UK Car Repair Questions? Ask a Mechanic for Answers ASAP
Hi and welcome to just answer. What fault codes are you getting?
Do you have the Exact P0xxx code please?
Ok, so for now if we assume the injectors, high pressure pump and the fuel delivery is ok.
Your next step should be a Crank/Cam synchronization check. This can be done using your diagnostic equipment. This will tell you if your cam sensor is working correctly and also that the engine timingis correct.
The cam sensor and local wiring is a common failure on these engines. It is loctated on the rocker cover, with a grey plug
ah ok, the fault codes make this much clearer. When you say you replaced the pressure valve, do you mean the fuel metering valve?
Has the fuel filter been removed, and the cavity checked for swarf content?
Have you tried running the engine with a gravity feed fuel tank directly into the high pressure pump?
If the car runs ok here, then the low pressure side of the HP pump has failed, or you have a restriction in the fuel pipe work leading back to the tank, or the sender unit in the tank
I would suspect that you will find something along the way here. I would also try and inline hand primer to the HP pump.
By doing this you can manually pump fuel into the HP pump while cranking to see if the engine starts and runs.
I would also recommend double/treble checking the fuel filter and housing. Remove clean and reseal before doing anything else.
How did you get on?