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Lee52

Active Member

• Nov 12, 2016

• #1

Hi since the ambient temps have started to fall I have noticed an annoying issue with the TD5,

Had a quick search on here found a few results pointing towards the clutch switch but that does not seem to be the problem.

When the car is stone cold the revs will rise between gear changes,like you havent fully taken your foot of the throttle, mainly between 1st and 2nd, as the engine warms up the problem gets less and less to the point it seems to go.

The hydro clutch switch appears to be working fine , cruise control works as it should and drops out as soon as there is some weight on the clutch pedal. The clutch/brake fluid in the res is pretty black and probs been in there for the cars 200k life so will change that out but not holding any hope for the anti surge prob.

BTW no fault codes are present on the car.

Any ideas

 

sierrafery

Well-Known Member

• Nov 12, 2016

• #2

The fact that the CC disengages when you press the pedal is not an evidence of clutch switch perfect function, unplug the switch and bridge the pins in the plug, if then the surge will vanish put a new one, see this thread http://www.aulro.com/afvb/discovery-2/240947-td5-engine-over-run-gear-changes.html it becomes interesting from post #8

 

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Lee52

Active Member

• Nov 12, 2016

• #3

sierrafery said:

The fact that the CC disengages when you press the pedal is not an evidence of clutch switch perfect function, unplug the switch and bridge the pins in the plug, if then the surge will vanish put a new one, see this thread http://www.aulro.com/afvb/discovery-2/240947-td5-engine-over-run-gear-changes.html it becomes interesting from post #8

Click to expand...

Will try this tomorrow but like you say interesting read funny how it will work the cc but not the fuel cut

 

sierrafery

Well-Known Member

• Nov 12, 2016

• #4

Maybe your problem is different but at least worth a try to rule it out

 

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Lee52

Active Member

• Nov 12, 2016

• #5

sierrafery said:

Maybe your problem is different but at least worth a try to rule it out

Click to expand...

Well nothing to lose

 

andy85

Active Member

• Nov 15, 2016

• #6

Mine did this a couple of weeks ago and I don't have cruise control.

 

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Lee52

Active Member

• Nov 21, 2016

• #7

Well not had a chance to try bridging the switch yet as its been behaving itself, so while its behaving itself bridging the switch wont prove anything, just waiting for it to misbehave then I will bridge it and hopefully it will be the switch at fault.

 

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Lee52

Active Member

• Dec 31, 2016

• #8

Well still havent bridged the switch yet, but I plugged the disco in the diagnostics and did flag up a stored code for canbus fault on the engine ecm, drove it rev issue still there, cleared code rev issue gone, both ecm plugs are oil free. been 400 mile since clearing code, its not come back and rev issue gone.

 

sierrafery

Well-Known Member

• Dec 31, 2016

• #9

That's interesting as the manuals dont have a can-bus at all, that's present only on autos

 

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Lee52

Active Member

• Dec 31, 2016

• #10

thats the error code that came up cleared it and the revs are all good (it was read with a delphi clone)

 

sierrafery

Well-Known Member

• Dec 31, 2016

• #11

Erasing a fault code doesnt fix anything believe me, it's only a stored thing in a chip's volatile memory without being linked to driveability... the initial fault has vanished by miracle before that code was erased it has nothing to do with it....if the symptom will reappear insist on the clutch switch

 

Last edited: Dec 31, 2016

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Lee52

Active Member

• Dec 31, 2016

• #12

sierrafery said:

Erasing a fault code doesnt fix anything believe me, it's only a stored thing in a chip's volatile memory without being linked to driveability... the initial fault has vanished by miracle before that code was erased it has nothing to do with it....if the symptom will reappear insist on the clutch switch

Click to expand...

I am not disagreeing with you but I know from the machines I work on at work (auto elec on plant equip) that active/stored codes do have an effect on functionality,

anyways so far so good be interesting if the fault comes back and same fault code appears etc....