Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 33)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 26
The main-harness-to-injector harness connection should be made on the end of the engine opposite the
ignition distributor.
Injector Wire Harness diagrams, and pin out information, for Chevy (Chrysler), Ford and Buick V6
applications, are available on the BigStuff3 website via the following links:
 Chevy (and Chrysler) -
http://bigstuff3.com/pdf/Visio-chevy%20Injector%20Harness.pdf .
 Ford -
http://bigstuff3.com/pdf/Visio-Ford%20Injector%20Harness.pdf .
 Buick V6 -
http://bigstuff3.com/pdf/Visio-Buick%20Injector%20Harness.pdf .
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.
The WBO2 sensor threads into the sensor mounting bung [(optional) (see picture below)], which needs
to be drilled and welded into the exhaust pipe. Before drilling and welding read the design guidelines
below.
 Install mounting bung approximately 8” – 12” from where the primary pipes enter the exhaust
collector.
 Make sure the mounting location selected does not allow condensation to collect directly in
front of the sensor. Make sure there are no depressions, projections, edges, etc. in the exhaust
pipe near the sensor tip.
Main Wire Harness side
connector for O2 Sensor.
This connector mates with
Main Harness Wide Band
O2 connector