307 2.0 HDi 2007 boost control hissing
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  1. #1
    Member Hugh Venables's Avatar
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    Default 307 2.0 HDi 2007 boost control hissing

    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.

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    Last edited by Hugh Venables; 14th February 2018 at 09:46 PM. Reason: added clarity, I hope

  2. #2
    1000+ Posts Gamma's Avatar
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    No expert here but....
    Check the vac unit off the LHS of the head, (looking into the engine bay...) and then trace the hoses down to the two vac solenoids....they might need changing or there is a tear in a line????

    Or the EGR...but a serious leak around there will limit the get up and go.....
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  3. #3
    Member Hugh Venables's Avatar
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    Thanks Gamma, but I don't think I'm looking for a vacuum leak. It's quite a loud hiss and the performance is not affected at all.
    Hugh

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    Im presuming he saying its the vac that boost the brakes ,could be interesting towing a caravan, pugs

  5. #5
    Member Hugh Venables's Avatar
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    The brakes are not affected either. I don't think it is any sort of vacuum leak or a control problem. When the turbo boost is being controlled, the excessive air being dumped from between the turbo and the inlet manifold is leaking to atmosphere where it can be heard instead of being ducted back to the ducting on the inlet side of the turbo. There's a guy at Alpine Affair in Ringwood who seems to know these very well. It's booked in for him to have a look/listen on Tuesday.
    Hugh.

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    WE HAVE TWO 307 HDIs IN THE FAMILY ATM AND A CITROEN PICCASO WITH THE SAME ENGINE, SO AM INTERESTED TO HEAR ABOUT ANY IDIOSYNCRASIES AND THINGS TO WATCH OUT FOR, KEEP US POSTED,, PUGS

  7. #7
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by pugwash View Post
    WE HAVE TWO 307 HDIs IN THE FAMILY ATM AND A CITROEN PICCASO WITH THE SAME ENGINE, SO AM INTERESTED TO HEAR ABOUT ANY IDIOSYNCRASIES AND THINGS TO WATCH OUT FOR, KEEP US POSTED,, PUGS
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  8. #8
    Member Hugh Venables's Avatar
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    Di took the car to Alpine Affaire and they spent some time driving and put it on a hoist but were unable to diagnose without dismantling. They didn't think it was doing any harm or losing any power and didn't charge. If I could find an engine out of the car I might be able to see what it might be and where to start. The back of the engine is extremely inaccessible. Strangely the sound seems to come from the extreme left side of the engine bay when the turbo plumbing is mostly behind the engine. Maybe I might see something if I pull out the battery box.
    Hugh.

  9. #9
    Member Hugh Venables's Avatar
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    It's still the same. I reckon it was quiet one day and noisy the next and the noise level has not changed since it started. The performance is still not affected at all. Had to replace the battery the other day and had a look down the back with a mirror and had a feel but no inspiration, it's too tightly packed in there. I suppose we either pull a lot of stuff out, maybe the engine or put up with a bit of noise. Actually, I think I might be getting used to it!

  10. #10
    Member Hugh Venables's Avatar
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    Does anyone out there know if the boost is controlled on the exhaust side or the fresh air side? Could I be wrong in deducing that it is boost control that is leaking?
    Thanks,
    Hugh.

  11. #11
    Member Hugh Venables's Avatar
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    Still no resolution to this. The turbo is controlled by varying the vane angles, not by any sort of waste gate or other gas pressure relief. It has been on a dyno with the windscreen wiper panel and engine cover removed. They could hear the hiss clearly but couldn't find it without further dismantling. I don't think it is much louder if at all than when it started. It doesn't seem to cause any other problem. A smoke test might be worthwhile but it is so tightly packaged that the smoke leak source would probably be difficult to find. Any suggestions welcome.
    Hugh.

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