Transmission Problems:
* Low Transmission Fluid: This is the most common and easiest to check. Low fluid can cause poor or no engagement. Check the fluid level and condition (color, smell). Burnt-smelling fluid indicates a serious problem.
* Transmission Problems (Internal): This is a broad category encompassing many possibilities, including:
* Worn clutches or bands: These components wear out over time and can fail to adequately grip, resulting in no forward motion.
* Broken or damaged gears: Similar to worn clutches, damaged gears prevent proper power transfer.
* Solenoid problems: These electrically controlled valves regulate fluid flow within the transmission. A faulty solenoid can prevent proper shifting or engagement.
* Valve body issues: The valve body houses the solenoids and other valves; problems here can cause multiple transmission issues.
* Torque converter issues: This component transfers power from the engine to the transmission. A faulty torque converter might not be locking up properly.
Engine Problems:
* Lack of Engine Power: The engine might be running, but not producing enough power to overcome the transmission and drive train. This could be due to:
* Spark plug issues: Worn or fouled spark plugs can cause misfires and reduced engine power.
* Ignition coil problems: A faulty coil can prevent one or more cylinders from firing.
* Fuel delivery problems: Issues with the fuel pump, fuel filter, or injectors can restrict fuel flow to the engine.
* Engine sensor issues: Faulty sensors (e.g., MAF sensor, TPS sensor) can lead to incorrect fuel/air mixture and reduced power.
Drivetrain Problems:
* Drive shaft problems: A broken or severely damaged driveshaft won't transfer power to the wheels.
* Differential problems: Problems within the differential (rear-wheel drive) can prevent power from reaching the wheels.
* Wheel bearings: Severely worn wheel bearings could seize, preventing wheel rotation.
Other Possibilities:
* Parking brake engaged: A simple, yet easily overlooked issue.
* Shift cable problems: A problem with the shift cable could prevent the transmission from engaging the correct gear, even though the shifter seems to be in the correct position.
Troubleshooting Steps:
1. Check the transmission fluid: This is the absolute first step.
2. Check the parking brake: Make sure it's disengaged.
3. Listen for unusual noises: Grinding, whining, or other noises from the transmission or drivetrain can indicate specific problems.
4. Check engine codes: Use an OBD-II scanner to read any diagnostic trouble codes (DTCs) stored by the car's computer. These codes can provide valuable clues.
If you're not comfortable working on cars, it's best to take the Taurus to a qualified mechanic for diagnosis and repair. Many of the issues listed above require specialized tools and knowledge to diagnose and fix safely.
