Ls swap into a 96-98 obs

Discussion in 'LSX + Carb Swaps' started by 5.3_silverado, Mar 18, 2016.

  1. 5.3_silverado

    5.3_silverado I'm Awesome

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    IMG_20160318_104136873.jpg I am making this thread for my truck and other people that are doing ls swaps in their 96-98 obs. I am doing the swap in my 98 ext cab and wanted to resuse as much of the harness as possible. So I can have the factory looking swap and still keep everything clean. There are some sensors and and components that will require cutting and soldering the wires together. I want to route the harness behind the intake and heads and keep it tucked by the firewall. So bare with me on this and as i start doing the wiring on it Ill keep everyone posted and post pics up as the project goes along.
    This is for lm7 vin T or Z. I am doing the e85 conversion on mine so both will be up here. This is drive by wire.
     
    Last edited: Mar 18, 2016
  2. 5.3_silverado

    5.3_silverado I'm Awesome

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    Numbers 1-80 are the ECM Connector pins. Connector 1, Blue 0411 ECM
    1. C3-18
    2. Splice in 12 Volt wire from the crank shaft sensor.
    3. C2-32
    4. C2-11
    5. Not Used
    6. Not Used
    7. Not Used
    8. Not Used
    9. Not Used
    10. Not Used
    11. Splice in for the Knock Senor #2
    12. C1-31
    13. Not Used
    14. Splice in for Drive By Wire
    15. Splice in for Drive By Wire
    16. Not Used
    17. Not Used
    18. C3-11
    19. C4-18
    20. C3-21
    21. C1-28
    22. Not Used
    23. Not used
    24. C3-18
    25. Not Used
    26. C1-7
    27. C3-18
    28. Not Used
    29. C1-25
    30. Not Used
    31. Not Used
    32. C3-23
    33. C4-10
    34. Splice in from the Park/Neutral Switch
    35. Not Used for Auto Trans. Is used for the Clutch Pedal Switch
    36. C2-8
    37. C2-16
    38. Not Used
    39. Not Used
    40. C3-17
    41. Not Used
    42. Splice in from Relay for Fan
    43. C2-12
    44. C2-31
    45. Splice in if using the A/C
    46. Not Used
    47. Not Used
    48. C3-27
    49. Not Used
    50. Not Used
    51. C2-19
    52. Not Used
    53. C3-16
    54. C3-19
    55. Not Used
    56. For the e85 Conversion
    57. C3-21
    58. C4-11
    59. Not Used
    60. Not Used For Cable Throttle
    61. C1-8
    62. Not Used
    63. Not Used
    64. C3-18
    65. Not Used
    66. C1-21
    67. C3-17
    68. Not Used
    69. C1-19
    70. Not Used
    71. Not Used
    72. C3-22
    73. C1-3
    74. C2-23
    75. C4-18
    76. C2-15
    77. C2-9
    78. Not Used
    79. C1-13
    80. C3-4

    Connector 2, Green 0411 ECM
    1. C3-18
    2. C2-7
    3. Not Used
    4. Not Used
    5. Not Used
    6. C3-6
    7. Not Used
    8. C3-16
    9. C4-1
    10. C3-9
    11. Not Used
    12. Not Used
    13. Not Used
    14. Splice in if using A/C
    15. Not Used
    16. Not Used
    17. Not Used
    18. Not Used
    19. Not Used
    20. C1-29
    21. C1-30
    22. Not Used
    23. Not Used
    24. Not Used
    25. C2-22
    26. Splice in for Bank 2 Sensor 1 H02S
    27. Splice in for Ground
    28. Not Used
    29. Splice in for Bank 1 Sensor 1 H02S
    30. Not Used
    31. C2-28
    32. C2-21
    33. Splice in for the Brake Switch
    34. Not Used
    35. Not Used
    36. Not Used
    37. Not Used
    38. Not Used
    39. Not Used
    40. C3-18
    41. Not Used
    42. C1-10
    43. Splice in for A/C
    44. Not Used
    45. Not Used
    46. C4-5
    47. C2-4
    48. C2-6
    49. Not Used
    50. C4-4
    51. C2-27
    52. Not Used
    53. Not Used
    54. Splice in for e85 Conversion
    55. Not Used
    56. Not Used
    57. C2-22
    58. Not Used
    59. Not Used
    60. Not Used
    61. Splice in for Low Reference Cam Sensor
    62. C3-11
    63. C3-23
    64. Not Used
    65. Not Used
    66. Splice in for Bank 2 Sensor 1 H02S
    67. Splice in for Ground
    68. Not Used
    69. Splice in for Bank 1 Sensor 1 H02S
    70. Not Used
    71. Not Used
    72. Splice in for Bank 1 Sensor 1 H02S
    73. Not Used
    74. Splice in from Bank 2 Sensor 1 H02S
    75. Splice in from Ignition Switch
    76. Not Used
    77. Not Used
    78. Not Used
    79. Not Used
    80. Splice in from A/C
     
    Last edited: Mar 18, 2016
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  3. 5.3_silverado

    5.3_silverado I'm Awesome

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    Hope this helps someone. Ill be doing my swap here in the next couple days.
     
  4. GMRedline

    GMRedline I'm Awesome

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    Very nice. I hope this isn't a dumb question but...

    Are you doing this swap for your 350 or for a LS?
     
  5. 5.3_silverado

    5.3_silverado I'm Awesome

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    For a LS. Currently has a knocking 5.7 in it now.
     
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  6. DRAGGIN95

    DRAGGIN95 Warranty Killer! Staff Member

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    Sounds like every vortec 305 or 350 I have owned, every one of them has gone to crap in short order, I will not own another one, been burned too many times.
     
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  7. 5.3_silverado

    5.3_silverado I'm Awesome

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    That is the second one in under 60,000. Those motors don't like me. My Tahoe has a 5.3. 200,000 still strong.
     
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  8. 5.3_silverado

    5.3_silverado I'm Awesome

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    IMG_20160319_144110744_HDR.jpg
     
  9. 5.3_silverado

    5.3_silverado I'm Awesome

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    IMG_20160319_144110744_HDR.jpg
     
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  10. 5.3_silverado

    5.3_silverado I'm Awesome

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    Resealing the oil pan and rear main seal before dropping it in. IMG_20160319_161602899.jpg
     

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