Fords are designed to illuminate the Check Engine Light when the key is in the Key On, Engine OFF (KOEO), if the light does not come on, it may indicate a problem with a defective Electronic Engine Control (EEC) power relay, a blown fuse, a defective Powertrain Control Module (PCM), harness concerns or a shorted 3 wire sensor.
If the Check Engine Light is on, it indicates the PCM is powered up since the PCM illuminates the Check Engine Light. The PCM will ground the fuel pump relay for 3-5 seconds to allow the fuel rail to get primed up and will shut off the fuel pump if it does not see a cranking RPM. You can usually hear the fuel pump run if the radio and the A/C blower motor
are turned off.
If the PCM receives a signal from the crankshaft sensor or the ignition module, the check engine light should go OFF when cranking. If the light stays on, the PCM is not receiving a crankshaft sensor signal and will not provide injector pulse or spark if the ignition module is incorporated internally in the PCM. Try unplugging the alternator
in case it is causing RF interference.
Try stepping down on the accelerator pedal a bit. When the throttle is cracked open, you are giving the engine air, not gas. If the engine starts with the throttle cracked open, check for a sticking Idle Air Control Valve (IAC).