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to tell what injector is bad when engine is running slowly open the injector line to each injector if the engine stutters then the injector is good if it has no difference then it most likely is bad i had a injector that stayed open completely and you could hear a popping noise because it was pushing air back into the system!! good luck!

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Q: How can you tell which injector is bad on a 1986 ford F250 6.9 liter diesel?
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