I posted a while back and still haven't figured out the problem. I think the fuel rail might be clogged because i have power and good ground, when i removed the throttle body i discovered a connector with two black wires on one side not plugged in. All of my injectors are plugged in and i have good fuel pressure at the test valve before the rail. If anyone could tell me what that connector plugs into that would be great, i could find anything it goes to??? I can take pictures if need be!

 

I assume there is fuel in the rail because there is fuel in the fuel pressure regulator so if anyone knows what the connector with the two black wires goes to i think that might be our fix!

 

How's the truck running? Photos will help identify that connector.

 

It doesn't run.

 

https://scontent-b-atl.xx.fbcdn.net/...12321524_n.jpg


Photo URL i put it on Facebook because i couldnt get it off my phone

 

No idea what the connector is for but for those too lazy to click here is the pic:

 

I want to say that's the idle air control valve connector but I'm not certain.

 

Being its a 87 4.9L engine, that connector is probly the blower motor connector for the injector cooling blower which is most likely not on the engine(not seen in photo). Ford installed that POS system then removed it, but left the wiring in the harness till a later redesign of the wiring.

As it won't run, check for spark and fuel pumps running. Next thing is pull the codes from the ECU, it will hopefully tell what to look for next.

One test I do with a dead engine, is spray starting fluid in the intake and see if it fires off the prime. If it does, then look in the fuel system. If not, then ignition system 1st.

 

No codes on ECM, New Fuel pump and EEC Relays, Good fuel pressure, weak noid lights, new ECM and All Fuses are good!

 

Please define your statement in bold above. No codes as in you got the system pass code of 11 for KOEO and 11 for CM?

 

What i mean is i have no check engine light and the ECM or computer in the truck is brand new, matching numbers as the old one so everything should work correctly. My injectors turn on but they dont squirt gas into the engine when i turn the key, they buzz for about two seconds as well as the fuel pump.

 

My conclusion to this point is i might have a bad FPR or something wrong with my relays. I dont think my FPR is working correctly because my injectors noid and all of my relays seem to be ok. My fuel pump and injectors kick on when i turn the key, but the injector bank seems not to be squirting gas. i recently pulled off my FPR and it had gas in it, but im not sure if it pushed the gas through to the injectors. Any help would be great Thanks for sticking with me!

 

In addition to this statement i would like to add i have no way of testing the FPR because i cannot get the truck to start because it is not receiving fuel just to clear that up.

 

First post you stated,

i have good fuel pressure at the test valve

What was that statement based on, did you use a gauge to check it?

FPR doesn't "push fuel through the injectors" what it does is limit fuel flow back to the tank, the fuel the engine doesn't require based on pressure value.
Low engine vacuum = high engine load = more fuel.

Low vacuum = increase in fuel pressure via the FPR decreasing flow return to tank.

4.9L fuel pressure specs (87 model).

KOEO 35-45psi

engine running vac line to FPR connected, 30-45psi

engine running vac line to FPR disconnected, pressure should increase 5-10psi

If you haven't checked fuel pressure using a gauge you should, judging it by letting little shoot out by pushing the valve steam pin down a second or two doesn't count!

Did you give it a shot of fuel or starting fluid while cranking? if so did it start and run until shot it was given had ran out?

Did you verify when the ignition switch is turned to "run" the red wires to the injectors show bat voltage?

You say you have power and good ground but not clear what that is, I think the fuel rail might be clogged because i have power and good ground,

The connector you found yea its probably for something your truck isn't equipped with, otherwise you'd fairly quick find the other matting half, it'd be right there easy to find.

That said are you sure those wires are both solid black? does one have a light blue strip on it?

 

Yes one has a light blue stripe!
Yes I had towed it to a shop and they told me i had 30psi at the rail relief.
Yes The engine fires up and runs great untill the shot has ran out.
(I always joke about strapping a gas can to the top because thats the only way it runs)

Other info:
My injectors noid dimly last time we checked at the shop.
I'm fairly positive the Relays are correct
I know my injectors aren't squirting fuel