I have a 2002 Taurus with the 3.0L OHV engine. This car uses the electronic returnless fuel system. I have been having a driveability concern with the vehicle for over a year now.
At highway speeds the car feels like it loses power and misses. I have replaced the plugs, wires, coil, both upstream O2 sensors, PCV valve and hoses. I have cleaned the MAF sensor and back probed the TP sensor to see if voltage rises steadily and smoothly with throttle movement and it did.
I replaced the fuel pump driver module having noticed that the fuel pressure was staying at the bottom of the spec (270 kpa) while driving at highway speeds (with or without the A/C on). The idle pressure immediately rose to about 411 kpa. I checked the pressure with a manual gauge got a reading of around 60 psi. It used to be around 32 psi. Now as I begin to drive, with an increase in speed, the fuel pressure begins to drop. The faster I go the lower the pressure.
I checked the resistance on the Fuel Rail Pressure Sensor using the specs in Ford's Emission Control Diagnostic manual and the resistance on mine is high.
Anyone have anything similar to this. This problem has baffled me and everyone I have presented it to and even the dealerships are unable to help after running diagnostics on the vehicle. I would appreciate any comments or suggestions. Thanks.
At highway speeds the car feels like it loses power and misses. I have replaced the plugs, wires, coil, both upstream O2 sensors, PCV valve and hoses. I have cleaned the MAF sensor and back probed the TP sensor to see if voltage rises steadily and smoothly with throttle movement and it did.
I replaced the fuel pump driver module having noticed that the fuel pressure was staying at the bottom of the spec (270 kpa) while driving at highway speeds (with or without the A/C on). The idle pressure immediately rose to about 411 kpa. I checked the pressure with a manual gauge got a reading of around 60 psi. It used to be around 32 psi. Now as I begin to drive, with an increase in speed, the fuel pressure begins to drop. The faster I go the lower the pressure.
I checked the resistance on the Fuel Rail Pressure Sensor using the specs in Ford's Emission Control Diagnostic manual and the resistance on mine is high.
Anyone have anything similar to this. This problem has baffled me and everyone I have presented it to and even the dealerships are unable to help after running diagnostics on the vehicle. I would appreciate any comments or suggestions. Thanks.