yo Dan,
WELCOME!
Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19
http://broncozone.com/topic/14269-code-reader/?&pid=74587&mode=threaded
The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test and greater than 180° F for the Key On Engine Running (KOER) Self-Test.
Run it around to heat the engine up and shift thru all gears incl Reverse. Then turn off all accessories/lights, etc.
Make sure A/C is off and transmission is in Park (automatic) or in Neutral for a Manual & release clutch.
Do Key On Engine Off (KOEO) portion first.
And Post em here according to:
KOEO
&
KOER if you can get it to start & run long enough to get engine to 180° F
----------
If you can electrically test;
EEC & FP
Relay Wiring Diagram in a 90
Source: by Seattle FSB (SeattleFSB) at
http://www.supermotors.net/registry/media/854315
re your;
"...I have also noticed that when it wont start I can hear the fuel pump run constantly and never shut off,.."
Do you remove a batty cable to shut pump off?
With Ignition Key in the "off" position, the fuel pump continues to run; "...appears that the EEC Power relay or fuel pump relay is hanging up..."
and
"after it warms up and you shut the bronco off and go to start it back the pump acts like it should cycles on for a couple of seconds shuts off and she fires right up..."
You hear pump cycle, then shut off, but engine runs?
Test & Diagram at the Diagnostic Link Connector in 84-95; "...Connect FP Relay to any ground to force the fuel pump on when the key is in RUN..." MIESK5 NOTE; from Ford EVTM; The Control Module (PCM) runs the pump{s} for one second when it receives an ignition- on signal. It also runs the pumps as long as it receives a PIP signal from the Hall-effect devices, it continues pump operation even after the key is released from START. If the PIP signals fall below 120RPM, the control module cuts off the signal to the fuel pump relay or the integrated relay control module. The pump will also run when the terminals of the fuel pump test connector are jumped. the Control module signals the pump when it receives a CRANK signal, and when the Control module gets PIP signals that the engine is running. the pump does not run if the PIP indicates the engine is not running even with ignition ON {except for that first one second}.
Source: by Steve at
http://www.supermotors.net/registry/media/245234
Consider Ford Fuel Injection and Electronic Engine Control: How to Understand, Service and Modify, 1988-1993; & Ford Fuel Injection and Electronic Engine Control: How to Understand, Service, and Modify All Ford-Lincoln-Mercury Cars and Light Trucks, 1980 to 1987 by Charles Probst
avail @ BARNES & NOBLE, AMAZON, E BAY, ETC.
