I bought a 2006 V70 2.4 D5, 120kW/163hp, it was too cheap to pass. I was recommended to post here, hopefully someone knows a little more about these engines than me. I’m trying to learn.
I thought I fixed all it’s problems but now that it’s registered, it starts ****ing with me again. When I bought it the engine was in limp mode, I suspected the swirl flaps because the link was disconnected.
Sorry for the long story but I feel like I have to explain what’s happening here.
problem right after I got it: you would delete all fault codes and it runs fine, no faults reappearing. When you floor it while driving, it goes up to 3,5/4k rpm, then cuts out and dies. Feels like a fuel cut and it probably is, you could start it right up and it was in limp mode.
I changed the fuel filter and checked the lines and somehow it worked, I could completely floor it through second and third gear and all seemed fine. I then started addressing other issues, oil, filters, leaking and broken swirl flap, leaking valve cover gasket, deleted the swirl flaps completely while at it, also changed timing and auxiliary belt, including water pump. You have to remove the injectors to get the valve cover off so new injector seals, clamps and screws have been used. All seemed to work fine.
I registered it and the problem appeared again. Exactly like it was before.
Now the only difference is that after it dies it won’t start unless you turn it completely off and let it sit for 2-3 minutes. It starts right up and doesn’t go into limp mode, seems to run fine. When I checked for fault codes afterwards it showed two codes for low fuel pressure (2520 and 2530, tester code) which seems to be the pressure before the high pressure pump and the second code for low pressure in the return line, honestly no idea how that works and not sure where these measurements are taken from.
Fuel pump in the tank seems to work, but I’m not able to measure the fuel pressure of that pump manually at the moment.
The tester can read out fuel pressure in the rail, which reads about 350 bar idling and around 500-700 bar revving. When driving it goes up to 800-1000 bar depending on the load demanded.
Is my rail pressure too low? Wikipedia says this engine should work at up to 1600 bar.
When the fuel cut happens the pressure just drops to zero, no weakness before it cuts out, like the ecm just doesn’t like what’s happening. Maybe I’ll have to mention that the previous owner also had the dpf emptied because he only did short distance trips for the last years. Does it need software adaptation because there’s no dpf?
Now today I wanted to change the fuel pump in the tank hoping that could change the issue. It was a really dirty job only to realize I got the wrong fuel pump for the car. Thinking about it I believe the fuel pump would be unlikely to be the culprit but I refuse to believe the high pressure fuel pump is shot or is it? I ordered a new fuel pressure regulator, but honestly at this point I’m just guessing and throwing parts at it. I almost ordered a renewed high pressure pump but I’d like to diagnose the problem properly instead of guessing.
What have I gotten myself into? Is there another approach to this problem? Anything to check? Any ideas? If you kept reading up to this point just give me anything you have in mind.
Thanks, love to all of you.