Flex Fuel Module Installation
Installation of COBB Flex Fuel Module
The COBB Flex Fuel Module is designed to be bolted to the inter-cooler support bracket and plugged into the COBB Ethanol Sensor, in-line with the factory Rear O2 sensor and Tumble Generator Valve (TGV).
The Rear O2 connector obtains 12V power, and does not alter the O2 sensor signal going to the ECU. The TGV connection allows the motor signals to pass through for those still using the factory TGV's, however the feedback normally used to check TGV position is used to transmit Ethanol content data to the ECU (Engine Control Unit).
Mounting location may vary by customer/ installer preference, however it is recommended to seal any un-used connections from water intrusion, ideally by using the proper connector mate and using plugs to seal the mating connector.
Bolt the Flex Fuel module to the inter-cooler support bracket using the included bolt. Straighten the cables so that they aren't crossed over each other.
- Pass the Flex Fuel Connector through the factory hoses and wiring harnesses and plug it into the Ethanol sensor. Ensure there is no strain on the connector, wiring, or the module.
- Pass the TGV Connector through the factory hoses and harnesses to the TGV position sensor on the driver's side of the vehicle toward the rear of the engine. Especially if on a lift, you may find this easier to do from the bottom of the vehicle where there's a clear path to the TGV. Ensure there is no strain on the TGV connector, wiring, or the module.
- Route the Rear O2 Connector to the bottom of the engine bay, then suitably raise and support the vehicle. Never work on a vehicle supported by a jack alone.
- Connect the Rear O2 Connector between the factory O2 sensor harness and the O2 Sensor connector.
- The O2 connector harness has extra length to work on a variety of vehicle configurations. Using the included zip-ties, secure the harness to the metal lines on the underside of the vehicle and in the engine bay. Ensure that the harness will not make contact with moving parts like the steering column, exhaust parts, and has sufficient slack between the engine and lines as well as lines and harness so that there is no strain as the engine moves.
- Power your car on but don't start it quite yet. Go under the hood and check for leaks from the fuel lines.
- Flash an appropriate map for your modifications.
- Go out and enjoy!