Thread: TD5 engine over-run on gear changes

You should have asked before spending money on a TPS cos it's most probably the clutch switch(MSK500020), if the D2 is facelift it's screwed into the bottom of the master cylinder if not it's on the fluid line near the fusebox(like in the attachment)... if you move with talent and keep the pedal depressed while you swap it you may escape without bleeding

Same symptoms if you use an auto ECU in a manual (MSB ECUs that is)

Originally Posted by towe0609

Same symptoms if you use an auto ECU in a manual (MSB ECUs that is)

Guess why

...cos the auto ECU doesnt have the hardware for the clutch switch input

Originally Posted by sierrafery

Guess why

...cos the auto ECU doesnt have the hardware for the clutch switch input

Yes, exactly.

Another way to check the clutch switch (assuming you have a manual transmission Engine ECU) is to set the cruise control then press the clutch - the cruise control should disengage.

Took Disco for a drive today and tried Gazk's test - cruise on and set, depress clutch and guess what ....... cruise disengaged instantly, but engine still ran on for a second or two. Does this suggest the clutch switch is functional and is not the cause of my woes? The vehicle has very k's (140k) so one would think not mechanical, but then again it is 14 years old and age can be as telling as Kms on vacuum lines etc. Should I change the clutch switch or look elswhere?
Any advice would be appreciated.
Cloughy

Just confirm are you 100% certain you didnt touch the throttle or brake by reflex at that very moment?...cos if you are then the switch seems to be ruled out, make one test more to be 100% positive with it, unplug it and make a test drive then if still the same bridge the pins in the plug and see then(leave cruise controll alone during these tests) if no change the switch is OK and then it's above my imagination what can be the culprit.

Thanks for your post Sierrafery,
Tested clutch switch disconnected - still have over run.
Tested Clutch switch bridged - no over run.
Found oil is connection, suspect switch is starting to weep, which may be the reason cruise disconnection is still operational - voltage may be enough to disconnect cruise, but not enough to cut fuel. New switch is on its way and will go in when it arrives - Thanks for your help.
That is what makes this forum so great - knowledge from those that have gone before us!

Cloughy