[armend195]

Hello

Looked around the net and could not find a definitive answer.
When reading fuel rail pressure live data on idle the values go up and down sporadically between 27000-30000 kPa (270-300 bar).
Is this normal or should the value be at a stable number?

MAF sensor seems to follow the pattern as it also jumps from 10-25 g/sec.

Car feels as if low boost or lower power on low rpms.

Stage 2 with DPF removed.
I assume that it is not remap related as the car has been working fine after remap, but these issues started recently.
MAP, MAF, IAT sensor cleaned no difference.
No boost leaks, smoke test done.

Thanks

[barf]

Should be stable and shouldn't bounce. Probably bad sensor or quantity control valve on fuel pump, more rarely caused by pressure control valve on the rail.

[armend195]

The n47 has a quantity control valve and a pressure sensor on the rail. Do you know how to troubleshoot this and single out the failing part. The quantity control valve is an expensive item.

edit:

Sorry i was misinformed. There indeed is a pressure regulator and pressure sensor on the rail.
The quantity control valve is on the pump.