Seems your suffering from the EGR issue. A well known issue that even I have suffered from.
Using the search button at the top of the page, search for EGR as there is plenty to read.

 

I'm not sure about it being the EGR
My thoughts to shoot down if relavent
It's not been an oft recurring problem that has been mentioned in respect to the 1.6 TDCI

On the asumption that the control parameters for the EGR (throttle position as a major one) before the loss of power, during it, and after it didn't change then the EGR position should not have changed either

I have the thought it is electrical

 

hi ,i also have a 1.6tdci ghia 2005 i have also experianced this problem ,on taking it to fords main dealers because nationwide could not find or repair the vault ,having put on dianostic machine found the the fault being a pipe from the turbo allowing contaminated oil backing up onto senor,speaking to fords direct (technical dept) because technician told me that this was a call back ,technical told me that only changed pipe if problem occured within warrrenty period

 

Thanks for the thoughts just to add some more info. When driving along it seems to be when throttle is constant. It almost feels like the brakes are applied for a split second with a noticeable drop in forward momentum but only lasts a second and back to normal. Also not sure if it is connected to a possible electrical problem but when i turn the steering quickly my headlights brighten quite a bit. When i mentioned this to Ford garage at my last service they said they upgraded my engine management software and this will fix it but it didn't. People with EGR problems mentioned total loss of drive for sometimes a while with real juddering I don't get that just a brief loss. I have never had any warning lights come up at all.
Any help much appreciated before resorting to the garageEdited by: bammers

 

Lights going brighter is normally a battery / alternator type of fault.

Turning the steering quickly causes the steering angle sensor to get the steering pump to spin faster to apply more power assistance to the steering which would probably require an increase in required engine power which could be the reason for the lights but not necessarily the underlying cause

 

hi mate
did you get this problem sorted and what did you do and how nuch did it cost reason for asking is that i noticed oil in my air filter which seems as though its coming from the turbo
thanks

 

Which side of the filter is the oil?
Considering that whatever the output from the turbo that the flow of air ought to be in the other direction (from filter to engine) oil in the filter from the turbo is a little strange

 

I've had this on mine, seems to just drop in power for a second, usually whenacceleratingaround the 2000 rev range.Today I was driving home when the dreaded red light came on with 'Engine System Fault' on the display.AA came out and his diagnostic computer brought up1101P1757P0101P0299P0562
The gist of these were 'low voltage', 'something to do with airflow', 'something to do with the turbo pressure' and ,something to do with the throttle position being misaligned with what the sensor was recording. (sorry for the vagueness)
Anyway he reset the codes and they cleared, so I went on my way home. It came back on for a minute but cleared again. Need to give Ford a call on Monday.
Recently the exhaust sounds to be blowing/leaking somewhere too if you ask me.
Anyway some of the things mentioned here (turbo/air filter/loss of power/throttle) are consistent with my problem so thought I'd add my 2p worth.

 

hi Pete did u get it sorted out it sounds its the seem problem i am having .i have 55 plate

 

The exhaust can crack above and below the large chamber in the exhaust right next to the engine. I forget the name of it.....if the exhaust was a snake it looks like it's swapped a large pill.
Reset the ECU (disconnect battery for 30mins) and have a go again if you haven't done it already. My bet is dodgy sensor somewhere though.

 

I have a 2005 1.6 tdci C-Max, had this problem! took it to garage for them to tell me turbo is knackered as is MAF sensor as "pipe" from turbo is kicking up oil from the turbo.... £1000 later and its still doing the same thing..... been told there is wear on the top of the engine too and back pressure coming from it! not completely clued up on all this but previously had cam sensor changed too!! found that if i disconnect the MAF sensor the problem disappears completely!!! which you would assume faulty MAF but its brand new! ?? ahhhhhhhhh ive had enough!!...