signum 2.8 turbo

[viper8]

Hi All


signum not starting properly in the morning ,does not tick over good and goes to stall
also getting juddering at high boost
i think it is fuel related ,but dont know where to start

got codes

P0090 fuel pressure regulator control circuit
P0170 fuel trim malfunction

any body got any ideas

[davepoth]

It's telling you that there's a fuel pressure problem. Given that it's at idle too it's unlikely to be a starvation issue (pump, blockage) as if there wasn't enough fuel to idle it would likely not drive at all. So my money is on the fuel pressure regulator or the electronics that control the fuel pressure regulator.