Okay so I have finally got round to working out the next steps with my D5185 bhp. I currently have three Volvo XC 90 and I’m working on them every weekend to keep them going!!
So I have done extensive testing and I have now also replaced the intercooler and I can guarantee there are no boost leaks.
I have set up VIDA and driven the car for 100 miles testing causes for “Soot filter full” message.
1) Boost pressure is constant and in line with required values.
2) The car is automatically regenning and removing the particles recorded. I’ve seen the value go up to 29 and then reduce down to 0 when driving. The regen cycle works well and of course when driving at a constant motorway speed the soot value goes up to 6 or seven and then automatically gets burnt back down to 0.
3) I have already replaced the DPF pressure sensor. When I did so, I blew down the pipes to ensure they were clear and not blocked.
4) If you look at the attached picture you will see the bottom to veins of the intercooler are bent downwards as they have been over pressurised.
It’s my summarisation then that because the car has been burning oil, for a long time prior to me buying probably, the DPF is just knackered.
I hear you say that you need to sort out oil leak/burning of oil in the engine but, in consideration that I have done all the work noted at the start of this post, I am going to assume that the DPF may have been damaged Or just completely blocked up to the point that it cannot turn off enough soot to clear the system.
Lastly, when driving I can avoid the filter message if I drive very slowly and keep the revs down and the boost pressure down. The minute I put my foot down the soot filter warning comes up. This Message comes up with the KPA values from the filter when they hit about 600 Which I believe is far too high and the causation of the low power/limp mode and the soot filter message.
So a new DPF is being delivered today with fixing kit and a new temperature sensor (just in case the old one does not come out of the DPF.) Considering that it’s such an important part of the engine, the cost is only £110 which really surprised me.
I will let you know an update when I drive the car with it fitted. I’m not completely sure that this message will now disappear as the car is still burning some oil. However, with the right oil in the engine (low sulphur ) I hopeful This might resolve the issue for me.
Any comments on the KPA you should be getting when the engine is revved? My number is about 70-140 on Idol / low revs and up to 600 hard revving/engine under load.
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