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Thread: 1999 formula ls1 pcm to 2001 silverado pcm swap questions

  1. #1
    Potential Tuner
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    1999 formula ls1 pcm to 2001 silverado pcm swap questions

    please delete if not allowed. my question is this. i have a 1999 firebird formula using the stock engine harness. the pcm however got bricked by previous owner. im using a pcm out of a 2001 chevy silverado. i am having problems tuning with the 02 sensors wont read after i bought new 02 sensors for the 1999 firebird. so i decided to buy 02 sensors for a 2001 silverado the only issue is the plug from the 5.3 harness that plugs into the main harness is different. it utilizes a female connector and as well all know you cant plug a female to female connector into eachother. any info you guys have would be of great help.

  2. #2
    Senior Tuner
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    Did you flash the 01 Silv PCM with the 99 Formula calibration?

  3. #3
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    i dont understand exactly what you mean?

  4. #4
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    i guess i thought the pin outs from 2001 silverado pcm and the 1999 firebird formula were different ???

  5. #5
    Senior Tuner mbray01's Avatar
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    Same pinouts, different operating system
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner

  6. #6
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    i got it figured out thanks guys