Deleting the EGR (Exhaust Gas Recirculation) system on a Ford Ranger is a popular modification, often done to improve performance and prevent potential EGR valve issues. This post details a low-budget DIY approach to achieve this.
EGR Delete Procedure
The process began with removing the EGR tube, DPFE sensor (Differential Pressure Feedback EGR), and the EGR valve itself. The EGR tube was then cut, and the threaded nut connecting it to the exhaust was removed. A spare bolt was inserted into this nut and tightened onto the exhaust manifold to seal the opening. The EGR valve vacuum line was plugged using duct tape. A marker cap was used to block the EGR valve opening on the intake manifold, serving as a temporary block-off plate.
After driving for a full tank of fuel with the check engine light illuminated, no noticeable change in fuel mileage was observed. An attempt was made to trick the PCM (Powertrain Control Module) by splicing the DPFE sensor wires to the TPS (Throttle Position Sensor) return signal and ground, as they both operate on a 5V reference voltage and a 0.9V to 5V return voltage. However, this resulted in engine pinging under load, and the wiring was immediately reversed.
Simulating DPFE Sensor Signal
To provide a plausible signal to the PCM, a MAP (Manifold Absolute Pressure) sensor from a 1993 Toyota Camry engine was utilized. This sensor also operates with a 5V reference, signal, and ground, and has a vacuum line input. The EGR vacuum line was connected to the Camry MAP sensor, and the DPFE’s 5V reference, signal, and ground wires were connected to the corresponding pins on the Camry MAP sensor.
At idle, this setup delivered a 3.6V signal to the PCM. Applying external vacuum to the MAP sensor lowered the signal to 1.4V. After several test drives, the check engine light remained off.
Long-Term Viability
While this method initially appeared successful in preventing the check engine light, the long-term viability and potential effects on engine performance remain unknown. Factors such as fuel trims, timing adjustments, and potential long-term damage to the engine or other components are important considerations. Continued monitoring and further adjustments may be necessary.
