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I used a mechnics stethoscope and listened to them. You can do the same thing with a screwdriver. Put the tip on the body of the injector and put the handle in your ear. On a good injector you will hear it ticking, while a bad one usually makes no noise, or less noise compared to know good ones. You can pull the whole rail out and crank the engine over to check spray patterns. Just pull the coil wire off the distributor and ground it to metal.
regards
Mech
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