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Fairly simple:unplug the electrical connecter from injector. You will see 2 metal prongs.With an OHM METER check the resistence between the terminals They should all read 13.8 ohms more or lessIf they are all 14.0 or 13.5 OK whats importantis that they are all the same!They should all be with-in 1 ohm of each other. Example ,if all are 13.5 except 1 which is 16.4 It's bad!GOOD LUCK!

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Q: How do you test injectors on a 1994 4.0 L explorer engine?
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