Fuel injector operating voltage? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 11-28-2008
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Fuel injector operating voltage?

I'm cleaning my injectors since they are out of the truck. I am going to rig up a push-button power supply to clean the inside and need to know if the injectors run on 12v or do I need to step the voltage down with a resistor. Also, can you get an injector harness from any local parts store?

This is what I plan to do if this doesn't make sense. Thanks.
http://www.rowand.net/Shop/Tech/DIYF...orCleaning.htm
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Old 11-28-2008
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I was at an injector cleaning place and I "think" he said the pcm sent 5 volts to the injectors.
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Old 11-28-2008
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The injectors are pulsed. Applying a steady voltage for a prolonged amount of time is not good for them.
They will stand a 12 volt pulse for a short duration.
When I clean injectors , I hold them upside down and spray carb cleaner into the inlet side.Shake it a few times and spray it again.
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Old 11-28-2008
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I was planning to put a push-button switch in-line so I could manually pulse them. If 5 volts will cycle them, then that's all I'm looking to do safely.
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Old 11-28-2008
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If your electronic savvy you can build a 555 timer circuit that will open and close them like the PCM does.

http://www.kpsec.freeuk.com/555timer.htm#astable
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Old 12-10-2008
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No degree from MIT here. Just looking to do a simple push button. Need to find the operating voltage so I don't fry the injector.
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Old 12-11-2008
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My guess is 5 volts.

Having a hard time finding info to verify.
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Old 12-11-2008
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With the ignition switch on, the injectors have constant battery voltage on one wire and the PCM supplies ground on the other wire of the correct duration (pulse width) for conditions at that instant.
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Old 12-11-2008
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I prbably need to do this are they easy to take out? and where are they?
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Old 12-13-2008
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Rwenzing - With that said, am I good to hook directly to the battery and use a switch to pulse the ground? Thanks.
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