I've been testing the fuel injectors in my 2000 F150 4.2l V6 and so far 4 out of 4 injectors read .01 ohms, using 2 different meters. Everything I can find says they should be between 8 and 15 ohms. What would be the effect if they are only .01? Does this mean they aren't opening long enough, or too long, or ???

 

Your either reading the meter wrong, the meters are not accurate or zeroed by shorting the leads to zero the meter before making the test.
What you don't realize is a resistance of .01 ohm is a short circuit and would either blow the supply fuse or burn out the injector drivers in the computer.
If neither has happened that leaves your metering in error.
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If you actually had a resistance of .01 ohm, the current flow would be = to 12 volts divided by .01 ohm to = 1200 amps..
The fuse would not carry the current nor the injector driver or injector stand the current.
With the normal injector resistance range of say 10 ohms, 12 volts divided by 10 ohms = 1.2 amps well within the normal operating range of the system when you consider that only one injector operates at a time.
Good luck.

 

I have the meter on 20k, zeroed out first. Touching the leads to the terminals on the injector, the meter reading rests at .01. The chances of both meters being faulty are pretty slim.

 

 

I just realized I am reading the meter wrong. At 20K, .01 would actually be 10 ohms. My bad. That's why I come to these forums, is to find people smarter than me.

 

Yeah, set it to the 200 ohm scale.

 

Very good.
I hope you were able to follow my electronics example of why you could not be reading .01 ohm.
I knew you had to be using and reading the wrong scale.
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The answer to your question about fuel amounts being injected are two fold.
1. It depends on the pulse width or how long the injector is allowed to be open by computer control.
2. The pressure in the fuel rails.
The flow rate is normally based on 38 psi for their flow rating in pounds of fuel per hour to support a rated horse power max.
For example a 19 lb/hr rating at 38 psi fuel pressure is good to support about 275 hp +\- for 8 cylinders.
That's about 35 hp per cylinder.
Since you have 6 cylinders that's 6 x 35 or about 206 Hp on a V6, +\-.
Injection is always a bit over capacity so the motor never runs out of fuel at wide open throttle unless there is a fuel delivery fault..
Good luck.


Good luck.

 

You can't read that low of a resistance accuarately with a two wire DVM because the lead resistance and the contact resistance are too large and too variable. To read something like that you need a meter with a four Kelvin connection and/or a meter that is made for reading very low resistances such as a meter that used for testing motor windings.

Besides, knowing the coil resistance really doesn't tell you anything other than the coil is probably ok. It won't tell anything about the condition of the other parts of the injector. To test those you'd need a test stand with a high pressure pump and a way to fire the injector and then a way to measure the flow rate and to observe the spray pattern, droplet size and other characteristics.