2001 Ford Mustang Lean Fuel

Engine Performance problem
2001 Ford Mustang V8 Two Wheel Drive Automatic

My "service engine" light is on and when I diagnosed it, it read that my fuel is too lean. So I cleaned the Air Filter, replaced the Fuel Filter cause it was time to do that anyways, and cleaned my Mass Air Flow Sensor. It didn't work, and so I'm probably looking in the wrong places, what else should consider when trying to fix this?
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Tuesday, June 10th, 2008 AT 11:31 PM

1 Reply

A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)

* TIP: On many Fords, a P0171 and/or P0174 Lean Code may sometimes appear because of a bad Differential Pressure Sensor (DPFE). This sensor monitors EGR flow, and is located on the engine near the EGR valve. There are two hoses that connect the sensor to the tube that runs from the exhaust manifold to the EGR valve. The sensor misreads EGR flow and the computer increases EGR which has a leaning effect on the fuel mixture. The fix is to replace the DPFE sensor
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Tuesday, June 10th, 2008 AT 11:40 PM

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