Yep it all sounded normal enough but on the diagnostics you could see the pump on a low load basis wasnt dropping from a hi state into the low which it should have..
I know im so glad its sorted, original diff must have had a seized clutch plate, 2nd diff had a faulty precharge pump... so now iv a spare working controller to sell which should recoup some costs I guess..
Without no thanks from any Audi specialists or mechanics I fixed it myself, swapped the precharge pump and done an oil change... et voila, working 4wd :) PERFECT, so happy!
Just a thought but would it be my steering angle sensor? Perhaps the car doesnt know what the steering angle is and thus doesnt know when to turn the pump off?
Where is the sensor located at? VAGCOM shows the angle quite clearly correct so maybe not?
Well im going to swap over my haldex pre charge pump to see if this fixes it or changes its behaviour, if it does i'll get the one off the 4motion.
After that im calling it a day and selling it. I've spent hundreds.
Ok another update.
Got the controller off the mk4 4motion fitted tonite.... drives exactly the same as my last controller did. So i'm ruleing out the controller being the problem.
All im left with now is to swop pumps from my old diff to this one and see if the behaviour changes. After that im...
My original diff was taken out inc its controller, swopped with 2nd hand diff and its controller, it was no better so i swopped it back to my original controller which made it worse, so with the change in behaviour im thinking its 2 duff controllers, I have a 110% working controller from an 01...
Okay another update.
Vagcom testing, section 22 AWD
Basically If I run the diag. test, to engage the pump I can hear it turn off and on as the test runs, good I think
Next clutch engage/disengage no problems
Now while testing, with the pump state in "hi" all I get is clunk clunk clunk, when...
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