Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software User Manual
Page 10
BigStuff3 Pro SEFI System
Version 2.1 – February 2011
10
Harness
Label
Wire
Color/Connector
Type
Label
Definition
Connect To
Further Details
HEI Black,
4-way
Packard
connector
High Energy
Ignition
[Original
Equipment
(OE) ignition]
Connect to GM
factory installed
ignition system.
Inductive pickup
ignitions will not use
this connection! See
paragraph below titled
“HEI” for further
relevant information.
Cam Gray,
2-way
Packard
connector with a
separate ground
wire (3/8” ring
terminal)
Camshaft
Position
Sensor Input
Connect to the
camshaft
position sensor
on the engine
Used only for injector
phase angle and
individual cylinder
spark control. System
includes a mating 2-
way Packard
connector & terminals.
Crank Black,
2-way
Packard
connector with a
separate ground
wire (3/8” ring
terminal)
Crankshaft
Position
Sensor Input
Connect to the
crankshaft
position sensor
on the engine
System includes a
mating 2-way Packard
connector & terminals.
H2O Black,
2-way
Packard
connector.
Engine
Cooling Fluid
Temperature
Input
Connect to the
GM (only)
coolant temp.
sensor, typically
located on the
intake manifold
Air Gray,
2-way
Packard
connector.
Engine Intake
Air
Temperature
Input
Connect to the
GM (only) air
temp. sensor
typically located
in the air intake
duct between the
air cleaner and
the throttle body
IAC Black,
4-way
Packard
connector
Idle Air Speed
Control (IAC)
input
Connect to the
IAC motor assy
located on or
near the throttle
body.
Meters and controls
intake air around the
throttle blades at idle
and during cold starts.
TPS Black,
3-way
Packard
connector
Throttle
Position
Sensor
The TPS located
at the end of the
throttle shaft on
the throttle body
Senses the position of
the throttle blades [0%
(throttle closed) to
100% (throttle wide
open).