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Thread: 2012 Mustang GT500 5.4 swap to 5.0

  1. #1
    Potential Tuner
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    Jul 2023
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    2012 Mustang GT500 5.4 swap to 5.0

    Few questions here, have a buddy who has a 2012 5.4 and blew it up took to a garage and they talked him into putting in a 5.0. My question is the pcm for the car is not with it no longer so I purchased the correct one to the vin but its for a 5.4 and not the 5.0. Tried to start it up and no start just dumps fuel. I changed the software with IDS to a 5.0 and now it starts but have issues with no throttle and idles high then dies.What do i need to change in hp or can some one guide me in the correct direction. Newbie here

  2. #2
    Senior Tuner veeefour's Avatar
    Join Date
    Oct 2016
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    Poland
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    1,856
    You need a custom tune - you have to be more specific on parts used as this is probably a mix of two parts bin

  3. #3
    Tuner Lost0187's Avatar
    Join Date
    Oct 2021
    Location
    Canton Ga
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    196
    Ya for sure you need more info for your calibration did you write the stock vin from the gt500 with ids or the 5.0 vin and calibration? If you used the gt500 vin the calibration will be set up for a 5.4 not a 5.0 no matter what Copperhead PCM you bought. Let us know what all was done and be specific. What fuel system is being used we need all the details to try and help you also post the ids read from you MPVI.
    King Ranch Expedition 5.4 3v 6R80 Coyote PCM , M112 Blower, Kooks Long Tube Headers, Green Cats, Aeromotive Regulated Return Fuel System, ID 1000 Injectors, Custom Interior Wiring, Track Apps, EPS mode adjustable, +6 Blower Pulley w/ Innovators West SFI Balancer, Afco Dual Fan ZL1 Heat Exchanger, Flex Fuel E85 0-60 5 secs 12.0 best quarter mile time.