Fuel System Related:
* Fuel Pump: A weak fuel pump might not be able to maintain sufficient pressure when the fuel level is low or when the car is maneuvering sharply. The pump's ability to draw fuel is affected by its position and hard turning can disrupt this process.
* Fuel Filter: A clogged fuel filter restricts fuel flow, and this restriction becomes more pronounced under higher demand (like acceleration or when the pump struggles during cornering).
* Fuel Pressure Regulator: A faulty fuel pressure regulator could be allowing too much fuel to return to the tank, leading to insufficient pressure at the injectors, particularly under load or when the car is tilted.
* Pick-up tube in fuel tank: The fuel pump's pick-up tube might be clogged, kinked, or not submerged enough in the fuel. Hard turning alters the fuel's position in the tank, potentially uncovering the pick-up.
* Loose Fuel Line Connections: A loose or damaged fuel line could introduce air into the system, disrupting fuel delivery. The movement during turns could temporarily worsen a slightly loose connection.
Ignition/Electrical System Related:
* Crankshaft Position Sensor (CKP): This sensor is crucial for ignition timing. Its signal can be affected by vibrations and changes in engine angle during sharp turns. A failing CKP sensor would cause misfires and stalling.
* Distributor (if equipped, though less likely on a '90 5.0): A worn distributor cap, rotor, or ignition wires can cause intermittent misfires, especially under stress like hard cornering. Changes in engine angle can temporarily disrupt contact.
* Mass Airflow Sensor (MAF): A dirty or faulty MAF sensor provides incorrect air/fuel mixture information to the computer. This could lead to stalling, especially at idle, which is a sensitive operating condition.
* Ignition Coil: A failing ignition coil might not provide sufficient spark under load or when the engine is subjected to movement from cornering.
* Battery/Alternator: While less directly related, a weak battery or alternator can cause voltage drops that disrupt the fuel pump or ignition system. The increased load from the electric fuel pump during a corner might exceed the limited capacity of a weak battery.
Other Possibilities:
* Vacuum Leaks: Leaks in the vacuum lines can affect idle control and exacerbate problems with fuel delivery or ignition timing. Movement from cornering might cause a small leak to temporarily become more significant.
* Idle Air Control (IAC) Valve: A dirty or faulty IAC valve regulates air flow at idle. Problems here manifest most often at idle.
Troubleshooting Steps:
1. Check fuel pressure: This is the most critical step. You'll need a fuel pressure gauge to measure pressure at the fuel rail. Compare it to the manufacturer's specifications.
2. Inspect fuel filter and lines: Look for any cracks, kinks, or loose connections. Replace the fuel filter as a preventative measure.
3. Check the battery and alternator: Ensure they're charging properly.
4. Listen for fuel pump noise: Can you hear the fuel pump prime when you turn the key? A weak pump will often have a whining sound.
5. Inspect the ignition system: Check the distributor (if equipped), cap, rotor, and wires for wear or damage.
6. Have a diagnostic scan done: A professional scan tool can reveal trouble codes stored in the car's computer, giving you clues about the problem.
It's recommended to start with the fuel system checks (pressure, filter, lines). If those are OK, move on to the ignition system and then the sensor checks. This methodical approach will likely lead you to the cause of the stalling. This is a complex issue and might require professional help for proper diagnosis and repair.
