It has already had the TDC sensor replaced. The fuel pump appears to pump (listening to the noise). The fuel pump relay has worked when tested. The throttel body appears to collect oil, as far as I can see from the engine breather tube that joins the air intake from the air cleaner to the throttle. The oil then drops and floods the air temp sensor, but this has been cleaned already. Although I see in other discssions with similar issues, there have been suggestions to replace the CTS (coolant temp sensor), so far I have resisted this as I cannot see how this could be the cause. I did read in the Haynes manual that any malfunction of these sensors and the ECU would revert to 'backup' mode where the engine would still function in a less efficient manner - but would also show a warning light, which this car doesn't. Other folks have suggested the Idle control stepper motor, but idling is not a problem, it either works fine, or it just wont run at all. Generally fails at busy junctions at traffic lights, or at large roundabouts. Suggestions would be much appreciated as this car needs to be sorted or it will go to meet its maker - finally.

I have just purchased a 2012 Clio that has an intermittent non-start problem. I was sold it with the manufacturing fault and to date Renault have been unable to provide a solution. I understand your frustration about the car not having the fault when someone looks at it. I have had the diagnostics run on the car but if the fault doesn't occur at that time then it is not picked up. Along with this fault I also have the issue of the car hesitating when accelerating as if the fuel is not getting through and then suddenly shooting off when the fuel does get through(particularly noticable in 2nd gear). It seems like this is a common fault in Clio's as I have seen numerous stories relating to this type of fault. I would be interested to know if anyone else has a new Clio with the same fault.