300 TDI emmissions problem

Hi everyone

I have a 1996 Land Rover Discovery 300 TDI, which failed its mot test on saturday, on emissions only. the disco had been standing for 2 months on a sorn, so was told to rag it around in low gear to give it a good blow out.....

I have changed the oil.....changed the glow plugs, airfilter, and added millers sport 4 which cleans the injectors and helps with emissions by bringing them down....i have gone from as high as 4.98 to between 3.44 to 3.89, this is still a falure, so i am hoping that someone here may be off help...

Thanx


John

This might help.....


19th-February-2008, 23:45
pos
Senior Member
Join Date: Apr 2007
Location: West Yorkshire
Posts: 1,793


Re: Veg oil..whats the big deal?
As longs as the weather is warm just whack a bit in the tank with some diesel. You could technically run it on 100% veg oil, but I wouldn't recommend it because the older lucas / Cav fuel injection pumps are very fragile and need the finer lubrication from diesel in order to run properly and remain fully lubricated. I have been running my 2.5 N/A on about a third veg oil last Summer and it ran well, but following a recent engine overhaul, my cylinders were heavily glazed. Whether or not this was down to the vegetable oil or just the effect of diesel over time I do not know, but one of my cylinders had been worked on earlier in the year and all four looked just as glossy.
The only thing to worry about is the glycerin content in straight vegetable oil. This can, when the weather is colder clog up your injectors and fuel lines because it thickens out and turns into a white wax like substance. You can remove the glycerin which gives you bio-diesel.
The other alternative is to buy a kit which allows you to switch to veg oil when the engine is warm. You basically startup with diesel, and then switch to veg oil when the engine is up to temperature, before switching back to diesel a good few miles before you are going to stop to allow it back into the system again ready for startup.

The main advantages are a cleaner burn with less emissions, better engine lubrication (don't know how cos it gets blasted straight away!) and of course it's also cheaper. The prices are rising in Britain, and for 85p a litre you're just as well sticking with standard diesel, unless of course you want to lower your emissions!

-Pos
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Last edited by pos; 19th-February-2008 at 23:48.

i will give this a try, cheers...just one other...if i add 20ltrs of deisel how much veg oil do i add.

regards john

From a near empty tank I use 60 litres of Morrisons vegetable oil (20 three litre bottles at about £2.56 a bottle) and top off with diesel. Thats roughly 75/25.

discobill said:

From a near empty tank I use 60 litres of Morrisons vegetable oil (20 three litre bottles at about £2.56 a bottle) and top off with diesel. Thats roughly 75/25.

Click to expand...

thanx...but my calculations comes to 90 litres, or am i reading it wrong

Cheers

John

both the 200 and 300 will run all day on 100 percent SVO - there's really no need to be getting yer calculator out - pour a good few litres of the stuff in the tank, take the landy out for a good few miles to get it nice and hot - then get it tested

john1uk said:

thanx...but my calculations comes to 90 litres, or am i reading it wrong

Cheers

John

Click to expand...

Roughly 75/25..... I know its an 89 litre tank.

have ya read this?