Low fuel pressure VOLVO S60R 2004r Manual

[djadek8]

Hello
I noticed on Vida that my fuel pressure is too low
at idle, Mi shows 400 kPa and it's good! .
When I'm in 3rd gear and I give the car up to 6000Rpm, the vida shows a maximum of 475 kPa. where in the upper revolutions of the engine it should be under 500/560 kpa. ; /

I will add that I have replaced it, of course I had used parts from another S60R on hand.
- the fuel pressure sensor
- fuel module
- (New) more efficient Walbro 255 LPH GSS342 fuel pump

then the vida shows 475 kPa and does not want to raise any more.
for this I am posting a video on youtube
maybe some of you had a similar problem?



regards!

[csh]

I don't have Vida/Dice and I have not had any experience with working with the output of the wideband O2 sensors but maybe someone else will chime in that has more specific knowledge. Fortunately the readout in your video provides a good idea as to what is going on besides the fuel pressure and RPM. I can see that for most of the video you are at WOT (wide open throttle) and that the reading from the oxygen sensor is dropping slowly while the throttle is wide open and that oxygen sensor output goes up when the throttle closes. My interpretation of this is that the mixture goes rich(good) when you are at WOT and the A/F ratio increases more rich until the throttle starts to close. Once the the throttle closes the mixture goes lean because fuel is cutoff to reduce emissions until the engine speed is reduced to a point where fuel is needed again.

That was a long way of saying that based upon the readout of the other parameters, I don't think you have a problem. The other possibility is that the system is doing an adequate job of compensating for a lower than expected fuel pressure. I would be more worried if the engine started to run lean at WOT which it isn't if my interpretation of the readout is correct.