four injectors in a Ford 5.0 (such as in a Cougar or F-150) are not getting power, common causes include a blown fuse, a faulty fuel injector relay, or a problem with the large electrical connector (often located on the driver's side fender). Checking these components first is advisable. Additionally, a lack of injector pulse—where the injector wiring has power but no ground signal from the engine control module (ECM)—can be caused by issues with sensor signals such as the Profile Ignition Pickup (PIP) sensor, faulty wiring, or ECM failure.To troubleshoot:Verify the fuse and relay for the fuel injectors are intact.Examine the main injector connector plug for corrosion, loose pins, or damage.Use a noid light to check for injector pulse signal; if there's power but no pulse, the issue is likely with the ECM or input sensors controlling injector timing.Inspect wiring harnesses for breaks or damage.Testing key sensors like the PIP sensor (in distributor) can be crucial because its signal is required for injector pulse.An OBD2 scan for codes such as P020x (injector circuit open) may help pinpoint the specific injector or circuit problem.Addressing these areas will usually resolve the issue of four injectors not receiving power on a Ford 5.0 engine until a specific part failure is identified and replaced���.