Tools You Might Need:
* Jack and jack stands (essential for safety)
* Wrench(es) – sizes will depend on your specific vehicle, likely 10mm, 13mm, possibly others.
* Socket set (with extensions and ratchet)
* Pry bar (possibly)
* Penetrating oil (like PB Blaster)
* Rags or shop towels
* New speed sensor (ensure you get the correct part number for your vehicle)
Procedure (General Steps):
1. Safety First: Park your Caravan on a level surface, engage the parking brake, and chock the wheels. Raise the vehicle using a jack and securely support it with jack stands. Never work under a vehicle supported only by a jack.
2. Locate the Speed Sensor: The speed sensor on a 1991 Dodge Caravan 3.3L is typically located on the transmission case, near the output shaft. It's usually a small, cylindrical sensor with a wire harness connected to it. Consult your repair manual for the exact location; it might be somewhat difficult to access.
3. Disconnect the Electrical Connector: Carefully unplug the electrical connector from the speed sensor. Sometimes a small clip or tab needs to be depressed to release the connector.
4. Remove the Speed Sensor: This is where things can get tricky. The sensor is usually held in place by a bolt or sometimes just friction. Penetrating oil might be necessary to loosen any stubborn bolts. Use the appropriate wrench or socket to remove the sensor. If it's just friction-fit, you might need a gentle pry bar to carefully remove it, being cautious not to damage the transmission case.
5. Clean the Area: Clean the mounting area on the transmission case thoroughly to remove any debris or old gasket material.
6. Install the New Speed Sensor: Carefully install the new speed sensor. If it's bolted in, make sure the bolt is tightened to the manufacturer's specified torque (check your repair manual). If it's friction-fit, push it in firmly and evenly until it seats properly.
7. Reconnect the Electrical Connector: Plug the electrical connector back onto the new speed sensor.
8. Lower the Vehicle: Carefully lower the vehicle using the jack.
9. Test the Speedometer: Start the engine and test the speedometer to ensure it's working correctly. A test drive is recommended.
Important Considerations:
* Repair Manual: A repair manual specific to your 1991 Dodge Caravan 3.3L is highly recommended. It will provide detailed diagrams, torque specifications, and other crucial information.
* Part Number: Double-check the part number of the new speed sensor to ensure it's the correct one for your vehicle.
* Fluid Leaks: Inspect the transmission for any fluid leaks after reinstalling the sensor.
* Professional Help: If you're uncomfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic.
This is a general guide. Improper repair can cause damage to your vehicle. Always refer to a repair manual for your specific vehicle before attempting this repair. If unsure, seek professional help.
