Check your fuel filter
SOURCE: i have fuel pressure but the engine wont start
Not likely. I believe the injectors have 12 volts going to them all the time. The PCM then grounds them so they operate when the crankshaft or camshaft sensor tell the PCM when the cylinder is on compression stroke.
I would check for an injector fuse first (see owner manual), and then check to see if you have a bad crank or camshaft sensor.
The PCM very rarely fails.
Section 03-14: Engine Controls, Electronic
1994 All Aerostar, Ranger, and Explorer Vehicles Workshop Manual
DESCRIPTION AND OPERATION
Powertrain Control Module (PCM)
The center of the EEC-IV system is a microprocessor called the powertrain control module . It receives data from various sensors:
The powertrain control module contains specific calibrations for optimizing emissions controls, fuel economy, and driveability. Based on information received and programmed into its memory, the processor sends signals to control various actuators:
SOURCE: 2005 Ford Escape Rough Idle - engine code state lean fuel mixture
I recommend getting a repair manual from an auto store for your vehicle. They run $15 to $20. It will tell you exactly how to do everything you asked and also give you the values that should be expected. Hope this helps.
SOURCE: 88 ford f150 inline 6 wont start...
check to see that you have fuel all the way to the engine.to do this: pull the fuel pump fuse and, crank the engine a few times to releive pressure then open the fuel line, cover it with a rag for safety then: replace the fuse and, crank the engine just for a second or, two if no fuel comes out it's another fuel filter probably on the truck frame rail that is the problem or, low pressure from the fuel pump
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