4.6L engine swap problems

[Towncar]

Originally Posted by junk yard doggie

...Steve should know a good link to find those...

Can't find a wire diagram anywhere for the 1992. My 92 iso is corrupted or something, I can't mount it. There's always that pay $13 service I posted in the non-specific section

PS: Dereck at LOL knows all this electrical stuff very well.

[Decipha]

can some one verify wheather or not the fuel pump is controlled by the ecu? I know on my chevy beretta with the computer disconnected the fuel pump will not come on...

fuel is not the problem, my problem lies in the ecu... i can not get the service engine light to come on during initial start up... i need the service engine light... i checked the connection at the ecu harness and all is well.. i also bussed out the dmm and checked to see if the harness was getting power and it was... im kind of thinking that the ecu may be shot.. im going to try to locate a replacement at my aunts salvage yard and see if that works... hopefully i can get this dam car going

[Towncar]

Originally Posted by Decipha

...my aunts salvage yard...

Wow, we all need one of those Aunts

[Decipha]

lol yeah she comes in handy i get any part i need free

[hflyboy]

Can you verify that the ecm has a valid ground? The ground is as important as the power circuit, and the ecm controls the fuel pump by grounding the fuel pump relay. Sometimes it's easy to overlook putting all the ground wires back after an "enginectomy".

[Decipha]

Originally Posted by hflyboy

Can you verify that the ecm has a valid ground? The ground is as important as the power circuit, and the ecm controls the fuel pump by grounding the fuel pump relay. Sometimes it's easy to overlook putting all the ground wires back after an "enginectomy".

you are good.... thats EXACTLY what i was thinking... you wouldn't happen to know where it is grounded would you?

[junk yard doggie]

There are some grounds that I know of located behind the kick panels on either side. I believe there is a green screw used to fasten them. There is also one under the hood. It goes from the passenger side cylinder head to the fire wall. The tab on the firewall is right on top and easy see.

Mike

[hflyboy]

I have a 1999 Navigator, and with the caveat that the PCM pin assignments may be different, I can provide the following information from my service literature. Please understand that I don't know these assignments to be the same on the TC!

PCM pins 3, 51, 77, 103 are all power grounds.

PCM pins 71 and 97 are both vehicle power (batt. voltage)

PCM pin 55 is Keep alive power

PCM pin 25 is the PCM case ground

PCM pin 80 is the fuel pump relay control.

Good luck...

[Decipha]

yeah i don't think its the same.. on the town car they only have 60 pins

[hflyboy]

oops...not much help there. Sorry!
On some earlier 60 pin ECMs the following pin assignments apply:

Pin 1 = keep alive power
Pin 17 = check engine light
Pin 20 = case ground
Pin 22 = Fuel pump relay control
Pin 37 = vehicle (battery) power
Pin 40 = Power Ground
Pin 60 = Powe Ground

I've lost my 4.6 liter TC book....the data above is applicable to the EEC-IV ECMs.

[Decipha]

fixed the computer prob now have another problem

http://www.automotiveforums.com/vbul...d.php?t=613468

[rhandwor]

Go to the relay center you have two relays an eec relay which powers the computer and the fuel pump relay which powers the fuel pump. You probably left a ground loose. Their should be a ground by the computer . Did you hook up the grounds for the engine and computer system. I would go over your work as I'm almost certain you didn't connect a ground somewhere. They used to have the eec relay and computer ground in right kick panel. Fuel pump ground center of trunk. Fuel pump relay in trunk by hinge. Then they went to a relay center in the engine compartment.