Fits for 1986 - 1995 Ford F150 F250 2.8L 4.9L 5.0L 5.8L 7.5L Bronco EGR Simulator Eliminator Delete isconnect your stock EGR valve and breathe life into your motor, while keeping your check engine light off, but active for future problems! This is an EGR valve simulator, which plugs into the stock EGR wiring harness providing the ECU with a closed status; thus keeping the annoying CHECK ENGINE light off and available for other problem codes. Factory locking connector design plugs directly into the stock wiring harness. EGR = Exhaust Gas Recirculation. This device prevents the engine from re-burning exhaust gases. Hence, the engine is always burning fresh fuel and air, thus making more power. It does not have any adverse effects on the motor, it actually helps by not allowing burned exhaust gasses back into the motor.