1. Diagnose the Problem:
* Check Engine Light (CEL): This is your first clue. Get the diagnostic trouble codes (DTCs) read. You can do this in a few ways:
* OBD-II Scanner: Buy a relatively inexpensive OBD-II scanner from an auto parts store. This will give you the specific codes, which are crucial for identifying the problem.
* Auto Parts Store: Most auto parts stores will read the codes for free.
* Mechanic: A mechanic will have the most advanced diagnostic equipment.
* Symptoms: Note *all* the symptoms you're experiencing beyond the CEL. Is the engine running rough? Is the fuel economy drastically reduced? Does the car hesitate or stall? Is the engine misfiring? This information helps narrow down the possibilities.
2. Common Causes of Fuel Computer Data Errors (based on DTCs):
Once you have the DTCs, you can research what they mean. However, some common culprits include:
* Faulty Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor will send incorrect information to the fuel computer, leading to improper fuel delivery. Cleaning the sensor (carefully, following instructions) might solve the problem, but replacement might be necessary.
* Faulty Oxygen Sensor(s) (O2): These sensors measure the amount of oxygen in the exhaust. Faulty O2 sensors provide inaccurate feedback to the computer, affecting the air/fuel mixture. They can be replaced individually.
* Bad Crankshaft Position Sensor (CKP): This sensor tells the computer where the engine's crankshaft is positioned. A bad CKP sensor can cause starting problems or rough running.
* Faulty Throttle Position Sensor (TPS): This sensor tells the computer the throttle position. A malfunctioning TPS can affect fuel delivery and idle.
* Fuel Pump Problems: A weak or failing fuel pump can cause low fuel pressure, leading to poor performance and engine codes.
* Fuel Injectors: Clogged or malfunctioning fuel injectors can disrupt the fuel delivery system.
* Wiring Issues: Damaged or corroded wiring related to the fuel system can interfere with the signals between sensors and the computer.
* PCM (Powertrain Control Module) Failure: In rare cases, the fuel computer itself might be faulty. This is usually a last resort diagnosis and often expensive.
3. Fixing the Problem:
* Addressing the DTCs: Based on the codes, you can tackle the specific problem. This might involve cleaning, replacing a sensor, repairing wiring, or replacing a fuel pump.
* DIY vs. Professional: Simple repairs like cleaning a MAF sensor are relatively easy DIY tasks. Replacing components, however, often requires specialized tools and knowledge. If you're not comfortable working on your car, it's best to take it to a qualified mechanic.
Important Considerations:
* Safety First: Working on your vehicle can be dangerous. Always disconnect the negative battery terminal before starting any repairs.
* Obtain Correct Parts: Use only high-quality replacement parts from reputable sources.
* Clear Codes After Repair: After fixing the problem, use your OBD-II scanner to clear the diagnostic trouble codes. This will reset the computer and allow it to relearn the proper fuel delivery parameters.
If you're not mechanically inclined, it's strongly recommended to take your Windstar to a qualified mechanic for diagnosis and repair. Improper repairs can lead to further damage and costly repairs. Provide them with the DTCs you've obtained. They'll be able to pinpoint the cause of the fuel computer data error efficiently and safely.
