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He could always put 12 v on the leads and listen for a click. They may need cleaned, I've cleaned injectors by soaking them in a plastic bag filled with carb cleaner overnight , then installing them in a fuel rail filled with carb cleaner, pressurizing the inlet and blocking the outlet and then applying 12v to the injectors and pulsing them on and off. Worked really well for some injectors that had been sitting and were gummed up and stuck.
They could also be sent off and cleaned.
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