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Fuel injectors one of my fuel injectors is not working. i know that the fuel injector is good, so what else could it be

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There is a module to control the injector valve o and off. If it doesn't give a signal to turn on the injectors then injector is not working. The electrical connector from your injector is where the signal from the module going in.

Posted on Sep 10, 2009


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1 Answer

How will the change of fuel injectors help with engine performance and what engine parts are affected

Andre, changing fuel injectors that are not faulty,damaged,leaking,etc. may not improve any performance. have checked and diagnosed by a good technician.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Aug 11, 2016 | Cars & Trucks

1 Answer

I have four fuel injectors and only 2 will spray fuel into motor. What could be the problem for the others not spraying?

Couple possibilities:
  1. the injectors are clogged
  2. The valves/pumps for the injectors are not working.
If it's (1) then you can try running a bottle of OTC fuel injector cleaner through. Mechanics will often have access to way more potent stuff in the case of a lot of bad deposits gunking them up.
If the other injectors are squirting just fine, it'll be odd to have the other two not working - they should have clogged/scaled up about the same. In that case, if could be the valve.actuators for the injectors. Location will depend on your vehicle. They will have input connections to the fuel management system that is triggering them many times per second. Check that the wiring connections are secure to them on both ends. If so, and if they'll reach, you can try swapping the leads with one of the functioning injectors and see if it works now. Swap it first by connecting the injector end of a working port to the non-functioning injector. If it works now, take the same lead and connect it to the base of the normal cable for that piston. If it works when wired from another cable source, and another cable, then you know the injector works. If the cable that normally goes to the injector, hooked to the source for a good injector works, then you know you have a good cable. If both of the above work, then run the known good cable to a known good injector, from the original source. If it doesn't work, then the source trigger unit for the injector is likely bad. That'd be a whole other discussion.

Generally, the injectors themselves are all the same, so you can go about the testing by just swapping a working injector with one of the 'not working' ones. That'll tell you pretty quick if it's an issue of no gas flow, or no control working, and go from there on cleaning out gas lines or replacing control parts.

Good Luck!

Nov 07, 2015 | Cars & Trucks

1 Answer

04 400ex has lots of spark cpmpression and fuel timing is correct i dont no wat else to do

Did you check fuel pressure with a gauge? Autozone, some others, rent or loan fuel pressure gauges. If fuel pressure is good, check injector circuit. Each injector has two wires-power and ground. With key on- engine off, each injector should have battery voltage on the power wire (each power wire would be same color to all injectors)-use a test light or voltmeter to check for power.

If injectors have power to them with key on, post back and I can tell you how to check injector ground circuit with a test light. .... well here, you clip the test light lead on the POSITIVE battery post, and stick tester probe into the ground side terminal of injector connector. Now have someone crank the engine over: if ground circuit is good, the test light should be blinking. If both tests work, power and ground circuit, then injector circuit is good and they should be pulsing to spray fuel into the cylinders. Let me know what you find.

Jun 08, 2014 | Cars & Trucks

1 Answer

Not getting fuel to motor

You can check the injector circuit with a test light. Have you verified no fuel is coming out of bottom of injectors, when the engine is cranking over? Use a flashlight, looking down the throttle body.

Ground a test light lead to a good ground. Pull injector connectors off, and turn key to on The white wire with red stripe is the power wire to both injectors, it is hot anytime key is on. The wire splices off to both injectors. If power is good, check the ground side of circuit: place the test light clip on the POSITIVE post of battery, and put probe into the ground terminal of the injector connector-the black wire. Now have someone cranking the engine over-the test light should be blinking. Every time it blinks, the computer is repeatedly grounding the injector circuit (internally) and this causes the injector "pulse"- turning the injector on for fuel to spray out. If both tests are good (power with key on, and blinking ground with engine cranking) the injector circuit is working as it should. If no power, check computer for power in-check the main relay, for one.
As for the injectors themselves, not likely both would go out at same time, but only way to test them on the vehicle is to put an ohm meter across the terminals and check resistance. Both should be similar, with low ohms showing, somewhere on the order of 2- 10 ohms, I don't know the specs for Nissan-check with the dealer.
Good luck, let me know what you find out.
To verify the injectors or the injector circuit is the problem, try a little starting fluid down the throttle body, or even carburetor cleaner. If the engine fires and runs a few seconds, then you know injectors or circuit is the problem.

Apr 01, 2014 | 1987 Nissan Pickup

1 Answer

My 94 ford explorer 4.0 cranks but wont start. i have 38lbs of fuel at rail port and spark at wire. it also runs on etherfor a hot second. what else can i try?

Check your injector circuit. It will also let you know if the PCM is allowing the injectors to energize. Here's how:
Pull off one injector connector. Turn key to on. Use a test light and clip the black lead of tester to ground, Use the tester's probe to probe both wires in the injector connector. One of the wires should have power and light the testlight, meaning the injector power circuit is working. Now for the injector ground circuit.
Move the black lead of testlight to the battery positive post. Now probe the wire in the connector that did not light up. Have someone crank the car over. When cranking the test light SHOULD be blinking, meaning the PCM is properly grounding the injectors to work. If both wires passed the test, your injector circuit is good.
If it's not working,either the power circuit from ignition switch to injectors is out (no steady light), or the ground circuit from injectors to PCM is not working (no blinking light).
Good luck, post back with results for further assistance.

Nov 29, 2011 | 1994 Ford Explorer Limited

1 Answer

Cpi unit is not working right what should i do

purchase a "noid" fuel injector tester from an auto parts store; it is a small light attached to a fuel injector plug unplug an injector from the wiring harness and plug in the "noid" to the injector harness connector you just removed; start the engine: if the "noid" flashes when you crank the engine you will know that that fuel injector has power to it, then: use the "noid" to check each injector in turn. if the injectors are good test the fuel pressure with a fuel pressure gauge; low pressure suspect a bad fuel filter.

Jul 27, 2010 | 1994 GMC Jimmy

1 Answer

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.
Best regards mike

May 30, 2010 | 1987 Chevrolet S-10 Pickup

1 Answer

My injector dont work and i need to know why


Mar 21, 2010 | 1989 Chevrolet G10

1 Answer

1993 Maxima, low idle skip, on 4th cylinder, code on computer comes back fuel injector signal circuit fault, code 51. Does anyone know what can fix it? Also, injector checks out good, plug works good,...

Well the answer is right there. Its not the injector itself. Its the circuit leading into the injector that is not working. What that means is the computer cant tell the injector when to spray the right amount of fuel because the signal is not getting to the injector due to the circuit not working. Have a mechanic check that with a probe to verify

Jun 19, 2009 | 1993 Nissan Maxima

1 Answer

Ford-F350 7.3 turbo sluggish when you accelerate

i dont know about the turbo going bad,but i do know that ive seen 7.3 diesel have bad injectors,usually 2 at a time, check for fuel at the injector which can get messy so wear protective gear such as goggles and gloves,while running crack open the fuel line at the injector to see if there is fuel,it should run rough which is good on the working cylinders,if it doesnt change then maybe a bad injector,or not enough fuel pressure at that injector.injection pump issues are another thing,but most likely its an injector.

May 09, 2009 | 2001 Ford F350 Super Duty SuperCab

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