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Ealwhat powers the injecters and how they work how you check them

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Without knowing the model car your working on I'll assume it's a standard Ford car fuel injection system. The injectors each have two wires going to them. All of the injectors are powered through a common wire. What make them work is the processor (computer). When the processor determines that it's time to open an injector, it grounds the wire coming from the injector. The processor uses a duty cycle to allow the injector to be on for a certain amount of time.

The processor determines when the injector should be turned on by using signal inputs from sensors. Oxygen sensors in the exhaust tell the processor if the air/fuel mixture is correct or whether it needs to add fuel or take away fuel. The fuel is pressurized by the fuel pump and typically measures 40-65 psi, depending on the vehicle. This high pressure fuel goes through the injestor and is atomized when it goes through the 3-4 small holes in the injector. The atomized fuel mixes with air and enters the combustion chamber to be compressed and burned to make power.

Posted on Apr 07, 2011

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Motor has no power


the 1996 has 4 injectors, its MPI , EFI injected.
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but no EFI system works right with #1,2,3 bad.

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1 Answer

No power to number 1 injecter 2002 dodge ram 1500 3.7


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1 Answer

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I would check the wires that make the injector function to see how much power is going to them (using a multimeter). Now check the wires on the injector that is not working and see if you have power there. If you do then you have a bad injector. I don't think you do since you said that you switch wires and you are getting fuel at that injector. Check your wiring harness for shorted out wires. It doesn't make sense for one side to be working and the other not to be. I don't think it is a problem with your ECU, but it may be. See what colors the wires are going to your injectors and trace them back to the ECU, a wiring diagram would help. You need to check to see if you are getting power from the control module to the harness. I believe, however, you are experience a shorted out wire somewhere in the harness. That is where I would start. If you confirm you are getting power to the control module, but you are losing it somewhere in the harness it may be easier to just run a new set of wires instead of tearing apart the harness.

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1 Answer

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I had same Problem with 03 Megane about 6 weeks ago
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just happened again with same message Check Injection.
RAC told me injection has gone, so now yet again back in the garage.. How i wish i never brought a Megane

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1 Answer

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