the EGR?
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Old 04 December 2007, 04:40   #4
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http://www.difflock.com/magazine/Mod...r_300TDi.shtml
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Old 04 December 2007, 04:45   #5
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Arrr perfect. I'll have a go at that later. Just need to get the bloody thing started now.
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Old 04 December 2007, 05:31   #6
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Tim, overall about 28mpg. EGR is still in place. The EGR does not recirculate through the intercooler and the air from the turbo to the intercooler has passed through the air filter so I don't understand the advice about cleaning the intercooler in relation to the EGR. Your intercooler is probably ok but to give it a wee check take off the top hose which connects the intercooler with the inlet manifold. Get a torch and look into the hose connecting pipe to see how it looks. It's bound to be a tad oily and black. If it's very oily and so is the top hose oily, your turbo seals are knackered and passing oil.

The first check for your poor fuel consumption is the air filter. Also, starting should be instantaneous.
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Old 04 December 2007, 10:35   #7
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I blanked the EGR on my L200 and it transformed the thing, a mate did the same to his Disco 300 TDI and reckoned it made no difference. He wound the injector pump back a tad and gets 26/28 average,30 on a run.
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Old 04 December 2007, 11:05   #8
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I blanked the EGR on my L200 and it transformed the thing, a mate did the same to his Disco 300 TDI and reckoned it made no difference. He wound the injector pump back a tad and gets 26/28 average,30 on a run.
I agree - I blanked off my EGR valve on my 300tdi and it didn't help - it does stop crap getting into the intercooler though.

Turning the screw on the pump made a hell of a difference though. Far more power AND better economy. Some late autos had a chip though.

Having said that diesel and autos are a poor match. I had a TD5 auto that wopuld only do about 20mpg as well. It could be the price of fuel has fooled him into thinking the economy is down. A jouney that cost me 20 not long ago is now costing me 30 - good old government - only 72p tax per litre..........
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Old 04 December 2007, 11:41   #9
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...- it does stop crap getting into the intercooler though.
How does it do that, Codders? Serious question.
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Old 04 December 2007, 11:54   #10
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The EGR just takes some of the exhaust gases and send them round again .I dont think they go into the intercooler. My 300 auto would do 400 on a tank and very little more even with carefull driving . Try some additives they do work and may help clean it up a bit .What milaeage has it done and how was it driven before . Diesels like a beasting so it may be a little clogged up from previous owner. If it is a fly by wire throttle you can get a tuning box but it made little difference to mine .
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Old 04 December 2007, 12:41   #11
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How does it do that, Codders? Serious question.
The intercoolers clog up with carbon and oil from the exhaust.
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Old 04 December 2007, 13:09   #12
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Turning the screw on the pump made a hell of a difference though. Far more power AND better economy. Some late autos had a chip though.
Where is this screw? Sounds worthwhile.
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Old 04 December 2007, 13:28   #13
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Does the re-routed Exhaust gas really go through the normal intercooler on the TDi?

Thats mad, of course its going to get bunged up.

Unless I've misunderstood something of course.

My Shogun has a seperate EGR cooler radiator that gets bunged up instead



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Old 04 December 2007, 13:54   #14
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Where is this screw? Sounds worthwhile.
Stand by the driver's side front wheel arch and face the engine. The pump is in the middle under and behind where the aircon pump is if fitted.

There is a small brass anti tamper cap aboput the size of a 2p. Lever it off with a screw driver and the screw is underneath. There is a locking nut and the spindle in the middle has a torx head. Slacken off the nut and turn it about 1/3 of a turn clockwise. Then tighten the nut back up. If you don't get loads of black smoke under acceleration you can keep going and then back off until it's right.

In theory you will use extra fuel but in practice you use less because you don't have to work the engine so hard. With mine I got far more power and went from 23mpg to about 28mpg. i think mine had been set too much to favour low emissions........

There are even more things you can do but they get complicated.

http://forums.lr4x4.com/index.php?showtopic=31
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Old 04 December 2007, 14:22   #15
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Excuse my ignorance, but could this cock things up at MOT time?
Or don't diesels get checked for emissions?

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Old 04 December 2007, 14:40   #16
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Excuse my ignorance, but could this cock things up at MOT time?
Or don't diesels get checked for emissions? Nasher
Possibly but I just run the tank down then fill up with the new expensive super diesel stuff which drastically cuts down on the smog. There is a MOT test which involves reving the bollicks off a diesel which is why they ask if the cam belt has been done on time. I would rather not be present but Farehams ATS lads are good and don't kick the arse out of it and test a second time if its close. A good run before hand seems to help clear the system out if you have been doing lots of town work.

On a long run I can get 580 miles from a tank full, thats Portsmouth to the top of Loch Lomond before the light comes on. Viv get 400 around town.

Tim when was it last serviced? particularly the air filter and does it smoke on acceleration? Have you dipped the brakes in the salty stuff?

Friend has an aftermarket intercooler and recons it transforms a 300 TDI.

Anyone got a slide hammer for pulling dents out of landrover doors

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Old 04 December 2007, 14:41   #17
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Excuse my ignorance, but could this cock things up at MOT time?
Or don't diesels get checked for emissions?

Nasher
No, I think EGR systems (which don't improve the efficiency of an engine, making it breath shitty exhaust gases) were designed to help meet Jap and US emmision regs. It takes a real heapster to fail a UK MOT on emmisions.
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Old 04 December 2007, 14:54   #18
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No, I think EGR systems (which don't improve the efficiency of an engine, making it breath shitty exhaust gases) were designed to help meet Jap and US emmision regs. It takes a real heapster to fail a UK MOT on emmisions.
I meant playing with the fuel pump screw.

The EGR valve on my Shogun jammed up and cost a fortune to replace.
You can't blank it off on the 3.2 like you can on the old 2.8 or 2.5. Buggers up the ECU I'm told.

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Old 04 December 2007, 14:56   #19
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Possibly but I just run the tank down then fill up with the new expensive super diesel stuff which drastically cuts down on the smog. There is a MOT test which involves reving the bollicks off a diesel which is why they ask if the cam belt has been done on time. I would rather not be present but Farehams ATS lads are good and don't kick the arse out of it and test a second time if its close. A good run before hand seems to help clear the system out if you have been doing lots of town work.

On a long run I can get 580 miles from a tank full, thats Portsmouth to the top of Loch Lomond before the light comes on. Viv get 400 around town.

Tim when was it last serviced? particularly the air filter and does it smoke on acceleration? Have you dipped the brakes in the salty stuff?

Friend has an aftermarket intercooler and recons it transforms a 300 TDI.

Anyone got a slide hammer for pulling dents out of landrover doors

Pete

I drove to Loch Something (edited - can't remember which one it was) (where are all those caravans from?) in the summer from Norfolk and back, and used around three tanks (was four but we used a tank whilst up there).

Brakes may have got a bit of salt water on them - will investigate to see if they are binding.

It was last serviced in the spring. I checked the air filter today and it was pretty bad so replaced it. I'm happy the car has been well looked after - it has a complete service history since new.

How bad is the door - repairable or replacement needed
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Old 04 December 2007, 14:59   #20
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As its a door, can you not take the trim panel off and push it out from the inside?

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