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      09-22-2019, 03:57 AM   #9
faruque
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Drives: BMW E90, BMW i8
Join Date: Mar 2015
Location: Essex

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@Andystobbs, you may be onto something.

In Inpa, the HP sensor is reading similar values to the LP sensor.
That is WAY too low, its around the 5000, and I guess it should be at least 10x that.

I suspected the HP fuel pump had failed so replaced it.
Replacing the pump made no difference.

Measuring the voltage at the HPFP, is initially jumps to 15V then steadies to about 9V.

If I disconnect all the electrical connections to the injectors so they don't fire at all, when I crank the engine I can see the HP fuel sensor showing increasing pressure.

Questions I have now...
Are the injectors dumping too much high pressure fuel into the cylinders?
Is the Low pressure pump not feeding enough fuel into the system?
Is the DME not driving the High Pressure fuel pump properly?

My next move is to connect the injectors one by one and see if any individual injector is causing the drop in High Pressure fuel.

Any suggestions anyone?
Appreciate 0