200TDi - judder when applying/releasing throttle

[MarkRSi]

I've had my 'new' (well, 18 year old 130k mile) Discovery 200Tdi for a few weeks now. One of the annoying niggles is when I completely lift off or start applying the throttle again unless I'm very gentle the drivechain will judder.

I assume it's to do when lifting off it cuts all fuel to the engine suddenly (causing the drivechain to judder), then as you come on the throttle again it suddenly injects a bit too much fuel causing a surge and another judder. I've encountered this on a few fuel injected cars and bikes but it's very noticeable on the Discovery.

Assuming that makes sense, any ideas?

[budrover]

try looking at your hand brake ...normally only does it when setting off or reversing ... but a common cause of defender / disco judder. Spring snaps inside allowing the shoe to float about.

[MarkRSi]

budrover said:

try looking at your hand brake ...normally only does it when setting off or reversing ... but a common cause of defender / disco judder. Spring snaps inside allowing the shoe to float about.

Only does it while on the move. No problems when moving off (I guess since it will at least be pumping the required fuel to keep it at idle).

[MarkRSi]

fesuvious said:

Knackered prop UJ would be the prime suspect for me.

Get underneath and give'em a wiggle

I guess I could give that a check.

Thing is it's not really the the 'judder' thats the issue - it dies down quickly so probably more accuractly described as a jolt/lurch? - It's more the hair trigger throttle response where 5% of the travel seems to give 50% of the power that causes the said jolt unless you're extremely sensitive with the throttle. Dunno if this is a characteristic of the 200TDi or something to do with the fuel pump/injectors etc.?

Edited by MarkRSi on Tuesday 25th October 15:34

[Hooli]

Could be worth taking the round inspection cover off the back of the T'box & inspecting the splines in the input shaft.

[MarkRSi]

Hooli said:

Could be worth taking the round inspection cover off the back of the T'box & inspecting the splines in the input shaft.

Funnily enough my old man asked someone about this the other day and did suggest the splines in the gearbox (or possibly transfer box) could have some play in them. Only way to rectify it was to replace the gear/transfer box which might be a bit overkill.


Currently painting the inner wings (probably a more important task TBH ) but will check the tranfer box mountings/spline & prop shafts when I can.

Cheers everyone

[paintman]

Wear in the gearbox output shaft splines was a common issue on LR gearboxes prior to the introduction of the cross-drilled transfer box input gear.
Have a look at the pictures in this link:
http://forums.lr4x4.com/index.php?showtopic=52887

Remove the round plate on the upper rear face of the transfer box. With the engine switched OFF and any gear engaged rock the vehicle back & forth. You don't want to see lots of play between the splines of the gearbox output shaft & those of the transfer box input gear - and you don't want to see loads of grot & swarf or lots of wear in the splines.