First the motor and transmission were removed. This is a mess of a job since the wiring harness runs through the middle of the intake manifold the intake must be removed and the motor half dissambled to get to all of the electrical connections. I highly recommend getting a good service manual to help lead you through this mess. Bently is by far the best manual out there and has excellent wiring diagrams which are necessary to figure out the gauges and electrical interface between the LS1 and the BMW. This left a mess of engine harness and ECM wiring. The wiring harness was removed by cutting wires that fed back to the power distribution center (PDC). There is also a harness that plugs into the PDC. All wires in this harness that went to the motor were also cut.
Without the service manual most sensor wires that lead back to the instrument panel can be identified if care is taken during the tear down stage. I think the only one that can't be traced is the tach signal. See electrical page for schematics and pinouts.
After removing the engine wiring harness all of the chassis and body electrical still worked!! Whew!!!
Click on image to enlarge
Motor / Trany Removed
Close up of Wires to be Cut
Close up of Remaining Wires
Booster M/C ABS Removed
Next I removed all of the front suspension and stering rack. This makes it easier to access the motor compartment when the motor is fitted. The rack needs to be replaced anyhow so its a lot easier now.
Last I removed the Booster, Master Cylinder, and ABS unit. The vacuum booster and ABS were removed as there was a hard interference with the motor. I will replace the vacuum booster with a compact hydraulic booster from a 4.6L mustang.
I considered relocating the ABS but since I don't personally like ABS and the wheel speed sensors wires had been damaged previously I elected to remove it.