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Thanks all.
I suppose a good idea with this sort of problem might be, to remove the OVP and see what happens! In my case, no change to the engine's running. This means the OVP is not doing anything, so many electrical and important functions (eg cold starting) will not be operating and my engine is not running as its proper self.
Whilst tracing an ASD diff problem, I have realised the OVP relay is faulty (well either that or one of the wires to it is).
I did a wiring bypass (bridged pins 87E and 87L with the OVP still in there if anyone cares) and solved the problem. At the same time, my idle became more normal and the poor response *seems* to have gone (only had a 5 minute test drive though).
So I need to either replace my OVP or find out what powers it if it is not the OVP. I'm fairly confident it is.
Not only that, my ABS was working properly so I had thought the OVP was fine. Apparently not the case in these twin-fuse ASD equipped 190Es.
Thanks all that helped, I hope this information helps someone else out there!!
Russell
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