correct 94 ecu...

[Tunnermann]

Hi there,

I've been having some problems that look like a lack o fuel. Like stalling/failing.
I'm gonna change my fuel pump also cuz it seems it died (it's not starting since friday). But my mechanic thought it could be something related to the ecu... so I had one at home laying around from when traded some ranger parts with a wrecker.

But now that I'm looking deeper into it it seems that the ecu I have is not for my model (1994, 4.0 v6, mt 4x2)

So I've looked on ebay amd it seems that the one I have is for a 1995 model.

Does anyone know if I can actually use this ecu (is it interchangeable) or I would actually need the correct or an afternarket ecu?

 

[adsm08]

You can't use that one. That's an OBDII computer, indicated by the "EEC-V" near the Ford logo. You need an EEC-IV.

The pinout and pin count are different between the two.

 

[Tunnermann]

You can't use that one. That's an OBDII computer, indicated by the "EEC-V" near the Ford logo. You need an EEC-IV.

The pinout and pin count are different between the two.

Thanks for the reply. Even though it was not the one I wanted ??

 

[adsm08]

Being a 94 you will have to be particularly careful picking a computer. In 94 you could have had sequential or batch injection, and those are different computers.

You will have to look down behind the intake for a cam sensor. Cam sensor mean sequential injection, no cam sensor is batch fire.

 

[RonD]

Pull out and open up your 1994 ECU, Ford calls it a PCM, just FYI

Should look like this inside: http://www.auto-diagnostics.info/ford_eec_iv

You see the 3 Blue Capacitors, little cylinders
These can leak after 20+ years, and will cause odd issues
Under $5 to replace and clean off any damage to the circuit board

Similar cap replacement seen here: http://support.moates.net/capacitor-repair-ford-a9l-ecm/



As for the symptoms, yes, if you can't HEAR the fuel pump run when you turn on the key, a HUMMMMM that you can hear in the cab, then thats the problem, not the PCM
Fuel pump only runs for 2 seconds with key on, but you can turn key on and off as much as needed to either confirm you hear it or you don't