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How do you know if the fuel injector is bad - Cars & Trucks

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Check the resistance across the injector terminals with an ohm meter. The resistance should be pretty low, a few ohms, but all manufacturers have their own specifications. Check what the other injectors read for ohms, then compare that with your suspect injector-if way out of range of the others, it is probably bad.
If you put your finger on the injector connector with engine running, you should or might be le to feel it pulse. If you can feel or hear the pulsing, it is probably good, barring any mechanical damage to it. When it pulses, because the computer momentarily grounds that injector's circuit, the injector's pintle on the bottom is raised, allowing fuel under pressure to be sprayed out.

Posted on May 08, 2013


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Have a 2001 ford f250 super duty need to know how to check fuel injectors......truck was running fine and then the enine ran real rough and when you push the gas pedal to the floor there is little...

The fuel injectors have a resistance of between 10 to 18 ohms.Test each injector. If any of the injector readings are higher or lower than they should be, you need to replace them.
For more troubleshooting:---

Put a long screwdriver directly on the injector while the car is running. Hold the handle up to your ear. You should be able to hear a rhythmic clicking sound. If you do, your injector is good. Hearing a clunk-clunk type noise means you have found your problem. Hearing silence or unusual clicking patterns means either the injector, wires or plunger may be bad or sticking. You will either have to clean or replace them.

---------- To know more about fuel injectors and troubleshooting.Please click on the link below:---


Many a times you get black smoke from exhaust due to faulty injectors.Check fuel injectors. Leaking injectors create an overly rich air/fuel mixture and cause black smoke. Take the valve cover off and look at the exhaust part of the injector, when it is running. Each time the injector fires, you should see oil exhausting from it. If you see oil coming out, then the injector is good. When replacing a bad injector, take the glow plug out and crank the engine to get any oil out of the cylinder.----------------- This should help.Thank you.

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There is oil in the number one fuel injecter, what could be causing this?

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How do you know if the fuel injector is bad or the fuel pump is bad? I have a Chevy s-10 2.5 L 4 cyl. Pickup, there is no fuel getting into throttle body, Ican hear the fuel pump working when I turn on the...

Hello there:
To be totally truthfull with you i would first have the fuel filter changed to ensure that the fuel pump can do its job properly than if you want to know if the injectors are working the vehical needs to be running then go to each injector and pull the wire from the injector if the engine starts to shake or make a totaqlly different sound than you know this injector is working HOWEVER if there is no change in the way the engine runs than you have a bad injector or the wiring going to that injector is faulty ok>
I dont think that you pump is bad they rarly will not run at all if they are bad they either work or do not work but you can always take the outlet side hose off and get a large container and to catch the fuel in than have sombody turn the key to the on position and see if you are getting good flow but if it looks weak and barly coming out than yes replace the pump ok?
Hope this is very helpful for you.
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I don't know what year your ford is but most of them have the injectors mounted externally. There not bad at all to do. Vehicle off, release fuel-line pressure, remove the bolts holding down fuel rail, pull the injector/s out of the head, lap injector o-ring with motor oil, install new injector/s into head. lap top o-ring with motor oil, install fuel rail, start vehicle, and check for leaks. If you are only replacing a few injectors do buy new injector o-rings for the other injectors. You will not be able to push the fuel-rail back onto the injectors without replacing them (they will be swolen).

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