2004 Renault Scenic injector fault

Best to get car in for a diagnostic scan and see what shows .

I took the car to a Renault garage and the problem didnt come up, 6 others did and they were cleared but my problem remained.

I had this fault; it was excessive return leakage from one or more of the injectors, which causes a pressure drop in the common rail during heavy loading, such as high speed, acceleration, climbing hills, etc. Remove the plastic return pipes from the injectors output return and place 4 long lengths of plastic pipe on to the injector output return; place the pipe ends into 4 separate jam jars start the engine and monitor the return flow; after a short time check the level in the jam jars; the offending injector will have a lot more return fuel in it’s jar then the others. Replace the offending injector this should cure your problem.