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Autobox holding in gear for too long when cold
Posted: Thu Jul 21, 2011 4:08 pm
by TerryG
The auto box on my Range Rover is holding in gear for too long when it's cold. After it has warmed up all is well. If i let off the throttle it changes up and if i accelerate again in the new gear it is fine, foot flat to the floor and it kicks down as it should but it doesn't want to change up by itself.
This is getting slightly irritating but isn't stopping me using the car every day.
It had new fluid (but not a filter change as the x-member is stuck) about 10,000 miles ago and this is getting progressivly worse.
Any ideas where to start?
Re: Autobox holding in gear for too long when cold
Posted: Thu Jul 21, 2011 5:45 pm
by harvey
I assume this is a ZF box, and they're not exactly something I know a lot about, but I think I'd go for the filter first. Cold oil will be thicker so have more difficulty being sucked through the filter. IIRC you have to jack the chassis rails apart to get the crossmember out. After that if it kicksdown when needed you would have to assume that is working correctly, whether it's cable or vacuum operated so it might be a sticky governor not building up pressure to trigger the changes. But tbh you'd be better off finding someone who knows a bit more about them that I do. (Which shouldn't be too hard....)
Re: Autobox holding in gear for too long when cold
Posted: Sat Jul 23, 2011 9:11 pm
by Dave M
^^ WHS ^^
Almost certainly a faulty govenor valve. It can be caused by lack of pressure because of a dirty filter but, occasionally changing the fluid and/or filter will actually make it worse as the fresh fluid will dislodge tiny particles of dirt which then get caught up in other parts of the box. The govenor can be removed, cleaned and new seals fitted with the box in situ - but the transfer box has to come out though. Any good autobox specialst should be able to sort it for you - or give these guys a call for some more advice
http://www.ashcroft-transmissions.co.uk
Re: Autobox holding in gear for too long when cold
Posted: Sun Jul 24, 2011 10:09 pm
by TerryG
Nuts, never mind i have an HP24 sitting in the garage so i'll try a new filter and another change of fluid then give up and change it, however as i have at minimum blown another head gasket and as the engine will currently not turn over further investigation will have to wait until they are fixed and the car is once again mobile.
Thanks for the suggestions guys
