I have a customer with a 2004, Vectra Z19DTH.
It's slow to start after standing for more than an Hour, and has recently started cutting out under load.
Fuel pressure fault sprung to mind!
Fault codes are to do with Fuel Pressure Regulation, upper limit Reached, which will be the cutting out under strain.
I'm not up to scratch on this type of fuel Regulation, as it has what seems to be a DRV on the
back of the pump, as in most common rail engines, Then it also has one on the fuel rail, opposite end to the pressure sensor.
Upon cranking, it takes a while for the pressure to Hit the 200 bar mark.
On tickover I scoped both " Rail Regulator" and " Pump Regulator"
I'm sure the rail Regulator is ok, but unsure of the the " Pump Regulator", but am not sure, as I'm not sure exactly how this system works!
Here are the scope captures at Idle,
Any help or explanation into this system would be Appreciated...