Our 2007 307 2.0HDi has started making a hissing sound when the boost is being controlled. The car's performance is not affected at all. When accelerating hard there is very little noise but as I ease off the hissing sound becomes louder. It is loudest on light to moderate engine load. If you use engine braking to slow down there is some hissing too. I assume there is a duct/pipe/hose from the boost control valve to the turbo inlet that is leaking. It is extremely difficult to see any of that behind the engine. Is anyone familiar with the back of the engine to make any suggestions? How difficult is this going to be to fix? I worked it pretty hard last weekend with the caravan and it doesn't seem to be getting any worse or causing any other problem.
Thanks,
Hugh.
Thanks,
Hugh.
Last edited: