IF the air in the fuel lines is excessive, it may be that the fuel filter housing is letting air by. There was a special notice for Fraud fitters about this and a replacement housing was the answer. Having said that I have owned my 2006 2.0TD since 33k and its always shown some small amount of air in the clear lines and never had a problem from it.
I would suggest maybe disconnecting the battery for 10mins (make sure you have the radio code) and then the cpu will have to relearn your driving style. A good thrashing after a relearn to clear the cobwebs might help too if like mine it was driven by miss daisy at 20mph everywhere. good luck!

 

Thanks for replying. Before I scrapped the old one I ran them up together and the old CMAX had no air in the fuel pipe so that's what I was using for comparison. I will try your what you suggested with the battery. I'm hoping it does just need a good canning as I suspect it had just been poodled around in. I'm seeing lots of ads for DPF cleaning. Is this worth having done?

 

Try changing the fuel filter. This will allow you to inspect the housing and make sure all connections are tight (as well as renewing the seal) then go from there. I personally would have thought the lack of power is more likely due to gummed up turbo vanes than anything else. Maybe a temporary blanking of the EGR pipe may rule out another possible cause (that will probably put an engine light on).

 

Thanks. I might try Wynns turbo cleaner after I have done the fuel filter.

Anyone ever tried it?

 

So it's in the garage this morning and they found this.....

 

Cant view attachment.

 

Ok.

P0299 boost pressure control Charge air pressure too low.

P2263 boost pressure control malfunction

P242F Particulate Filter. Ash content not OK.

So the mechanic has done a DPF regeneration and he says all the errors have cleared and it now has boost. I hope that stays that way.
He not got to the air bubbles issue yet but is replacing the fuel filter tomorrow.

 

Update: - Car back from Service. DPF regen and needed a new intercooler!! Fuel filter replaced (Still got bubbles in fuel line) but running ok. Had one error P2263 reappear and i lost boost. After stop and restarting, error cleared and got boost back.Done 500 miles of mixed driving since and error P2263 not reoccurred....hopefully it wont! running a few tanks of VPower through it as the car was standing for a long time before i purchased it and was only doing 4 - 5K a year around Cornwall.