Vehicle & Technical > Range Rover

Auto keep stalling???

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Jonny Boaterboy:
I seem to have developed a problem this morning on the way into work... when pulling up at a set of lights I put it in Neutral to find the tic over wont settel and is cycling between 1000rpm and 600rpm and then when you engage drive it stalls?

Any ideas what might be causing this?

Thanks

Jonny

Bowie:
Sticking idle stepper motor, almost guaranteed :)

SteveGoodz:
I think Bowie is right .. sticking stepper motor. Easily cleaned with some brake cleaner.

I did wonder though why you put it into neutral at the lights anyway? Was it running rough before that?

Jonny Boaterboy:
Perfect I knew you would have the answers...... just a minor point what's a stepper motor and where is it and what does it do, and how do I get it out!! ? Do I need to get a new one or will just a clean up be ok?

I have always put it into neutral when pulling up at the lights as that what it advises in the hand book? I guess it takes some of the wear of the clutches in the gear box box. It makes me look like a good driver to the car behind as well!  :D  (i.e. brake light goes off indicating I have applied the handbrake)

Tar

SteveGoodz:
Ah, well telling you where the stepper motor is would take all the fun out of this wouldn't it? It's located on the back of the plenum chamber and sticks out towards the drivers side (assuming it's a right hand drive vehicle). It has an electrical plug on the end and is screwed into a removable boss. When you unscrew it you'll see a plunger with a conical end that the motor moves in and out of a tapered hole in the boss. They tend to get clogged up and can be cleaned using brake cleaner or petrol. If cleaning doesn't work it usually needs replacement but they can, sometimes, be set to work on a different part of the range. Needs a suitably equipped garage with computer equipment to do that.

My question about using neutral when stopped at lights comes from a discussion on another board. My old BMW 7 series (e32 model) had exactly the same gearbox and the owners manual was very specific about not putting it into neutral at lights/junctions/etc. ZF - the manufacturer - also used to give this advice on their web site ... something to do with the loads induced when going from N into gear being greater than simply leaving it in gear and oil pressures being lower when N is selected. Can't find it on their site now though :-(

Of course, you can still put the handbrake on and take your foot off the brake if you want to (appear to) be a good driver. The handbrake should hold it ... I do it all the time ... and you can get some wickedly quick pull-aways by hitting the accelerator as you release the handbrake :-)

Enjoy your driving :-)

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