rear diff lock goes on but not off

[andyg plym]

my new coupe has a slight problem with the rear diff. it turns on fine but wont disengage, apparantly you have to get underneath and manually switch it off.

could it be a vaccuum line?if so would this cause loss of boost? or a problem with an actuator?

any btdt???? cheers

[lind4hl]

humm..

the solenoid on the diff may be broken?

[Acidburn]

might just be stiff from not being used, can you hear any air leaks as there is pipework for the actuator going thru the car.
Also does it turn off when you go over iirc 30mph (might be less been a while since I looked) my 20v qs had this problem I had to drive it to disengage it.

[andyg plym]

they automatically disengage after 23mph i once was informed......i pick it up on sunday, just want to hit the ground running!!
it seems it may have a boost leak too (theres a funny old thing) and so wanted to know if the vaccuum lines to the diff were fooked how much impact it would have on boost.

[lind4hl]

if the vacuum line was broken, then it wouldnt lock AFAIK ??

[Error404]

there are two lines from the actuator under the rear seat to the diff, blue and yellow.. not sure which is which... my guess is one of those is disconnected / leaking or as Pete says its just stiff / seized

[chezz]

they automatically disengage after 23mph i once was informed.......

Mine WAS engaging at 60 - 70 mph! The eeriest schreeching sound you will ever hear from the rear.
Disconnect the electrical connector to the plastic "spam tin" shaped unit under the rear seat to disable it, in order to drive it. This should allow you to deal with the cause later.

[Rusty]

They don't disengage over 40kph if you snip the blue/white wire that goes to the control box

[Jolfa]

They don't disengage over 40kph if you snip the blue/white wire that goes to the control box

Does it still disengage on the switch ok if you do that? :mischeif:

[lind4hl]

yes!

[Gompa]

They don't disengage over 40kph if you snip the blue/white wire that goes to the control box

top tip for the snowy weekend (if it lands here anytime soon)

[david]

they automatically disengage after 23mph i once was informed......i pick it up on sunday, just want to hit the ground running!!
it seems it may have a boost leak too (theres a funny old thing) and so wanted to know if the vaccuum lines to the diff were fooked how much impact it would have on boost.

in't supposed to disengage at 15mph?