Have you checked what the fuel mixture is doing? Sounds like it is running on the rich side
T5frankie (Thursday 19th June 2014)
Looks like they are all running a bit rich.......
My `89 745 turbo was the same 23mpg whatever i did!
Mercedes C320CDI Sport Estate 3 litre V6 7 Gear Auto
Remap 290bhp 628Nm torque @ 1600revs 45.1mpg
You need a 940. My 98 2.3 lpt and 95 2.3 lpt with 15g both do over 30 mpg driven gently and I have seen over 35mpg when in full grandad mode.
However the one with the 15g doesn't get driven slowly as often![]()
smithy (Friday 20th June 2014)
Its not that hard to update to the 940 engine management but if you are going to the effort then a megasquirt conversion would be the way to go
T5Frankie Go estate 940 and put a 740 front end on
I had a lovely lowered silver GLE saloon about 15 years ago. Lovely car but thin rods and older is not worth the hassle - or the fuel bill!!!!! Unless your 740 is just a toy and fuel doesn't matter.
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