I have a 3.5EFi range rover and its idleing all over the place.

Its an auto box and when its put into park or neutral the revs shoot up, when drive, 1st, 2nd, 3rd or reverse are selected it wont tick over with your foot on the brake.

The throttle set up is baffling me, there is the standard cable and return spring, but also another cable coming off the other end of the throttle linkage that dissapears up the tunnel.

What is this cable for?
Anything to do with the auto box?
Thanks

I believe the cable going up the tunnel will increase the revs slightly when you engage drive... this is to stop the engine stalling.

Might be worth disconnecting it from the throttle linkage and see if that cures it. You may then see a dip in the revs when you engage drive.

If that works then its the mechanism at the auto box behaving erratically.

Steve

could be the kick down cable.

it lets the gearbox know you want it to change down when you floor it.
tom

think its just the throttle sensor..
wich does kickdown AND anyother thing..

sow generaly the input for the autobox..

Tks

Cable down to the back is the kick down, it should be loose on idle, if the gear changes are sloopy take up a bit of slack to improve the feel

The correct adjustment for this is full throttle, cable as far out as it pulls, it drops over a detent spring for the kick down, anyway nothing to do with your problem.

You do not adjust the idle on the plenum by opening the butterfly this is set to a fixed amount open. There is an air bleed screw near the entrance, fuel mixture adjustment on a 3.5 RR is on the flappy box with allen keys, dig out a bung on the side of this.

If the mixture is wrong and twiddling the screw up and down has no effect (usual on an old car) pick off the black plastic lid, and try adjust the preload by the clock spring a couple of clicks until the mixture screw has some effect.

But before you do any of this wizz over the inlet manifold bolts, the rear ones tend to get loose.

Should add, the wipers wear tracks in the flappy box, if these are dirty then idle goes to pot, try cleaning them with a pencil rubber.

Regards Mark

[Edited on 21/1/08 by mark chandler]