Volvo Owners Club Forum - V70 D5 185BHP Cutting out during boost

Hi All
Could I please pick your brains...
I have a Volvo V70 D5 its an 2007 plate with 240K miles on of which I have put 160K. Its been a fantastic car and I dont want to have to scrap it but I am close to it now, as its been off the road for 6 months now..

So the issue is the car cuts out under load drives ok pottering around town and even on the motorway as long as I am not too heavy with the right foot. It is much more noticable when accelerating up a hill....

Back in December car had reduced power while I was driving along the motorway, I was dropping down to 4th up hills and fifth for cruising, it did have a large trailer on the back. Once I left the motorway car cut out and would not start again.

I thought blocked fuel filter so dropped that out and it still would not start, I could hear the tank pump so assumed that the HP fuel pump had failed on me..... I got recovered 200 miles home.... :(

I changed the HP fuel pump issue still existed, eventually I changed the common rail sensor and the car at least run at that point. She would not rev though much past 2000 rpm. I also changed the rear tank pump too. I have also changed the Common Rail pressure regulator.

I had a mobile mechanic look at he got her running but not very well, he said it needed a turbo, so I bought a warranted SH turbo and he fitted it I changed the intercooler as well as the seals had gone on the old turbo after 240K miles of driving enjoyment. The old intercooler did have a hole in it so I was losing boost.

So with the new turbo and intercooler she pulls like a steam train but cuts out now.... Nothing in the diagnostics other than swirl flaps, these had been disconnected for around 100K miles and 5 years. Swirl flaps are now tied open.

I have had 4 mechanics look at it 3 saying swirl flaps as only thing in the diagnostics, I think i might question them as mechanics really. Swirl flaps would not cause the engine to completely cut out just affect economy and performance.

So today I took it to the 4th mechanic he seems to know what he is talking about and has done a lot on my cars in the past, he is just 50 miles away so had been using local mechanics. He seems to think its something to do with the boost pressure and may be over boost. Only way to diagnose would be measuring the boost on gauges and the car on a rolling road. This is going to cost a fortune on a car that is probably only worth £1,000.

I am thinking it might be the boost control valve, now that the intercooler is fixed and seals on turbo are good again. But would the boost control valve failing actually cut the engine out on the car or just put it into limp home mode.

I have taken some plots with Delphi, this shows what is happening when the engine cuts out. it cut out 4 times during the drive, my lad was supposed to mark them in the file but only managed to press it twice, which are the red line markers... Can anyone who is able to interpret these graphs tell me what the possible issue could be please....

This shows the graphs from the flight mode taken while driving and cutting out there is 4 engine cut outs but my lad only managed to mark 2 of them they are designated by the red bar on the graphs.
https://1drv.ms/v/s!AkXW9f_bewsNjm7z...VqgK1?e=iAsHvy

I dont know what to look at next or which way to turn would be a shame to scrap her just because I cant find this fault.... Engine is in good order no smoke uses no oil, plus I have just spent £500 on turbo/pumps/intercooler and bits...

If anyone has any ideas I am all ears.....

Many Thanks inadvance...

Darren