THE A/F TUNING MODULE IS DESIGNED TO ALLOW AIR FUEL CORRECTIONS ON MODIFIED FUEL INJECTED ENGINES. IE; STROKER/BIG BORE ENGINES, HIGH FLOW CYLINDER HEADS, PERFORMANCE CAMSHAFT, AND PERFORMANCE EXHAUST SYSTEMS. IT IS EXPECIALLY USEFUL FOR LEAN FUEL PROGRAMMING UNDER CRUISE CONDITIONS WITH THE STOCK ENGINE MANAGEMENT SYSTEM (ECU). IT IS BEST TO RESTORE ALL PREVIOUS MODIFICATIONS TO STOCK SETTINGS; AIR FLOW METER, TIMING, AND INJECTOR SIZING AND WITH THE AID OF A MIXTURE METER ESTABLISH A SAFE A/F RATIO UNDER ALL DRIVING CONDITIONS. PAY PARTICULAR ATTENTION TO THE LIGHT THROTTLE CRUISE CONDITION AT HIGHWAY SPEEDS, THEN GO AHEAD AND TUNE THE AIRFLOW METER AND IGNITION TIMING FOR BEST ACCELERATION.

The Pro Air Fuel Tuning Module operates by allowing the computer to think that the engine is cold and then broadens the pulse width of the four injectors. The Pro Air Fuel Tuning Module will richen the mixture only. If the engine is running in a rich condition without the tuning module, a tuning issue could exist and proper diagnosis from a certified mechanic will be required.

INSTALLATION INSTRUCTIONS

1. DISCONNECT BATTERY NEGATIVE LEAD
2. LOCATE A SUITABLE LOCATION TO MOUNT THE A/F MODULE INSIDE THE CAB WHERE IT IS EASY TO MAKE ADJUSTMENTS.
3. REMOVE RIGHT SIDE KICK PANEL TO ACCESS ECU WIRING HARNESS.
4. CAREFULLY REMOVE 4 TO 6 INCHES OF PROTECTIVE TAPE AT THE ECU HARNESS SOCKETS.
5. LOCATE THE THW WIRE, AND THEN CUT THE WIRE APPROXIMATELY 2 TO 3 INCHES FROM THE SOCKET.
6. STRIP 3/16 INCH OF INSULATION AND SPLICE EACH OF LEADS FROM THE MODULE TO EACH END OF THE CUT THW WIRES WITH THE SUPPLIED TERMINALS AND SHRINK TUBING.
7. DETERMINE THE OPTIMUM POSITION WITH THE USE OF A MIXTURE METER OR UNTIL YOU GAIN A SLIGHT RPM INCREASE AT IDLE. IF THE ENGINE HESITATES, MISSES AND SMOKES OR THE CHECK ENGINE LIGHT COMES ON, IT IS TOO RICH. REDUCE YOUR ADJUSTMENT

IT IS PREFERABLE TO USE AN OHMMETER TO VERIFY THE THW LEAD. YOU MUST DISCONNECT THE ECU MULTI-PLUG AND BACK PROBE THE COOLANT SENSOR SOCKET (GREEN SENSOR BELOW THERMOSTAT) AND THW LEAD AT THE ECU. SEE ATTACHED APPLICATION TABLE FOR YOUR PARTICULAR VEHICLE.