Hello Volvo Land,
Car is a late 2007 V70R TF-80SC. ~121K miles. Been well maintained by original owner and I'm continuing that as best I can.

Two weeks ago my wife said the car stalled at a light (somewhat cold engine) but restarted immediately. She said it's nearly stalled a few times when coming to a stop since.
Yesterday my wife was on the way home from work, she said going up a hill at about 40 it 'bucked' once and nearly stalled at a light.

I hooked the car up to VIDA and got codes:
ECM-280B- Fuel Pressure Sensor- Signal missing
ECM-280C- " " " - Signal too high

I checked a few parameters MAF 13.6 kg/h
Fuel pressure nominal (which I assume is normal value?) 400 kpa
Fuel pressure 402.48 kpa
RPM 715 (that seems awful low)
STFT 1.02
LTFT .14%

I am going to check for vacuum leaks and maybe clean the throttle body and MAF sensor, however, the FPS codes are making me believe I should change the FPS. The car got a new quality OEM fuel filter very recently. I am also concerned about the RPM being so low. Will the fuel pressure try to maintain the 400 kpa under load?

Any thoughts by you guys?

 

Well... since my gut, the internet, and VIDA pointed me in the right direction, I changed the FPS and apparently the issue has been solved.

 

Congrats!
Where was that FPS located?

 

On the transmission (driver's) side of the fuel rail. Under the cover that's underneath the charge pipe.
Take the two screws that hold the charge pipe out, and the two cover nuts, and it's underneath the cover. Easy change.
Just be sure to discharge the fuel pressure with the schrader valve. Part was $50.

 

I had same issue with 05 V70......took it to the shop 3 times for same issue- all total just over $1500....and did not get it fixed. Finally tried a small shop on a recommendation- they kept it 2 weeks! They said last shop put in wrong parts- they replaced fps and a coil- $585........and it has not skipped a beat since.