Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software - Manual (Page 17)

BigStuff3 Pro SEFI System (LS1)
Version 1.0 16
5. Injector Harness Installation – [Black, 10-way Packard
Connectors (Male & Female)]
Once the main harness is installed and all the connections to it are made, the injector harness can
be installed and connected to the main harness. The standard injector harness is configured to
work with an LS1firing order (1-8-7-2-6-5-4-3). The LS1 injector harness 10-way connector
should be located at the rear of the engine.
The injector harness is constructed with the main
harness connector located half way between the
two banks of fuel injector connectors. The cylinder number is engraved into the injector harness
connector from the factory. Connect the individual injector connectors to each fuel injector.
Lastly, connect the injector harness to the main wire harness.
Back_to_Injector_Harness
6. Wide Band Oxygen Sensor Installation
Once the main and injector harnesses are installed, the Wide Band Oxygen (WBO2) sensor
needs to be installed and connected to the main harness. First, install the wide band sensor.
Main Wire Harness side
connector for O2 Sensor.
This connector mates with
Main Harness Wide Band
O2 connector
Main harness to Injector
harness connector (male)
Injector harness to
main harness
connector (female)
LS1 main wire harness to
injector harness connector
Injector connector cylinder
engravings (cylinders5 & 7
shown)