Hi just thought I'd share my recent experience that may save people time and money. I was being plagued with a loss of power/hesitation around 2300 rpm. I read around the subject and being a tight Yorkshireman became quite worried about how much a fix would cost. I therefore decided to do what I could to sort the issue before lining the pockets of a Renault dealer.
valve, this was easily located and removed ( 3x 11mm bolts) It was found to be heavily soiled (black soot) I cleaned it using carburettor spray cleaner (£5) and a soft tooth brush - total time 20mins
Secondly I located and removed the
unit, not much to look at here but under a bright light I could see evidence of tarnishing on the internal elements, a quick spray with carburettor cleaner and a clean with an soft pipe-cleaner and everything sparkled - total time 20mins.
I took the opportunity to replace the air filter (£15 oe) which was fairly well clogged.
The result - after 2 weeks of hesitation and worrying about
failure etc, the car runs smoother than ever and all for 1hrs work and £20 expense. The mpg is back to 50mpg as it was when I first purchased the car
I now intend to change the oil and oil filter every 6k miles and clean the EGR at the same time all of which I think will prevent the dreaded turbo failure I have read so much about!