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Randall C
Randall C, ASE MasterTechnician
Category: Ford
Satisfied Customers: 12803
Experience:  35 years ASE Master Tech, Diagnostic , Electrical Specialist
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no power to #2 fuel injector, what would cause this?

This answer was rated:

no power to #2 fuel injector, what would cause this?

Tracer :

Hello, My name isXXXXX will do my best to assist you.

Tracer :

engine size?

Tracer :

also, how are you testing power at injector

Customer:

2.5L 4cyl checked with ohm meter

Tracer :

just ohm meter? you cant test injector control with a meter you have to use a testlight or noid light. So,, we need a testslight to see if computer is controlling injector and,, we need to unplug that injector, turn key on, probe bot terminals and ONE should have power. have you done any of this

Customer:

I checked the #1 and watched the reading, but #2 has no reading. I can check with test light.

Tracer :

i understand but ohm test is not the way. Set the meter to DC volts, unplug the #2 injector. test the RED wire with key on. Does it have power?

Customer:

Give me about 5 min. will check

Tracer :

k

Customer:

yes I do have power to the plug

Tracer :

ok, the next test is done with testlight connected between the 2 terminals and cranking, light should blink. hard to do without testlight. A meter will not work for this as they dont react fast enough. Going by your symptoms only, if you feel #2 injector not working, you have power so thats not it. So.. this leaves the computer. the computer controls each injector on whats called injector driver. If #2 injector driver failed? the injector will not works. here is diagram of injectors. If you do have a blinking testlight and injector does not work? bad injector. it cant be anything else

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Customer:

I changed injector this morning. If light does not flash check computer?

Tracer :

if no flash? near 99% its bad computer. the other 1% is wire problem from computer to injector

Customer:

test light does flash, so thats not my problem

Tracer :

well,, with new injector, injector control working, then you either have compression or spark problem

Customer:

I have spark, will have to get compression checked. Thanks for the help.

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