* Crankshaft Position Sensor (CKP Sensor): This sensor is crucial for the engine's timing. Heat can cause them to fail intermittently, leading to the engine stalling. When it cools down, it might work again temporarily.
* Ignition Module: Similar to the CKP sensor, the ignition module can be affected by heat. It controls the spark to the plugs. Failure leads to loss of spark and stalling.
* Fuel Pump Relay or Fuel Pump: The fuel pump might be struggling to keep up under heat. The relay could be failing due to heat, preventing power from reaching the pump. A weak pump will struggle, especially when the engine is warm.
* Mass Airflow Sensor (MAF Sensor): This sensor measures the amount of air entering the engine. A faulty MAF sensor can lead to incorrect fuel mixture, causing the engine to stall, especially under heat.
* Distributor Cap and Rotor (if applicable): Cracks or corrosion in the distributor cap and rotor can cause intermittent misfires, leading to stalling. Heat can exacerbate these problems. (Note: Some 1992 LeSabres may have distributorless ignition systems; this only applies if your car has a distributor.)
* Coolant Temperature Sensor: While less likely to directly cause stalling, a faulty coolant temperature sensor provides inaccurate readings to the engine's computer (PCM). This can lead to poor fuel mixture and potential stalling issues, particularly under heat.
* Wiring Issues: Heat can cause wires to short or fray, leading to intermittent electrical failures. Check all wiring, especially around the ignition system and fuel system components.
* Alternator: Though less likely to cause an immediate shutoff, a failing alternator can cause a voltage drop. This might manifest as intermittent stalling as the voltage fluctuates.
Troubleshooting Steps (in order of likely cause and ease of checking):
1. Check Engine Light: See if the check engine light is on. Get the diagnostic trouble codes (DTCs) read using an OBD-II scanner. This is the easiest and most informative first step.
2. Visual Inspection: Check for obvious signs of damage – loose or corroded connections, damaged wiring, etc., particularly in the engine bay.
3. Check the CKP Sensor: This is often a good place to start given its heat sensitivity. It's relatively easy to access and replace.
4. Listen to the Fuel Pump: When you turn the key to the "on" position (but don't start the engine), you should hear the fuel pump prime for a couple of seconds. If you don't hear it, the pump or relay might be the problem.
5. Professional Diagnosis: If you're not comfortable working on your car yourself, take it to a qualified mechanic. They have the tools and expertise to diagnose the problem accurately.
Remember safety first. Work on a cool engine, disconnect the battery's negative terminal before working on the electrical system, and be aware of hot surfaces under the hood. If you're unsure about any repair, seek professional help.
