Lumpy idle disappears above 2k revs.

could be an injector or pump fault,get a diagnostic run to check fault codes and sensor readings

Could check this re. water / corrosion getting to injector from washer jet.


C3 Misfire
27 February 2010, 6:52 PM bigtony
Joined 12 Jan 2005
852 posts


hi. ive done quite a few of these. cylinder 4 is the cylinder nearest to the timing belt, (french, backwards) you will prob find the injector connector is corroded up. most times the corrosion has got into the injector and a new one is required. the other fault codes you have could be to do with the missfire. but a suspect coil pack sounds more like it. Ive come across this b4 too on these.sorry of this post is a bit late for you .
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C3 Misfire
3 March 2010, 0:55 AM ian
Joined 16 Sep 2006
930 posts


water drips from the drivers washer jet onto the injector causing the corrosion as tony said. there is a mod kit for the washer jet. its a rubber seal and a washer but a bit silicone around the base of the jet works just as well.

Hope this helps you .

being a 1.4 hdi i wouldnt have thought it had a coil pack.May have an egr fault

After reading various reviews on my motherinlaws citreon c3, with the problem of lumpy running and cutting out at junctions, I was shocked at the thought of replacing injectors at the cost of £300 plus. I decided to try an injector cleaner, being Pro Tec Fuel Line Cleaner. The salesman advised me to put this in with no more than a quarter of a tank of fuel and then to run the car as much as possible. Now, 5 days on and after refuelling, this appears to have rectified the problem. I feel this is worth a try before going on to a greater cost solution.