EFI - Electronic Fuel Injection Swap
by Michael Decipha Ponthieux
Last Updated: 2017-03-07
This applies to all pushrod and modular ford engines or any other engine that is capable of operating with a ford ignition system.
Note: EDIS setups SHOULD have a cam sensor installed for proper engine operation for every startup.
Which ECU ?
If your looking for quick, easy, and simple, your fastest route is to snatch the complete fuel injection setup off an 89-95 mustang v8 along with the distributor.
If you have the means to swap in EDIS at the same time, I HIGHLY recommend doing so, this will allow you to use an OBD-II EEC-V ecu.
I highly recommend using an OBD-II ecu for all EDIS swaps. The 96+ EEC-V's do not require an external EDIS Module as the 95 and older EEC-IV's require.
SN94-95 EDIS swaps requires sailorbob custom definition file A4A2, can also be used with AODE/4R70W trans swaps
EDIS SWAP INFORMATION
|EEC-V||1999-2004||Mustang / F-150 / Crown Vic / Maurauder / Marquis / Town Car / Continential / Navigator / Blackwood||Recommended for EDIS swaps using Coil on Plugs, Can also be used with 4r100/4R70W trans swaps.
|EEC-IV||1989-1995||Foxbody & SN94-95** Mustang||Can be used for EDIS swaps as well
You will need:
It will be necessary to run new fuel lines (feed & return) to the fuel tank in some applications. In these applications, I recommend mounting the fuel pressure
regulator near the fuel tank so you only have to run one line from the regulator up to the rails.
|ECU|| w/ Wiring Harness
|Lower Intake Manifold Complete|| w/ Thermostat Housing, ACT (if applicable), etc...
|Throttle Body|| w/ TPS and IAC valve
|MAF Sensor|| w/ housing, the sensor itself used in a different housing will have NEW flow characteristics
|Fuel Rail|| w/ Fuel Pressure Regulator
|Fuel Pump||See PRE-TUNE INFORMATION for more details
Minimum Sensors/Wiring Required
Complete ECU pinout information is available HERE
|Description||89-93 EEC-IV||94-95 EEC-IV||96 EEC-V||
|+ Battery Power|| Pin # 1||Pin # 1||Pin # 55
|- Ground||Pin # 20, 40, 60||Pin # 20, 40, 60||Pin # 24, 25, 51, 76, 77, 103
|- Fuel Pump||Pin # 22||Pin # 22||Pin # 80
|+ Ignition Switch||Pin # 37, 57||Pin # 37, 57||Pin # 71, 97
|MAF RETURN||ALREADY WIRED IN HARNESS
|ECT||ALREADY WIRED IN HARNESS
|INJECTORS||ALREADY WIRED IN HARNESS
|IAC||ALREADY WIRED IN HARNESS
|ACT||ALREADY WIRED IN HARNESS
|VREF||ALREADY WIRED IN HARNESS
|SPOUT||ALREADY WIRED IN HARNESS
|SIGRET||ALREADY WIRED IN HARNESS***
|TPS||ALREADY WIRED IN HARNESS
|MAF 5v||ALREADY WIRED IN HARNESS
|PIP||ALREADY WIRED IN HARNESS
|Hego 1 - Passenger Side Front||HIGHLY RECOMMENDED
|Hego 2 - Driver Side Front||HIGHLY RECOMMENDED
|-Signal Return||***HIGHLY RECOMMENDED TO TAP TO GROUND (DO NOT CUT)
|Hego Ground (foxbody ecu only)||WIRE TO GROUND
OBD-II Port Wiring
Although the OBD-II port isn't required, it is nice to have and is very simple to wire up. The following wiring diagram is also to be used for
wiring bench flashing stations as well.
Startup / Tuning - Base Tunes
Base tunes can be downloaded from the HOMEPAGE and include detailed step-by-step
how-to's for initial fire up. Write-ups are also accessible from the homepage for details and specifics for dialing in your tune and fine tuning there after.
The 94+ ecu's can control AODE/4R70W transmission as well if you so choose to swap one of those transmission in as well.
The 89-93 mustang ecu cannot control an ELECTRONICALLY COMPUTER CONTROLLED TRANSMISSION.
Mechanical automatic transmissions such as an AOD is basically the same computer wise as a manual transmission as well
as any other automatic transmission that does not get shifted by the ecu and requires no ecu control for operation.
Keep in mind, the 94-95 mustang ecu requires a 1 ohm tcc and the 96+ requires a 10ohm tcc. Reference
the 4R70W SWAP INFORMATION for specifics.
Also see the TRANS TUNING WRITE UP for more details.
Can my tune cause a no start?
No, the EEC-4 and early EEC-5 ecu's do not control the starter relay "solenoid", however some later 2003+ eec-5s do have provisions
for starter relay control used on select luxury sedans such as the 03/04 Marauder and the like.
Can I use a 6 cylinder ECU to run my v8?
No, the v6 ecu's only have 6 injector outputs, you can use an 8 cylinder ecu in a
6 cylinder or 4 cylinder engine though, but you cannot use a 4cyl or 6cyl ecu in an 8cyl.
If you have any questions along the way don't hesitate to post on the support forum
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