mine was intermittent too. sometimes I'd lose 4wd after 5 mins, sometimes after 15 secs.
it'll be the pump/electrics in that one module under the diff...
well we've got nothing to worry about as we all have rego and no outstanding fines.
what's the big deal?
I am looking forward to it getting up so it gets all the dodgy farker 25y/o shitboxes with no rego spewing shit out off the road.
18 ETS pressure switch or circuit
I had that problem on my 32GTR
2 x second hand 4wd hydraulic pumps (the one under the rear diff - look like two beer cans stuck together) later, and it's fixed...
i don't know if it's got a "U" inside it, but probably not - it's not that long.
they built it for the car last year - previously it had a 3.75" Trust Power Evolution II that did over 105db...
nasty.