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Discussion Starter #1
Hi all,

We have had our '07 C-Max for about two years and it has been great. It's a 2.0 litre petrol automatic.

However over the last month we have had some issues that have escalated in the last week or so.

A few weeks ago both my wife and I started to notice the car was juddering/wobbling under acceleration. Nothing too extreme, but it could be felt through the seat and steering wheel. It seemed to be most noticeable when the car was under load - for example accelerating up a slip road on an incline to join a motorway.

We got our local garage to take a look and they were a bit stumped. They said there was a small amount of play in the driver side driveshaft, but they weren't convinced it was enough to explain the behaviour.

Under their recommendation we booked the car into an auto box specialist last Weds for them to road test and inspect the car. However before that appointment, it suddenly got a lot worse to the point where the car was actually shaking at about 50mph and above.

We still took it to them, and they agreed with our local garage that the driveshafts needed replacing. They said they were able to turn the wheel a quarter of a turn due to free play and recommended we don't drive it until fixed.

Our local garage have today replaced both driveshafts but the problem still remains.

It is definitely improved over the shaking we experienced last week - driving the car at 50mph is no longer terrifying. However we can still feel the juddering at slow speeds and it feels like we're back to where we were three weeks ago.

My concern is that the play in the driveshaft was a consequence rather than a cause, and that if we continue driving it then it will simply happen again.

Does anyone have any clue what this could be from previous experience?

Obviously we will take the car back to both our local garage and the auto specialist, but thought someone on here might have had this themselves.

Apart from the juddering the engine performance seems good, it's responsive and accelerates well.

Sorry for the long post, but it has been a long saga.

Any advice would be massively appreciated.

Cheers,

Chris
 

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Discussion Starter #5
If it was a misfire, am I right in thinking we would have a loss of power? Because that is certainly not the case.

Also would that be an obvious diagnosis for a decent mechanic?
 

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Discussion Starter #8
Hi everyone and thanks for all your replies.

Today we had the car examined by an automatic specialist in Titchfield, Hampshire (Crucial Automatics). Following some extensive diagnostics they have informed us that the transmission fluid is contaminated with coolant from the engine.

Apparently this has most likely happened in the radiator - both the ATF and engine coolant run through separate tanks in the radiator and damage or corrosion can result in cross contamination.

This contamination in turn corrodes the friction lining of the transmission and initially manifests itself in the torque converter, which is what causes the juddering we have experienced.

They could dismantle and repair the transmission - this was estimated at around £2,000. Alternatively we could try and source a replacement transmission from somewhere - they guessed that with fitting it would be around £1,200.

Considering the car is probably worth less than £1,500, we have decided it is time to say goodbye. It will either be sold for scrap or as a non-runner for parts.

We can continue to drive the car for now. The issue will gradually get worse until at some point it will fail to change gear (and most likely default to being stuck in 3rd). It could be days, weeks, or months.

Thanks again for your suggestions and I hope that putting this here will be useful to someone in the future!

Chris
 

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Sorry to hear this after you put parts and money into the fault. I suppose conversion to manual is too big a task on a £1500 value car?
Thanks for coming back with the final result though.
 

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Hi all,

We have had our '07 C-Max for about two years and it has been great. It's a 2.0 litre petrol automatic.

However over the last month we have had some issues that have escalated in the last week or so.

A few weeks ago both my wife and I started to notice the car was juddering/wobbling under acceleration. Nothing too extreme, but it could be felt through the seat and steering wheel. It seemed to be most noticeable when the car was under load - for example accelerating up a slip road on an incline to join a motorway.

We got our local garage to take a look and they were a bit stumped. They said there was a small amount of play in the driver side driveshaft, but they weren't convinced it was enough to explain the behaviour.

Under their recommendation we booked the car into an auto box specialist last Weds for them to road test and inspect the car. However before that appointment, it suddenly got a lot worse to the point where the car was actually shaking at about 50mph and above.

We still took it to them, and they agreed with our local garage that the driveshafts needed replacing. They said they were able to turn the wheel a quarter of a turn due to free play and recommended we don't drive it until fixed.

Our local garage have today replaced both driveshafts but the problem still remains.

It is definitely improved over the shaking we experienced last week - driving the car at 50mph is no longer terrifying. However we can still feel the juddering at slow speeds and it feels like we're back to where we were three weeks ago.

My concern is that the play in the driveshaft was a consequence rather than a cause, and that if we continue driving it then it will simply happen again.

Does anyone have any clue what this could be from previous experience?

Obviously we will take the car back to both our local garage and the auto specialist, but thought someone on here might have had this themselves.

Apart from the juddering the engine performance seems good, it's responsive and accelerates well.

Sorry for the long post, but it has been a long saga.

Any advice would be massively appreciated.

Cheers,

Chris
I know this was some time ago now, but did you find it started to happen after the car was "warmed up" and then at around 60 initially? but then at lower speeds?
 
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