Mercedes 190D 2.5T power loss / overload mode

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Hi!

I am having some problems with my 190D 2.5T and found a similar thread

on this forum:

http://mbca.cartama.net/showthread.php?t=534&page=2

And heres another:

http://mercedesshop.com/shopforum/sh...=222418&page=2

The sympton is extreme power loss. Car is a total dog. Strulling to

maintain 60mph on the motorway.

I have tried bypassing the overload valve and this fixes the problem! I

removed it from the car for diagnose, and it seems to work fine.

The connections are as follows:

normal: 2-|
power on: 2-3



I am unsure how the overload switch is activated, but I understand the

manifold pressure switch is one of the "ways". I tried unplugging the

cable for it, but the problem remains. What other reasons are there?

Thank you very much