Hi,
About to get by C5 serviced. One thing I've noticed for quite some time is that, if I accelerate fairly hard from lowish/medium revs - especially it seems in 4th-5th gear, as you would if you're overtaking (and using the diesel's torque) - the revs sometimes initially rise without any increase in speed before they drop back to normal. It doesn't always do it and doesn't seem very dramatic, just very odd when it does. Had no juddering clutch when pulling away and I'd generally consider I'm fairly kind to the car.
Anybody any suggestions what it might be? I initially assumed it to be a slipping clutch which I thought odd considering I first noticed it when it had done about 20k miles not long after I bought it, it's now done 32k and not got any worse. With all the interest about dual mass flyweels on this site and in the DT I started to wonder if it was that. I'd like to be armed with some advice before it goes in for its service - I've asked them to check this - in case it's something that can be fixed under warranty.
Thanks!
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Edited by Dynamic Dave on 27/05/2008 at 13:41
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Yes I have the same clutch slipping problem on same model. Quoted over £700 (today) to fix, although advised I could leave it a while. Car still under warranty, but told clutch only covered up to 15,000 miles. I have done 28,000 in just under three years. I would also appreciate any other comments on their experience with this.
Very pleased with the car in all other respects. I have had the rear door replaced because rubber seal splitting away. The only solution was a complete rear window because the seal is integral with the glass. The rear HI light kept falling off from new - even on the replacement window, until finally fixed with some decent glue!
Touch wood - that is it!
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I have the same problem in my 08 New C5 2.0HDi 138hp Exclusive. If I accelerate hard in 4th or 5th gear at around 2000rpm the revs occasionally rise rapidly to about 2800 before dropping back to normal. it seems like a slipping clutch but the fault is not constant. I reported it to my dealer and they couldn't replicate the fault nor could they find anything wrong. Just prior to the 20,000 mile service this week (the problem started at around 19000 miles) I took a mechanic from the dealer out with me to show him what happens and yes, you've guessed it, I couldn't get the car to do it at all! Of course as soon as I collected it after the service, it did it all the way home.
You say you were quoted £700 to fix the problem - was this to replace the clutch?
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I'd suggest making sure the car is up to temperature when testing. As you say, 2000 rpm is the point where the clutch is most likely to slip, being roughly where max torque is.
Does it slip in 6th gear? In 6th the engine works harder to turn the wheels, but at speed fuel is saved because the engine is closer to max torque than in 5th gear.
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I don't think that the engine temperature is a major factor because although it can appear to be slipping more when cold, it still does it when fully warmed up. With regard to slipping in 6th gear, I'm sure it's done it once or twice at motorway speed but it's nowhere near as apparent - I'll check over the next few days.
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Yes, I can get the clutch to slip in 6th gear - the circumstances are the same ie when I accelerate hard at 2000 rpm, the revs rise then fall before the car pulls as expected. Of course, this doesn't happen every time and as in fourth and fifth gears, I can't confidently predict when it will.
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I have the same model of car, on a 55 plate. I've had this problem fixed twice under warranty - and it seems to be happening again now. In both cases it was a faulty oil seal and the friction plate was contaminated.
I don't know why it sometimes goes for days without any problem then one day plays up every time you accelerate. In my case it has always failed in colder months.
The fact that the new seal only last 10 to 20000 miles implies (in my opinion) that there is a design fault - either the seal hole-shaft alignment, ovality of the shaft/hole or the seal itself.
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Thanks for the information - I must confess that I've only just revisited the site tonight out of curiousity as back in August 09, I thought that no-one else had anything to add. I still have the problem but I can now go to my dealer with a positive suggestion as to what may be causing it.
Edited by adrc5 on 11/04/2010 at 22:05
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Thanks for the information - I must confess that I've only just revisited the site tonight out of curiousity as back in August 09, I thought that no-one else had anything to add. I still have the problem but I can now go to my dealer with a positive suggestion as to what may be causing it.
I now have the same sort of problem, accelerate in either 4th, 5th or 6th gear and it feels as though the clutch is slipping. My car is booked into a main dealer for inspection and I have been told I must ok any work carried out in case it is classed as "wear and tear". The car is 2 years old with 30k on the clock. Could you let me know how you have faired if/when you have taken it to a dealer?
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This time the dealer was finally able to experience the clutch slip effect and I supplied a copy of all of the previous correspondence about the subject from the website. This was enough to persuade them to book the car in for 3 days for gearbox removal. They were able to confirm that it did have a defective oil seal and a contaminated friction plate and I was told that they replaced the whole clutch assembly. So far, there has been no repetition of the slippage...........my thanks to all contributors!
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