Replacing the CMP Sensor:
This job requires basic mechanical aptitude and some tools. Always disconnect the negative battery terminal before starting any work on your vehicle's electrical system.
1. Locate the sensor: As mentioned above, it’s on the passenger side near the front of the cylinder head. A repair manual (Haynes or Chilton) for your specific year and engine will provide the most accurate diagram and location.
2. Gather tools: You'll need a socket set (likely a 10mm or 8mm, but check your vehicle's specifics), a ratchet, possibly an extension, and a flat-head screwdriver (for disconnecting the electrical connector).
3. Disconnect the electrical connector: Gently unplug the electrical connector from the sensor. Sometimes they're difficult to disconnect; gently wiggle it back and forth while pulling.
4. Remove the sensor: Use the appropriate socket to carefully remove the sensor from the cylinder head. It may be slightly stuck, so use moderate force and avoid stripping the threads. If it's stubborn, consider using a penetrating oil (like PB Blaster) to help loosen it.
5. Install the new sensor: Carefully install the new camshaft position sensor, ensuring it's seated correctly. Hand-tighten it first, then use the socket to tighten it to the manufacturer's specified torque (consult your repair manual). Do not overtighten!
6. Reconnect the electrical connector: Carefully plug the electrical connector back onto the new sensor.
7. Reconnect the battery: Reconnect the negative battery terminal.
8. Test the vehicle: Start the engine and check for any error codes or unusual running conditions. A scan tool (OBD-II reader) can help detect any issues.
Important Considerations:
* Repair Manual: Highly recommended! A repair manual for your specific vehicle will provide detailed instructions, torque specifications, and diagrams.
* Torque Specification: Over-tightening the sensor can damage the threads or the sensor itself. Always refer to the repair manual for the correct torque specification.
* Cleanliness: Keep the area clean to prevent debris from entering the engine.
* Professional Help: If you're not comfortable performing this repair yourself, take your vehicle to a qualified mechanic.
This is a general guide. The exact procedure may vary slightly depending on your specific Aerostar's engine and your level of familiarity with automotive repair. Always consult a repair manual before starting any automotive repair. Incorrectly installing the sensor could lead to further engine problems.
