As the title suggests, is it possible to reset the EHA to factory value?

I'd imagine so but I think it would require checking lower chamber pressure against some spec under some condition?

I'm tracking down some low fuel economy on my 190E 3.0. Its current around 200-220 (I dont recall the exact number on my odo--but not higher than 220) to just under 3/4 tank.

I'm planning on doing a tune-up soon, however someone mentioned the EHA might be responsible. I have two of them, I know one is adjusted and one is not. I'm not sure which is which anymore.

-Kris

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