* Low Transmission Fluid: This is the most common and easiest to check first. Low fluid will cause poor transmission performance and stalling. Check your transmission fluid level (using the dipstick while the engine is running and warmed up) and the condition of the fluid (it should be reddish-pink, not brown or burnt). If low, add the correct type of fluid (consult your owner's manual). However, if the fluid is severely contaminated, you may have a larger problem.
* Torque Converter Issues: The torque converter acts as a fluid coupling between the engine and transmission. Problems like a worn-out torque converter clutch or internal damage can cause stalling when engaging gear. This is more involved to diagnose and typically requires a professional mechanic.
* Transmission Problems: More serious transmission problems, such as worn clutches, low internal hydraulic pressure, or other internal damage, can also cause stalling. These require professional diagnosis and repair.
* Engine Problems: Issues within the engine itself, like a failing idle air control valve (IAC), dirty throttle body, faulty mass airflow sensor (MAF), clogged fuel filter, or weak fuel pump, can cause the engine to lose power and stall when the added load of engaging the gear is introduced.
* Electrical Problems: Faulty connections, a failing ignition switch, or issues with the neutral safety switch (which prevents starting the car unless it's in park or neutral) can prevent the transmission from receiving the proper signal, leading to stalling.
* Vacuum Leaks: A significant vacuum leak in the intake system can cause the engine to run poorly and stall under load.
Troubleshooting Steps:
1. Check the transmission fluid: This is the easiest and cheapest thing to check first.
2. Inspect the battery terminals and connections: Ensure they are clean and tight. A poor connection can cause power fluctuations.
3. Check the engine's idle: Does the engine idle smoothly and consistently when in park or neutral? A rough or low idle is a strong indicator of an engine problem.
4. Listen for unusual noises: When the car stalls, are there any unusual noises coming from the engine or transmission?
5. Check the codes: Use an OBD-II scanner to read any diagnostic trouble codes (DTCs) stored in the car's computer. These codes can provide valuable clues about the problem.
Important Note: Unless you have significant mechanical experience, it's best to take your 1996 Ford Contour to a qualified mechanic for proper diagnosis and repair. Attempting to fix complex transmission or engine problems without the proper knowledge and tools can lead to further damage and increased repair costs.
