Misfiring/juddering 1.6 Diesel

Hi guys

I have owned an 06 1.6 C3 Diesel for approx 3 months. It has a problem that I struggle to describe. The car has 55,000 miles on the clock and a full service history.

Once warmed up it does this thing similar to what would happen if I had suddenly/rapidly put it into reverse gear then out again. If I continue to drive it will start doing this more regularly then eventually do it in quick succession and a couple of times this has culminated in a complete loss of power and a breakdown. After a while it will come back to life and I am able to proceed.

It can do this at any random point but it seems to be more likely if I am driving uphill. 99% of these incidents have been once the engine has fully warmed up; after approx 10 minutes of driving.

The RAC checked it and on their advice a new crankshaft speed sensor was fitted.

It has been back to the same garage, RAC approved, twice now with the same problem and they cannot find the fault/any more faults. They took it for a test drive and, of course, the problem didn't happen. Then I jump in to take it home and, of course, I don't make it half a mile away from the garage and it happens.

I have searched the forum and this was the closest I could find from other users is this



With this product as a suggestion:

https://www.ebay.co.uk/sch/i.html?_odkw=millers+diesel+power+ecomax

______

The car drives beautifully outside of this one problem and I absolutely love it. It has years of life left in it and has been very well maintained and looked after. The judder seems less pronounced/severe since the new crankshaft sensor was fitted but otherwise is exactly the same as before. It is absolutely horrible when it happens and makes me jump out of my skin.

I am at a bit of a loss over what is happening and would very much appreciate any help or advice.

Kindest regards

uknleo

Read the codes stored please.

Best way to do that is, read the codes and remove any that will and note the ones that don't (full details, not a 'it may have said..)

Then run the car around until it happens again

And read the new codes and make a full record of them

Post the codes as a reply.


Use lexia tool or even a cheap OBD2 scanner to read the codes.


Without the fresh codes it won't be possible to diagnose the fault.

I have no idea what you mean but I'll research it and find out. When the RAC came to my house they used a computer to get the data from the car and that was why I took it to their recommended garage to have a new crankshaft sensor fitted. That same garage told me earlier today that there was no more electronic fault data and that they had no idea why the fault was still persisting. If that helps at all.

Thanks for your reply. I will follow those links and try and do as you have asked.

uknleo wrote: ↑Tue Jul 07, 2020 4:13 pm I have no idea what you mean but I'll research it and find out. When the RAC came to my house they used a computer to get the data from the car and that was why I took it to their recommended garage to have a new crankshaft sensor fitted. That same garage told me earlier today that there was no more electronic fault data and that they had no idea why the fault was still persisting. If that helps at all.

Thanks for your reply. I will follow those links and try and do as you have asked.

The C3 records faults as they occur as you drive. Some are minor that you may not even notice, some are more serious like the one you describe. Some are permanent and some are intermittent.

The links take you to a computer/device than can read those codes (one is cheap and limited, but easy to use, the other is more involved but much more in-depth and more likely to find the problem).

You need to read the codes again.

Start from a clean sheet and read the codes that have been stored after the misfire/event occurred. These codes may or my not be the same that the garage read, but without checking for new codes and reading their value, it won't be possible to diagnose it remotely.

There is only one problem with the codes and a fault like the one you have is that a major electrical power outage (like a bad battery connection / loose earth lead) will cause a major symptom/misfire/judder, but a code will not be stored.

So a fresh code read is required, old codes cleared, the fault to happen as you drive and the codes read again to see what (if anything is stored).

From this point it can be possible to make some suggestions on what parts to investigate/test/replace.

Thank you very much. I have read your links and follow up comment and everything makes much more sense now. This is the first time I have owned a car like this with onboard computers so have limited experience. I am very poor.

I will act on your advice and will try and grab your attention when I come back with the info you need.

Thank you very much for your help.