Anziani,

Not sure what mode limp home is ... are you talking about an engine management limp home or transmission limp home ...in either case, not sure how ASD operates within constraints of limp home. And, to be clear, you are talking about ASD?

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg