All Things Mk5 > Mk5 General Area
What did you and your MKV do today?
skkane:
Yup. When i tried to loosen it I ended up loosening the fitting on the pump also and didn't notice. I also managed to twist the fuel rail a bit and put a nice kink in it. I managed to tighten it back up and it's dry again but I ordered a new fuel line which is supposed to come on monday. Also got the RS4 FPRV and hopefully it will cure my P301B which is driving me insane, cutting fuel like a MF randomly and I went thru 2 LPFP's, the HPFP sensor, new fuel filter... all to no avail. I found one of your posts randomly on another board (https://www.golfmk6.com/forums/index.php?threads/possible-fix-for-low-fuel-pressure-faults.382402/) and ordered that small rubber line connected to the bottom of the HPFP... will replace it also.
I really don't want to get an upgraded HPFP, already have 2 OEM ones and both do it but I think it's not the pumps but something along the way like those lines maybe. I'm only @ 308hp so I shouldn't really need an upgraded HPFP and the TTRS LPFP IMHO.
Wish it had a boost controller so I could lower the boost by a few notches, it never did it when the timing was off and was only dynoing 261bhp. If I want to do that I'd have to pay for the whole custom software and that's like another 400-750EUR so screw that, I'd rather save up and get the upgraded HPFP then take it to stage 2+ if I'm going that route. Maybe run two maps for low/high boost.
terrier:
Ordered something from https://cobrasport.com/?gclid=Cj0KCQiA6LyfBhC3ARIsAG4gkF_Z_kWURJ4jU84U34YOt-M48ggtX7DnoKEvM_uPJIbyfV0mICmJ0RYaApFeEALw_wcB :happy2:
James Woodward:
I got my car serviced and had the oil changed, nothing special. It's running great as before! Actually I got it only a month ago via https://abetter.bid/locations/usa/ca/san+diego-59 so there is not enough time for anything to get broken :)
ROH ECHT:
--- Quote from: skkane on February 16, 2023, 05:57:18 pm ---Yup...got the RS4 FPRV and hopefully it will cure my P301B which is driving me insane, cutting fuel like a MF randomly and I went thru 2 LPFP's, the HPFP sensor, new fuel filter... all to no avail.
--- End quote ---
Are you certain the fuel filter is the 6.6 bar regulated filter and not the 4 bar?
HPFP sensor? Do you mean the G410 (low fuel pressure sensor) mounted on the side of the HPFP? Or the G247 (high fuel pressure sensor) mounted on the fuel rail...which measures the pressure the HPFP produces?
If you have VCDS, or maybe even with OBD11 (not familiar with), you can actually see if the FPRV is leaking in the video.
You just have it at running temp, shut off the engine and turn the key back to 'On' (engine not running), pull up a MB - Group to show the fuel rail pressure and watch the rail pressure. Its pressure should rise from the heat expanding the fuel.
With VCDS you could also log data for fueling, both high and low sides of the fueling system and see what is happening with both pressures when it acts up. Do you know what it shows for low fuel pressure at idle and the LPFP's load % at idle?
Lastly, a worn tri-lobe on the intake cam can cause fueling to suffer. It only take about 1mm to 1.5mm of wear for it to do so. So, if you run out of ideas...measure the tri-lobe stroke (cam lift) through the HPFP hole in the chain cover (requires turning the crank from a peak to a valley)...or remove the chain cover to measure:
Marticus:
Finished the front lip now just need to fit it.
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