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[JamesV6CDX]

Serek, boost pressure code is 5232, pre supply fuel code is 4704

[Broomies Mate]

My level of Diesel engined car's is nil.  However, I have experience of Turbo vehicles.

Check ALL hoses.  Anything slightly weak can contract 'on boost' causing the ECU to see a problem.

[Sir Tigger KC]

My level of Diesel engined car's is nil.  However, I have experience of Turbo vehicles.

Check ALL hoses.  Anything slightly weak can contract 'on boost' causing the ECU to see a problem.

Yes this is why I think it's something fairly simple like a weak joint somewhere.  I had similar issues with my old Merc C250TD, which started and ran fine with a full tank or parked facing downhill, but didn't like starting and was down on power otherwise.

I don't know zip about Jame's BMW engine to be honest, but I replaced all the low pressure fuel pipes and seals on my Merc and that solved the problem.  It cost about £60 but only because I changed the plastic pipes which had become hard and brittle.  I probably could have got away with just changing all the O rings for just a couple of quid! 

On the Merc it was a quick and easy job and I reckon it's worth a try before spending out on new pumps etc, and just because you can't see a fuel leak that dosn't mean that air isn't leaking into the system. 

[Kevin Wood]

The car only properly misbehaves (and logs codes) with less than quarter of a tank..

I'm starting to suspect the in-tank lift pump. As opposed to the inline pump under the car?

Sounds plausible. If it's sensitive to fuel level in the tank, it can't be anything much further upstream.

I just can't see a physical turbo problem. If there was a turbo fault, why does it fly at half throttle, but is less rapid at WOT?

As Jason says, it's because the ECU sees too much boost, and backs off the fuel quantity to a "get you home" value to protect the engine. At half throttle, the boot pressure is limited by your right foot, so no problem.

I can't see how this can be related to a fuel supply issue. I think you have two problems.

[JamesV6CDX]

Lift pump in the tank changed today.

Fuel pressure at idle has now risen to the expected 4 bar, not dropping below 3.5 even under demand. Which is correct operation (it was dropping under 2 bar!)

I've yet to road test but looking good (other than I stink of diesel!)

Ref the turbo possible issue, there are an array of vaccum pipes which feel very soft and in poor condition, I shall replace them all and report back.

Now starts first time too, whereas before she'd really struggle under quarter a tank

[Omegatoy]

Great news James!!
thing that gets me is its exactly the same symptoms as an Omega td when it gets to a quarter tank
lol

[Shackeng]

Great news James!!
thing that gets me is its exactly the same symptoms as an Omega td when it gets to a quarter tank
lol

Not with mine!