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Thread: Conversion Progress Report

  1. #1
    Join Date
    Aug 2011
    Location
    Ellsworth Air Force Base, SD
    Posts
    143

    Conversion Progress Report

    Seeing some good progress on this conversion by staying very busy on this 3 day weekend. I started the weekend by deciding to tackle the conversion of the wiring harness. After a phone call to Chevy-Art, he convinced me that the wire complication was pretty much in my head and it's really a lot easier than one would think. I followed the guide on LT1swap.com, using the 04' harness guide. Mine is an 05' Tahoe harness and I found no differences between the two. Very easy task, but requires some attention to detail. I followed Art's advice and laid the harness out on a flat open surface and removed all the tape. Everywhere the harness splits or turns, I put a ziptie there to help maintain the factory shape of the harness. After ziptied, start pulling pins from the PCM following the guide.





    These are all the wires and plugs that ended up being removed. I think that I will hold on to these until the motor is in place and wired. This is in case I need to lengthen anything.



    Question: I cannot figure out what these 2 plugs are. The wiring removal guide ended up having me remove 3 out of the 4 wires that run to this plug. The only wire left to both plugs are a pink power wire. Does anyone know what these are?





    Engine Compartment: My engine bay was in really bad shape as far as filth goes. the frame had no more paint on it and everything was covered in 19 years of dirt, oil, and grease. Since I am putting all this effort into giving my truck a new start in life, might as well throw in the kitchen sink too.

    Here is nasty bay before:



    And here is what it looks like after 10 hours of scrubbing with a tiny wire brush, some brillo pads, and a bucket of Dawn and Thinner and then painting.



    Thanks for looking so far.
    1994 Chevy C1500 RCSB 05' DBW 5.3 Conversion Complete
    My build

    Coming soon ....... Full Repaint, 214/220 Cam, Yukon Posi with 3.73's, remove body lift

  2. #2
    Join Date
    Dec 2004
    Location
    San Antonio, TX Area
    Posts
    1,757
    Awesome progress so far. That engine bay looks new. On what connector do the pink wires end up at?
    "ALisSa1 Silverado"
    1990 Chevrolet RCSB 2002 Chevrolet Camaro LS1/4L60E
    Scrimpin Ain't Easy
    ( . Y . )


  3. #3
    Join Date
    Aug 2011
    Location
    Ellsworth Air Force Base, SD
    Posts
    143
    There are two connectors that are the same. Each side of the harness has one. The back end of the plug has been cut because it was wired into something else on the donor vehicle. Here are some better pics of this plug and the cut plug to the vehicle.





    This the vehicle side of the plug that was cut and just left hanging on the harness.

    1994 Chevy C1500 RCSB 05' DBW 5.3 Conversion Complete
    My build

    Coming soon ....... Full Repaint, 214/220 Cam, Yukon Posi with 3.73's, remove body lift

  4. #4
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,117
    those look like o2 sensor connectors; if they are the front sensors, you'll need all the wiring; if they are the rear o2 connectors then remove the wiring and connectors completely.

  5. #5
    Join Date
    Aug 2011
    Location
    Ellsworth Air Force Base, SD
    Posts
    143
    You are absolutely right. They must be the rear one because the front ones are still on my engine unplugged, not cut like these.





    Thanks for the quick information on this. One more question on this. Since these are the rear, as you stated, I will not need these at all and you suggest to remove them completely and does this need to be programmed into the PCM when I have that done? I have not taped the harness back up yet for reasons like this so I can alter it in case of need to remove/add something else.
    Last edited by Bear; 01-21-2013 at 10:35 AM.
    1994 Chevy C1500 RCSB 05' DBW 5.3 Conversion Complete
    My build

    Coming soon ....... Full Repaint, 214/220 Cam, Yukon Posi with 3.73's, remove body lift

  6. #6
    Join Date
    Dec 2004
    Location
    San Antonio, TX Area
    Posts
    1,757
    Yes they will be removed in the PCM by the tuner.
    "ALisSa1 Silverado"
    1990 Chevrolet RCSB 2002 Chevrolet Camaro LS1/4L60E
    Scrimpin Ain't Easy
    ( . Y . )


  7. #7
    Join Date
    Aug 2011
    Location
    Ellsworth Air Force Base, SD
    Posts
    143
    Thanks guys. Here are some more updates that I got accomplished today. The DBW pedal and TAC module are in place. To start, the new DBW pedal is larger and longer than the previous TBI pedal. When I first bolted it down using only the factory bottom bolt for the old pedal the new DBW pedal was touching the transmission tunnel. I cut the pedal in half between the "S" bend or dog leg and then slid one over the other and held it together with a visegrip to check how it fit. Now the 2 will be TIG welded back together tomorrow.





    Looks pretty natural when looking down from the drivers seat.



    I then sized up the firewall plug and matched it to the correct hole saw size. After making the hole and a extensive de-burring, I fed the wire and and plug through. Its a tight fit like the factory would have intended. I then select the place on the firewall to mount the TAC module. Here are some pics of completion.





    1994 Chevy C1500 RCSB 05' DBW 5.3 Conversion Complete
    My build

    Coming soon ....... Full Repaint, 214/220 Cam, Yukon Posi with 3.73's, remove body lift

  8. #8
    Join Date
    May 2007
    Location
    Oak Forest, Illinois
    Posts
    275
    I noticed you still have the cruise control unit mounted to the firewall. The TAC module handles the cruise function of the DBW setup and mounts directly into the same location as the cruise unit.

    Jeff
    98 GMC RCSB 2wd, 100% internally stock 305, w/twin T-3 junkyard turbos,Ramjet intake w/42lb inj,12200411 PCM. 4675lbs w/me in it. Best time in 5 passes 13.01@110

  9. #9
    Join Date
    Aug 2011
    Location
    Ellsworth Air Force Base, SD
    Posts
    143
    Thanks, wish I would have known that earlier. I am glad that I don't need that thing and it will get removed immediately when I get off work tomorrow. Any advice on how to incorporate the factory cruise control functions in the cab to make this work? Thanks for chiming in, I can use all the help I can get.
    1994 Chevy C1500 RCSB 05' DBW 5.3 Conversion Complete
    My build

    Coming soon ....... Full Repaint, 214/220 Cam, Yukon Posi with 3.73's, remove body lift

  10. #10
    Join Date
    Aug 2011
    Location
    Mabank, Texas
    Posts
    60
    looks great! Thanks for keeping us posted, interesting swap.
    2002 Chevy Silverado 2500 HD. CAI, 4.10's, 35x12.50 r17 Kumho Road Venture M/T's. Nelson Tuned.

    2002 Z28 Camaro- Small budget cam build. Full bolt on, Custom grind Comp Cam, LS6 intake, 4000 CircleD stall, Nelson Tuned.

    2008 Dodge 2500- H&S MiniMax, CAI, DPF delete, EGR delete, AirDog fuel system.

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