E350 CDI quantity control valve?

[WeeRobbie]

Hi there everybody.playing about with an icarsoft scanner to try and pinpoint a lumpy idle (when warmed up)and hesitant acceleration.firstly,the scanner hasn't thrown any codes/no light on dash.but noticed the quantity control valve constantly reads 0 amps.is this normal.secondly,i see 1 injector reading roughly 2 volts more than the rest.thanks for any input as the lumpy idle hesitation is annoying.

 

[BlackC55]

Those injector values are spot on. If they are above 5 they are knackered. A faulty quantity control valve won't cause a misfire. I expect the zero value might be because your diagnosis equipment may not be able to read it.

Have you done a compression check?

 

[Blue30]

For the quantity valve try looking at fuel rail pressure, it should pick up smoothly and quickly when you stab the throttle.

 

[mersum1es]

Both quantity valve and pressure regulator are taking part for rail pressure control. SDS shows controls % value in DAS, Xentry cars are showing current. Sorry I can't se target value in simulation mode so I can't comment what it should be.

BlackC55; those injector voltages shown in pics might be different thing that correction values... IDK why carsoft is 'pushing' that value in diagnose, but SDS do have similar 'injector voltage' measurement; though it states those data values cannot be used fot abalyze injectors (only for documentation).