johntom Posted September 29, 2010 Share Posted September 29, 2010 Hi i have recently bought a 1997 Discovery tdi auto (EDC) which only returns 21mpg stop/starting and today, 26mpg on the motorway @ 60mpg(125 miles on £25). According to the handbook (and a previous tdi auto) the mpg seems low. The disco has done 129k and is pretty much in superb condition, it has been de catted and the EGR valve removed. I have looked in the sedimenter which was clean, removed and soaked the intercooler (hardly any dirt), removed/soaked the inlet manifold (oily inside) and changed the cambelt, none of which has made a difference. It has a K&N filter fitted which i have cleaned in pj1 filter cleaner. The general performance doesn't seem that great. Is the MPG normal and what else could be wrong? Quote Link to comment Share on other sites More sharing options...
cackshifter Posted September 29, 2010 Share Posted September 29, 2010 Maybe needs an injector service or the viscous fan coupling has seized? Nigel Quote Link to comment Share on other sites More sharing options...
monkeyb0y Posted September 30, 2010 Share Posted September 30, 2010 What types are on it...I've got mud and my Economy plummeted... Quote Link to comment Share on other sites More sharing options...
monkeyb0y Posted September 30, 2010 Share Posted September 30, 2010 Sorry...typo, meant tyres... Quote Link to comment Share on other sites More sharing options...
johntom Posted September 30, 2010 Author Share Posted September 30, 2010 Hi they are BF Goodrich AT 245 x 70 x 16 Quote Link to comment Share on other sites More sharing options...
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