EFI - Electronic Fuel Injection Swap

by Michael Decipha Ponthieux
Posted: 2014-01-27
Last Updated: 2017-03-07

Application

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.
ECUYearVehicleComments
EEC-V1999-2004Mustang / F-150 / Crown Vic / Maurauder / Marquis / Town Car / Continential / Navigator / BlackwoodRecommended for EDIS swaps using Coil on Plugs, Can also be used with 4r100/4R70W trans swaps.
EEC-IV1989-1995Foxbody & SN94-95** MustangCan be used for EDIS swaps as well
SN94-95 EDIS swaps requires sailorbob custom definition file A4A2, can also be used with AODE/4R70W trans swaps EDIS SWAP INFORMATION

Parts Needed

You will need:
ECU w/ Wiring Harness
Lower Intake Manifold Complete w/ Thermostat Housing, ACT (if applicable), etc...
Upper Plenum
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 Injectors
Fuel PumpSee PRE-TUNE INFORMATION for more details
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.

Minimum Sensors/Wiring Required

Description89-93 EEC-IV94-95 EEC-IV96 EEC-V
+ Battery Power Pin # 1Pin # 1Pin # 55
- GroundPin # 20, 40, 60Pin # 20, 40, 60Pin # 24, 25, 51, 76, 77, 103
- Fuel PumpPin # 22Pin # 22Pin # 80
+ Ignition SwitchPin # 37, 57Pin # 37, 57Pin # 71, 97
MAF RETURNALREADY WIRED IN HARNESS
ECTALREADY WIRED IN HARNESS
INJECTORSALREADY WIRED IN HARNESS
IACALREADY WIRED IN HARNESS
ACTALREADY WIRED IN HARNESS
VREFALREADY WIRED IN HARNESS
SPOUTALREADY WIRED IN HARNESS
SIGRETALREADY WIRED IN HARNESS***
TPSALREADY WIRED IN HARNESS
MAF 5vALREADY WIRED IN HARNESS
PIPALREADY WIRED IN HARNESS
--------------Optional-----------------
Hego 1 - Passenger Side FrontHIGHLY RECOMMENDED
Hego 2 - Driver Side FrontHIGHLY RECOMMENDED
-Signal Return***HIGHLY RECOMMENDED TO TAP TO GROUND (DO NOT CUT)
Hego Ground (foxbody ecu only)WIRE TO GROUND
Complete ECU pinout information is available HERE

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. OBD Port Wiring OBD-II Port

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.

Transmission Control

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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