Installing Cobra engine into an Expedition

GIJOE0916

New Member
Aug 15, 2018
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Converse, TX
#1
Has anyone done this? I am a multiple Ford owner looking for advice on how to proceed with this project. I currently have a 2003 Mustang 4.6 in the Expedition. Looking to install another 4.6, but the Cobra version instead. Any advice is welcome.
 
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7991LXnSHO

5 Year Member
Sep 1, 2010
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Kearney, NE
#2
I would start with the wiring diagrams to see how much work it would take to make the ECM and any other in body computers either think it is a big Cobra or if it will be OK with a split personality.
Then I’d want the Cobra motor, complete with computer, sensors and uncut harness for the entire car. Then I would start using the wiring diagrams for both vehicles so I could plan out where to start labeling and swapping in the engine harness and whatever else was needed for the dash and security system.
Are you sure putting in a 5.4 truck motor and getting a tune might be easier? If both motors have similar heads and sensors, it might be a lot quicker and provide a better torque curve to fit the vehicle.
 

GypsyR

Founding Member
Aug 18, 2002
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#3
If I were looking at doing some such I would simply find an '03 or so wrecked DOHC 300 HP Navigator and swap all the parts over. Too easy, since the vehicles are the same chassis.