14
Pro-Flo EFI Installation Instructions
©2008 Edelbrock Corporation
Brochure No. 63-3527
Catalog #3527, #3528
Rev. 8/08 - AJ/mc
OXYGEN (O
2
) SENSOR
An oxygen sensor, installed on the header collector pipe, measures exhaust gas oxygen content and is used by the ECU to manage fuel delivery
under closed loop control. Installing the sensor requires drilling a 1/2-inch hole in the passenger-side header collector. The sensor is held in
place with the provided fitting which must be professionally welded into place. The red-lean/green-rich light on the Calibration Module is also
controlled by the O
2
sensor. The O
2
sensor is connected to the Main System Harness by Connector J18. Refer to the engine harness diagram on
page 20 of this manual for further detail.
NOTE:
The Pro Flo system is now capable of using either a narrow
band or wide band O2 sensor. The difference between a narrow band
and wide band O2 sensor is the range over which the sensor is
accurate. A narrow band sensor is basically a switch that only tells
the ECU if the air fuel ratio (AFR) is richer or leaner than 14.7 to 1. A
wide band sensor/controller typically has a linear voltage output that
is accurate over a range of 10 to 20:1 AFR. The included wideband
sensor calibration is for use with the Dynojet Wide Band Commander
Air Fuel Ratio Monitor. See http://www.widebandcommander.com for
more information. To select the wideband option, install the included
O2 select jumper as shown in the next section. To use the default
narrow band option, leave the jumper off. A dust cap is provided for
protection when the connector is not in use.
THROTTLE POSITION SENSOR
The Throttle Position Sensor, an integral
part of the Pro-Flo throttle body,
measures throttle angle.
COOLANT TEMPERATURE SENSOR
The Coolant Temperature Sensor is a thermistor device like the Manifold Air Temperature sensor.
Resistance varies as coolant temperature rises and lowers. The Coolant Temperature Sensor is
located at the front of the manifold on the driver’s side.
