The box above the radiator is just an integrated relay box, its not the main PCM, it just has a bunch of relays soldered onto one circuit board which makes it difficult because you cant just replace one relay, unless you take it apart and attempt to solder in new ones, but that is complicated. If the vehicle has been sitting for 12 years, I can almost guarantee that the fuel injectors are frozen. Ive seen that on vehicles that have been sitting for only 1 year. I wouldnt recommend shooting any compressed air down the fuel lines, you need to see if theres any fuel pressure getting to the fuel rail. Fords are easy to check for fuel pressure, there is a small port on the fuel rail thats easy to screw a fuel gauge onto, There should be a small plastic cap over the port, just take that off and you'll see the small port that has threads on it. Harbor Freight has a cheap fuel pressure kit that should have the correct adapter, Ford is the small one. When you turn the key On, you should hear the fuel pump prime for about 2 secs. Then check the pressure gauge.
Once you get fuel pressure to the rail, then you'll have to deal with the fuel injectors. But fuel pumps dont really get stuck, they pull a higher amperage than other electric motors, so if you dont hear it at key On, I would check for power at the pump connector with a test light.
the guide below shows how to check for pressure and the one below that shows how to check for fuel injector control, But if they are seized up, they will still show a pulse on a test light, sometimes you can tap on the injectors to free them up, but if that doesnt work, the fuel rail will have to come up to check them, there is a tool you can buy to pulse the injectors and watch for fuel pressure drop on the pressure gauge, thats how we test for injector flow rates when diagnosing a bad injector.
but I have seen on a V8 every single injector frozen up before after sitting 12 months. you may be dealing with multiple issues at once, so you need a fuel pressure gauge.
2nd pic is a Ford fuel rail pressure port. Its usually the smallest adapter in a test kit.
3rd pic is the Fuel injector pulse tool, you just unplug and injector attach the red to the injector power pin and the black to the control wire, hook the clamps to the battery and with fuel pressure up to spec, pulse the injector, it should drop fuel pressure equally to all other injectors. Only do the test once around, then crank the engine over, because youre putting fuel into the cylinders during the test.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
https://www.2carpros.com/articles/how-to-test-a-fuel-injector
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
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Friday, May 24th, 2024 AT 4:31 PM
