Im currently involved with a 2010 Audi a4 with first generation common rail 2.0t tdi engine with piezo injectors
Car starts and drives perfectly.
Here a link to how a video showing how it idleshttps://youtu.be/LTTMD0nzMdo
If I reset the inlet metering valve adaptation it will idle perfect for a few weeks depending on amount of driving, like sohttps://youtu.be/LCayKYgUzOc
I have been told the fuel filter and inlet metering valve have been replaced and both items do look fresh.
No faults stored but watching measuring value blocks I can see rail pressure fluctuating wildly.
After resetting inlet metering valve adaptation it is perfect and injector correction values are perfect.
A leak off test of the injectors shows no problems.
Supply pressure and flow to the high pressure pump is good.
No TPI or any mention of a software update found on Audi Erwin
Supply to the inlet metering valve and rail pressure control valve are ok and supply and ground of the rail pressure sensor aswel
I attached a capture of it idling before and after IMV reset and the rail pressure can bee seen rising and dropping off repetitively before and its spot on after.
I have no comparison vehicle at the moment but everything looks normal after the reset.
theirs also a captures to see how it responds when the inlet metering valve is disconnected and reconnected.
Anyone come across anything like this before?or anyhting they think that might be worth scoping?
Tomorrow ill have a pressure gauge with me the check the pressure in the injector return line but im leaning towards a problem with supply to the high pressure pump or the pump itself but finding it hard to condem it with the way the car starts and drives