This is topic 2.3 to 5.0 swap questions in forum Tech Talk at Northern California Ford Owners  .


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Posted by street_illegal_stang (Member # 1554) on :
 
Hi,
I'm helping out a friend on a budget do a 5.0efi swap to his 88lx coupe.
We're wondering if the stock 2.3 fuel pump will work okay;are they the same 88lph pump?

Will the alternator wiring need to be swaped from a 5.0 car?

Fuel relay the same?

is the ecu relay the same? the relay next to the cpu located at the passenger kick panel.

Is the coil is the same?

Thank for the help [patriot]
 
Posted by phat50 (Member # 1998) on :
 
quote:
Originally posted by street_illegal_stang:
Hi,
I'm helping out a friend on a budget do a 5.0efi swap to his 88lx coupe.
We're wondering if the stock 2.3 fuel pump will work okay;are they the same 88lph pump?

Will the alternator wiring need to be swaped from a 5.0 car?

Fuel relay the same?

is the ecu relay the same? the relay next to the cpu located at the passenger kick panel.

Is the coil is the same?

Thank for the help [patriot]
Not sure if its the same 88lph pump but i drove for a while with a stock 2.3 pump.

With the alt wire, i just made mines reach, never had a problem.

Fuel Relay should be the same, never changed mine. ecu relay, i just used the one that came with the 5.0 harness.

Not sure about the coil, should be the same, i used a msd one tho.
 
Posted by street_illegal_stang (Member # 1554) on :
 
Thank bro,
thanks some good info
 
Posted by Blind (Member # 3052) on :
 
fuel relay depends on the year, the one on my `89 was a dummy box and I had to swap the one from my donor car over, it's located under the drivers seat on my car, it moved to the engine bay and ECU harness on 92+ cars

coil is the same

alternator/headlight harness is easier to swap if you have a donor one IMO, really easy.

the pump might be the same but the fuel lines are totally different, I just swapped the gas tank and lines from my donor car over and didn't worry about it.
 
Posted by 91fox (Member # 7842) on :
 
just try and match the harness from your friends car with what ever doner car because of variations in the electrical from 87-93 and if you can swap out the differential/brakes with V8 stuff.
 
Posted by street_illegal_stang (Member # 1554) on :
 
quote:
Originally posted by Blind:
fuel relay depends on the year, the one on my `89 was a dummy box and I had to swap the one from my donor car over, it's located under the drivers seat on my car, it moved to the engine bay and ECU harness on 92+ cars

coil is the same

alternator/headlight harness is easier to swap if you have a donor one IMO, really easy.

the pump might be the same but the fuel lines are totally different, I just swapped the gas tank and lines from my donor car over and didn't worry about it.
I don't have a donor car,
But we do have most of the things to get it going.
The car is a 1988 lx mustang 2.3 coupe
I think the fuel relay is under the driver seat and green/black. is that the same as 5.0?

We plan to reuse the 2.3 fuel tank assembly.

we also plan on replacing all the fuel lines with 5.0 fuel lines.

I'm gonna try the 2.3 harness for the alternator for now... I do have a harness from a wrecked 89 gt, but we noticed it was cut in half when freeing up the hood from the smashed core support. I guess I can patch it up.
Blind,
Thanks for telling me about the coil.

[ July 12, 2009, 02:31 AM: Message edited by: street_illegal_stang ]
 
Posted by street_illegal_stang (Member # 1554) on :
 
quote:
Originally posted by 91fox:
just try and match the harness from your friends car with what ever doner car because of variations in the electrical from 87-93 and if you can swap out the differential/brakes with V8 stuff.
We swaped in a 8.8" with 3:73's and moser axles
with all the rear brake lines changed out to v8 spec. for a start.

We dont have a donor car, but lucky enough after all 8 or so years, we managed to have most of the parts laying around taking up space.

We picked up this 88LX coupe for $350 at a local police auction.
Thank you all for the support
 
Posted by Blind (Member # 3052) on :
 
the fuel pump relay under the seat on my `89 was an empty box, I had to use one from a v8 to get the fuel pump to kick on, I think the 4cyl ECU harness had the actual fuel pump that was used on my car, similar to the later 92+ v8 harness style
 
Posted by 514 Mullet (Member # 7402) on :
 
Alternator wiring is in the headlight harness from a V8 car. It can also simply be extended.
Relay will be the same and located in the engine bay. Not sure what you are asking about with the computer relay. Its on the engine harness itself from a V8 car by my memory. Anything else down there is plug and play. Coil is the same. Fuel pump is the same for 4 or 8 cylinder cars.
 




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