how do you test to see if injectors are firing? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 7 Old 12-13-2006, 01:36 PM Thread Starter
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how do you test to see if injectors are firing?

can any one point me in the right direction? i'm not sure if my injector are getting power. is there a link to show you how to do this? thanx fellas...

Thanks alot... ll2none
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post #2 of 7 Old 12-13-2006, 01:49 PM
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I ran into this problem. You can test the injector itself by disconnecting it from the harnes and hook it up to a battery and test if it is working.
Put an aligator clip on the possitive side and connect it to the possitive side of the battery. Then connect a wire to the negative side of the battera and tap the other end of the wire on the negative pin in the injector. If it clicks it is working. if not it is stuck.

For the harness-get a noid light. It detects injector pulse.

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post #3 of 7 Old 12-13-2006, 01:54 PM
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What I have heard some people do is with the engine running at an idle, disconnect the injectors one at a time until you get one that makes no change.

I have also seen a test light on ebay.
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post #4 of 7 Old 12-13-2006, 02:34 PM
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Quote:
Originally Posted by 93blowngreenlx View Post
For the harness-get a noid light. It detects injector pulse.
This is the correct way to check the harness.

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post #5 of 7 Old 12-13-2006, 04:03 PM
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if your injectors weren't getting power the car wouldn't run. does this car start? u can use a stethescope to listen to each injector to hear if its working. you'll hear a clicking sound. there is a 12v power wire in the injector harness that supplies power to all the injectors.
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post #6 of 7 Old 12-13-2006, 04:28 PM
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I checked with a noid light to ensure a signal, then physically pulled the rail up, supported the injectors and held the one i thought wasnt firing by hand and actually watched it spray when the motor was cranked.
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post #7 of 7 Old 12-13-2006, 04:38 PM
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if your car doesn't start u need to check spark, fuel pressure, and if the injectors are getting power. u can use a noid light set to check if each injector is firing. if the car isn't starting then u either have a no spark condition or there is no fuel going to the motor. i cant see all 8 injectors not getting power unless the main 12v source wire for the injectors is broken. all fuses good?
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