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mercruiser 4.2L 300hp help

whitejack

New member
my engines normally are great, just started making a knocking sound and loss of power
I tried all the usual things, had all the injector tips replaced anyway, not that, cos I have 2 engines' the same I swapped some parts to try identify the problem, so if I disconnect the fuel solenoid it stops knocking and sounds great, but I get white smoke, so I think iv advanced the timing but at least its not anything inside the engine, so ive changed all the sensors, still same, anyone got idea what it could be
 
test fuel pressure
how would the fuel pressure make it knock and then ok when remove wiring from solenoid
do you think its a injector pump problem, although when I bleed it its very strong pressure
I know by unplugging the solenoid wires it changes the timing and maybe compensating for something else
 
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