hi Andrew, So I've checked the readings on my healthy FSI and its a different story. The pressure readings are near enough the same in both fields. So i guess one value is expected fuel pressure and the other is actual fuel pressure?, meaning the fuel pressure is way too low on the poorly fsi. attached is a screenshot of the healthy fsi fuel pressure readings.Hi,
Thanks for posting your readings. I'm not sure what that third pressure value is, I will need to look into that. I don't think there is a sensor on the low pressure side so the ECU won't know what that is. I will check the values on my FSI and compare with yours. I'll probably be able to do that in the next couple of days (rain permitting!).
Interesting regarding knock sensor fault. I think the knock sensor and pressure regulator and sensor wiring goes in the same loom on the back of the engine. Could anything have been damaged there?
regards
Andrew
hi Andrew, So I've checked the readings on my healthy FSI and its a different story. The pressure readings are near enough the same in both fields. So i guess one value is expected fuel pressure and the other is actual fuel pressure?, meaning the fuel pressure is way too low on the poorly fsi. attached is a screenshot of the healthy fsi fuel pressure readings.
i also note that the 'load' field shows a value all the time on the healthy FSI, but only very occasionally on the poorly FSI, usually it just shows 0%
cheers
Hi nod it would be the high pressure fuel pump what fixed the issue as that was what fixed my FSI when it was running roughto finish this thread, i've finally fixed the FSI. I checked out the wiring loom more thoroughly after removing the upper and lower manifolds and found no obvious faults. I changed the air conditioning pressure sensor, I replaced the high pressure fuel pump and the Audi A2 00-05 Shut Off Valve 1.6 FSI - Part 036906519B, and the lower intake manifold along with the fuel pressure sensors on the manifold. After all that, thankfully it is running really well, with no fault codes. It was a mission to sort it, and I still don't know for sure which part fixed the fuel pressure problem. hope that helps someone. cheers nod