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Offline Landyrover

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Fast Reverse Problem
« on: November 16, 2007, 16:17:26 »
Greetings All,

Just returned from a four hour motorway trip. As usual, I turned the truck round to reverse into the drive. However, when I let the clutch in, the Disco sped up violently and stalled - repeated this several times with the same outcome. Seemed OK in low box reverse but can't be sure reverse speed at idle was as slow as it should have been.

What's going on? Clutch problem developing? Its a 2002 Td5 Disco with 53k on the clock.

Any words of wisdom much appreciated!

Cheers,

Nick
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Offline Jimbo

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Fast Reverse Problem
« Reply #1 on: November 16, 2007, 16:49:42 »
Might need to get someone to plug some diag kit into the truck to make sure all the electrics are working ok - I just blagged this off the DOC Tech site, you haven't had any clutch work done recently that might have let air get in the system ? The clutch switch mentioned below tells the ECU to drop the revs when the clutch is pushed down - if the switch fails (or gets air in it), maybe you'd get your problem.

"Clutch switch
The clutch switch is fitted only to vehicles equipped with a manual gearbox. The switch is an hydraulic pressure switch and is located next to the clutch master cylinder. When the clutch is engaged, i.e. pedal released, the switch will be in the open state. When the pedal is pushed and the clutch is disengaged, the switch will change to the closed state. The ECM will suspend cruise control operation in response to this change of state. The ECM will also reduce fuelling in response to this signal, to reduce engine surging (dampens the effects of fast throttle transitions to eliminate jerky vehicle movements). If the clutch switch fails at any time then the ECM will not support cruise control operation. In addition, the engine will be more susceptible to surging at times when the engine is decelerating quickly."
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Offline discoverytdi

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Fast Reverse Problem
« Reply #2 on: November 16, 2007, 20:36:34 »
Another reason not to buy a TD5, defo sticking to my 300 no electric gremlins to go belly up
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Offline extreme90

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Fast Reverse Problem
« Reply #3 on: November 16, 2007, 20:48:23 »
Quote from: "discoverytdi"
Another reason not to buy a TD5, defo sticking to my 300 no electric gremlins to go belly up


me finks your just scared  :wink:
id have a td5 powerd challege truck any day  :wink:
dan
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Offline DEANO3528

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Fast Reverse Problem
« Reply #4 on: November 17, 2007, 00:07:36 »
What a nightmare!
For years, the driver has quite easily coped with lifting the clutch at the right moment, while pressing the throttle the required amount to counteract stalling.
Excuse me if I continue to avoid these spawn of the devil. What worries me is the possible built-in redundancy that may leave owners stranded anywhere with a dead vehicle beyond economic repair in ten years time.
Or am I just being a tad cynical?
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Cheers
DEANO

Offline Range Rover Blues

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Fast Reverse Problem
« Reply #5 on: November 17, 2007, 00:51:01 »
What's more worrying is when this surging due to a faulty sensor causes someone to have a crash.
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Offline Thrasher

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Fast Reverse Problem
« Reply #6 on: November 17, 2007, 00:55:50 »
..and it's so different to a sticky throttle cable how?
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Offline Range Rover Blues

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Fast Reverse Problem
« Reply #7 on: November 17, 2007, 00:57:47 »
Well for one a sticky throttle cable never caused a vehicle to pick up speed on it's own........
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Offline Thrasher

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Fast Reverse Problem
« Reply #8 on: November 17, 2007, 01:07:48 »
Um...it does. Try and press pedal .. get some resistance. Push a tad harder and WHAM!

I know this because I currently ahve half of Tixover on my plenum :s
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Offline Landyrover

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Fast Reverse Problem
« Reply #9 on: November 17, 2007, 11:32:19 »
Quote from: "Jimbo"
Might need to get someone to plug some diag kit into the truck to make sure all the electrics are working ok - I just blagged this off the DOC Tech site, you haven't had any clutch work done recently that might have let air get in the system ? The clutch switch mentioned below tells the ECU to drop the revs when the clutch is pushed down - if the switch fails (or gets air in it), maybe you'd get your problem.

"Clutch switch
The clutch switch is fitted only to vehicles equipped with a manual gearbox. The switch is an hydraulic pressure switch and is located next to the clutch master cylinder. When the clutch is engaged, i.e. pedal released, the switch will be in the open state. When the pedal is pushed and the clutch is disengaged, the switch will change to the closed state. The ECM will suspend cruise control operation in response to this change of state. The ECM will also reduce fuelling in response to this signal, to reduce engine surging (dampens the effects of fast throttle transitions to eliminate jerky vehicle movements). If the clutch switch fails at any time then the ECM will not support cruise control operation. In addition, the engine will be more susceptible to surging at times when the engine is decelerating quickly."


Thanks Jimbo, this sounds like it might well be the problem - I do also experience some slight jerkines when taking my foot off the gas completely - this might be the surging described in the last sentence of your post?

Re cruise control, I used this without prolem for 95% of the journey so don't know if this also might have a bearing on it?

I'll give R M Motors a ring on Monday and get it checked out...

Cheers,

Nick
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