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THe fuel distributor piston is the ultra precision machined piston that travels up and down via actuation of the sensor plate arm.
It's critical that it moves smoothly up and down its bore to meter fuel to all of the injector lines (fuel distributor).
Drop the piston and damage it and the whole assembly is junk.
I cleaned mine at one time and found my piston worn. It would slide up and down effortlessly only in one orientation with the bore. You could see polished wear marks on the piston, thus a little out of round.
Use Porsche gaskets on reassembly. Especially the foam pad perimeter gasket that the FI distributor and meter rests on. It's a cushion. I made the mistake of silicone sealing it back on. The vibration from the engine made it idle like crap. I reinstalled it with the correct gasket. Perfecto!
I bought all new injectors and tested the spray pattern. Some still streamed at a moderate sensor plate lift.
It's known that the fuel charge to the ports in these cars is not timed.
So, if a spray pattern is less than perfect, does it matter?
Lee 78 SC
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78SC coupe, Silver Metallic
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