[Aussieatlarge]

I must surely be running out of things that have required replacing. My rail pressure has been bouncing around and drops to almost zero under load. It is always accompanied by the low pressure side oscillating too. The car would start misfiring too. Tonight the hpfp died. My rail pressure and low pressure side are exactly the same. They track around 80psi. I am amazed how smoothly the engine runs in low power mode!! Btw. I have had no starting problems. Is there any doubt that my hpfp is dead?
Where to source in Australia?

[Brule]

Check your lpfp and hpfp sensors are both plugged in before buying new things.

[Aussieatlarge]

Originally Posted by Brule

Check your lpfp and hpfp sensors are both plugged in before buying new things.

Thanks. I have. I just read that the limp mode opens the fuel control valve all the way open which would account for the low and rail pressure being equal. That said a fully open fuel control valve with no additional pressure from the high pressure fuel pump seems to indicate a dead pump.

[Socket]

Originally Posted by Aussieatlarge

Thanks. I have. I just read that the limp mode opens the fuel control valve all the way open which would account for the low and rail pressure being equal. That said a fully open fuel control valve with no additional pressure from the high pressure fuel pump seems to indicate a dead pump.

Oh no

[insanesam]

Replacing low pressure fuel sensor fixed things for me after replacing the o2's, hpfp and injectors. Have a spare one for sale if you require.

[Aussieatlarge]

Originally Posted by insanesam

Replacing low pressure fuel sensor fixed things for me after replacing the o2's, hpfp and injectors. Have a spare one for sale if you require.

You scare me. I have had O2 sensor error codes for a while. Might try changing both high and low pressure sensors.

[Aussieatlarge]

Originally Posted by Aussieatlarge

You scare me. I have had O2 sensor error codes for a while. Might try changing both high and low pressure sensors.

This was my rail and low pressure. Rail drops to 124 but low is jumping all over the place. I am not sure which is the chicken and which is the egg. Does the erratic low cause the high to drop or is something going on in the high pp that is throwing the low pump around. Note that now in limp mode, the low pressure is as smooth as glass.

[Aussieatlarge]

Originally Posted by Aussieatlarge

This was my rail and low pressure. Rail drops to 124 but low is jumping all over the place. I am not sure which is the chicken and which is the egg. Does the erratic low cause the high to drop or is something going on in the high pp that is throwing the low pump around. Note that now in limp mode, the low pressure is as smooth as glass.

New HPFP, low and high pressure sensors and all good. Also changed all 4 lamda sensors. I drove almost 1000km on just the low pressure pump. I don't think the injectors appreciated that too much. They are leaking. When i shut off the throttle on the freeway the af ratio doesn't go to 234. It sits around 160 although it seems to be improving so they may be cleaning themselves. No money left for new injectors.