Ford f150 4.6
If you have been cranking the engine over and it has been getting fuel to the cyls , and not starting the plugs should be wet. There is some problem with either fuel supply or injector function.
With the key on, there should be power at all injectors.The PCM would deliver the ground at the right time for the injectors to work.. This can be easily verified with a simple test light when the engine is cranking over.
Pick any injector , with the key on there should be power to that injector, Yes/No ?
Then with the test light connected to the battery + , positive terminal, the the test light point connected to other wire to that injector should flash each time that injector is supposed to fire when the engine is cranked over, does it?
With the key on, there should be power at all injectors.The PCM would deliver the ground at the right time for the injectors to work.. This can be easily verified with a simple test light when the engine is cranking over.
Pick any injector , with the key on there should be power to that injector, Yes/No ?
Then with the test light connected to the battery + , positive terminal, the the test light point connected to other wire to that injector should flash each time that injector is supposed to fire when the engine is cranked over, does it?
I took the fuel rail sensor off and primed the pump by turning key on and off and it shot gas out of where the sensor goes and I meant to say they were wet could a bad ground somewhere cause this issue or maybe a bad fuel pump relay and is there any other spot that there is fuses besides the panel under passenger dash
Bear with us on this,
Just because you have fuel at the rail is no guarantee that the injectors are working.
Please consider doing the second part of the test and that is verifying the PCM is sending a ground signal to the injectors when the engine is being cranked over.
The glorified "Fuse panel"is called the Central Junction Box. (CJB) Make sure you check ALL the fuses in the CJB. If I told you to check fuse #34- 20 amp unless you check with the owner's manual you have no idea where that fuse is located, use a test light , easy to do.There are slots on the top of the fuses that you can place the point of the test light on and with the key on , the test light should lite to verify power is on both sides of the fuse. You need not remove any fuses.
We need to know if the injectors are working.
Can you do this?
Just because you have fuel at the rail is no guarantee that the injectors are working.
Please consider doing the second part of the test and that is verifying the PCM is sending a ground signal to the injectors when the engine is being cranked over.
The glorified "Fuse panel"is called the Central Junction Box. (CJB) Make sure you check ALL the fuses in the CJB. If I told you to check fuse #34- 20 amp unless you check with the owner's manual you have no idea where that fuse is located, use a test light , easy to do.There are slots on the top of the fuses that you can place the point of the test light on and with the key on , the test light should lite to verify power is on both sides of the fuse. You need not remove any fuses.
We need to know if the injectors are working.
Can you do this?
Maybe I'm not making something clear.
The second part of the testing is verifying the computer(PCM) is sending a ground signal to the injectors when the engine is being cranked over.
If you connect the test light to the battery positive terminal, then insert the point of the test light into any injector plug terminal that is not the power side, when the engine is cranked over that test light should blink if the computer is sending the ground signal to that injector. Does it ?
The second part of the testing is verifying the computer(PCM) is sending a ground signal to the injectors when the engine is being cranked over.
If you connect the test light to the battery positive terminal, then insert the point of the test light into any injector plug terminal that is not the power side, when the engine is cranked over that test light should blink if the computer is sending the ground signal to that injector. Does it ?


