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[Kevin Wood]

Bear in mind that Servotronic units are programmed with a level of sensitivity and your two might not be the same. There are several sets of sensitivity settings, the choice of which depends on the steering box according to Tech 2 so it's possible that you now have the "wrong" settings for your box or vice versa.

Each set of settings has 3 values that can be programmed for "Minimal assist", "Normal" and "Maximum  assist", so your replacement unit might not have had the same settings and that could account for the difference in behaviour.

Having said that, something weird is going on. It sounds to me like the MID is losing the speed input temporarily now (Hence the "F" for "fail" in the display).

This could be something such as the ground signal for the servotronic (or anything else that sits on the speed signal) being poor, such that, when it starts consuming current, it drags the speed signal outside the normal range and prevents other devices from seeing it.

Does everything else behave if you completely remove the servotronic box? (note:steering will be heavy).

Kevin

[VR4Dave]

Thanks for the response both of you.
Will try driving without the relay in and see what happens, did drive it twice with a failed steering pump and that was bloody heavy!

Kevin, with regards to the fail signal basically if I have the cid set to show me fuel range I will have the miles displayed most of the time except when slowing down around the 40mph mark then I get the F briefly. If I have speed or mpg selected then I have "0" displayed most of the time with the brief F when slowing down as above.

[VR4Dave]

Update:
Right, driving without the servotronic box in made no difference, to the other things - just made me arms hurt!

However I had a problem the other day where driving at about 50 on a non slippery straight bit of road the TC light came on and I lost power (no throttle response) I assume cut by the TC. I couldn't deactivate the TC with the button.
Turned off car and restarted and fine. (posted the problem on  general help "bloody weather")

Someone suggested speeding up to 60 and letting it slow to 40 on the over run a couple of times to reset. I did this and this is where I noticed that it is when doing this that I get the "F" instead of a zero on the display for mph, speed, isntant mpg etc.

Also now have a code 1500 throttle motor. I did some more research and found this posthttp://www.omegaowners.com/forum/YaBB.pl?num=1290263706

I think this could be my problem too given the fact that it's all so intermittent and I have no problems with cruise,speedo or abs.

How do I find a bad earth?