Slipping Clutch symptoms but only in 6th

Driving along the M25 in 6th at 65mph and accelerated to pass a truck, at about 3000rpm I noticed a blip rise in rpm (on the tachometer) for only a second accompanied by a change in engine note, the car continued to accelerate smoothly.

Funny thing is it only did this in 6th at around 3000rpm, after I came off the motorway I booted it away from the lights and all seemed well in the other gears.

I recreated it a number of times but its like a blip.

Anybody observed this before?

[Gazski66]

Not heard of that before, have you got it booked in?

[DavidDS3]

Is your motor a diesel? I had similar problem in a C4 which I had remapped. It was due to the increased torque on the dual mass flywheel.

[lfcrule1972]

Nah SfG has a petrol DS3, I've not heard of this either before, in my past experience I tended to notice clutch slippage in lower gears not the highest one

[Superfly Guy]

Nah SfG has a petrol DS3, I've not heard of this either before, in my past experience I tended to notice clutch slippage in lower gears not the highest one

Exactly, cant be a slipping clutch. Im taking it out in a minute so il see how it is this morning.

[Superfly Guy]

Ok, this deffo not a slipping clutch, game it a good beasting through gears 1 - 3 and no hint of slipping.

[Dangerousfish]

No sign of hesitation or juddering at all?

[Superfly Guy]

No sign of hesitation or juddering at all?

Nope, power delivery is as normal. All very strange.

[Dangerousfish]

Possible air leak?

[Superfly Guy]

Strange that it only happened on the return leg of a journey and in 6th at around 65-70 mph. Il have to take a drive out to and see if I can recreate again and video the rev counter.

[lfcrule1972]

Does it feel like an electronic jitter ? Like the ECU is having a fart in that particular scenario ?

[Jamie@SPTuning]

Sounds like clutch slip to me, like with diesels these can slip in high gears with high torque output cars. @3000rpm your right in the middle of your peak torque....put money on it

[DaveB]

I think it's the early stages of clutch failure. If the revs are rising momentarily with no corresponding increase in speed there can't really be any other cause that I can think of.

When the clutch went on my Peugeot 405 the first symptom I noticed was slip at motorway speeds in 5th.

[Superfly Guy]

Sounds like clutch slip to me, like with diesels these can slip in high gears with high torque output cars. @3000rpm your right in the middle of your peak torque....put money on it

Thing is Jamie I gave it some welley around her this morning and no suggestion of slip in 1st to 3rd. When it happened in 6th I wasn't flooring it, just accelerating.

[DaveB]

Try this:

Car stationary, handbrake firmly on, put it in 2nd gear, clutch down, hold the revs at around 3,000 & release the clutch gently. If the clutch is OK, the engine will stall immediately.