* Crankshaft Position Sensor (CKP): This sensor is crucial for the engine's timing. If it's failing, it might work fine when cold but overheat and fail after the engine warms up a bit, leading to stalling. Once it cools, it might work again.
* Fuel Pump Relay: Similar to the CKP sensor, a failing fuel pump relay could be affected by heat. It might supply power intermittently as things get hot.
* Ignition Module: Another heat-sensitive component that could fail when it gets warm, cutting the spark to the engine.
* Fuel Pump: The fuel pump itself could be weakening with age and heat. It might deliver fuel adequately when cold, but struggle under the increased demands of a warm engine.
* Mass Airflow Sensor (MAF): A faulty MAF sensor can give incorrect readings to the computer, leading to poor fuel mixture. Heat can exacerbate this issue.
* Throttle Position Sensor (TPS): Similar to the MAF sensor, a bad TPS provides inaccurate information to the engine's computer about the throttle's position. Heat could worsen its performance.
* Coolant Temperature Sensor: This sensor provides critical information to the Engine Control Unit (ECU). A faulty sensor could provide inaccurate temperature readings, causing the ECU to make incorrect adjustments and leading to stalling.
* Wiring Issues: Heat can cause wires to short, especially older ones, disrupting electrical signals to various components. Look for any frayed, melted or poorly connected wiring.
Troubleshooting Steps (in order of easiest to hardest):
1. Check for error codes: Use an OBD-I code reader (specific for 1992 vehicles) to scan for any trouble codes stored in the ECU. This will give you a better starting point.
2. Visual Inspection: Look for obvious signs of damage – loose connections, frayed wires, leaks, etc.
3. Check the fuel pressure: This requires a fuel pressure gauge and testing the pressure when the engine is both cold and after it stalls. Low pressure points to the fuel pump, filter, or regulator.
4. Test the CKP sensor: This often requires a multimeter and some technical knowledge. You can find specific instructions online for testing a CKP sensor on a 1992 Suburban.
5. Check the ignition system: This involves testing the ignition coil, wires, and distributor (if applicable).
Important Note: Working on a vehicle's ignition system requires some mechanical knowledge and safety precautions. If you're not comfortable working with car electrical systems, it's best to take it to a qualified mechanic. A misdiagnosed or poorly repaired electrical issue can be dangerous.
