Fuel delivery problem 2006 V70 ... Help

[MikeQ]

Hi, I have a 2006 V70 turbo and it started running rough recently and giving me check engine message.

I took it to the shop and they changed fuel pressure sensor but the same problems started right after I left the shop.

Now mass air sensor ahs been changed and it is still giving me problems.

It runs slightly rough and sometimes gives me a hard time starting but will start eventually if i I apply gas while starting.

Any suggestions as to what to do net would be greatly appreciated.

Thanks, Mike

[spinard]

Do you know what trouble codes were stored?
Do you have Vida/DICE to diagnose?
If you think it really is a fuel delivery problem, I would start with the fuel rail pressure. I don't know if your engine has regulated fuel pressure via a fuel pump control module -- if so the rail pressure should typically be ~400kPa at idle (58 PSI).
But I would also be looking at other things like the mass air flow reading, O2 sensors, vacuum leaks, fuel trims, misfire counters (don't know of that model has them), cylinder compression, spark plugs, ignition coils.
It would be good to know whether your dealing with a single-cylinder problem, or a systemic one. But it's probably time to stop firing the parts cannon and get a proper diagnosis.

[Vova585]

Sorry for your problems. Any chance the shop that was working on your car gave you explanation why they replaced the sensor? Was Maf replacement their idea as well or yours? Those parts that you put into your car, where you got them from(if Dorman, ebay, amazon..all junk).
I would suggest to ideally get Vida clone(if you are computer savvy you will be able to install it yourself, I had to ask friend). Or other reliable midrange scanner(icarsoft volvo gen 2 or 3, other members wpuld suggest something that works ok) it will cost you $200-250(so roughly 1.3h of dealer labor time), but might came handy many times. You will be able to erase the codes and start from 0. Then recheck codes and report here what codes you have and we will be able to guide further. If need car asap- dealer is your best bet at this point.

[cn90]

Search forum for PEM issues.
Easy fix...