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the 5th injector that you are refering two is the cold start injector, if you look at the fuel rail there is a bolt with a banjo fitting there, trace the hose up and there is the cold start injector. the positive side of the injector is run through the coolant time switch and only applies power when the engine is below I think 80 degrees C. the ground is fed through the ecm and its only purpose is to feed a shot of fuel if the engine is cold when its cranking. To test the injector simply unbolt it from the intake and place it in a cantainer leaving the fuel line connected then jump the B+ and FP terminals in the test connecter and see if its leaking. The permissible leak rate is no more then 3 drops per minute. There is no need to check everything else if it starts fine but if it doesn't check the time switch(2 wire connecter on the water return neck I believe the connector is black) just check for resistence when its cold and no resistence when its warm, also check the resistence of the cold start injector it should be 2-3ohms
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