* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer where the crankshaft is in its rotation. A failing CKP sensor might provide a signal intermittently, leading to the engine running briefly before dying as the signal is lost. This is a very common cause of this type of problem.
* Camshaft Position Sensor (CMP): Similar to the CKP sensor, but for the camshaft. Intermittent failure can produce the same symptoms.
* Ignition System: Problems in the ignition coil(s), ignition control module (ICM), or ignition wires can cause intermittent misfires or complete lack of spark, leading to the engine shutting down. A weak coil is a particularly likely candidate for intermittent failure.
* Fuel System: While less likely to cause a restart, a partially clogged fuel filter, weak fuel pump, or problems in the fuel injectors could cause fuel starvation. The engine might run briefly on whatever fuel is already in the system before stalling.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A dirty or failing MAF sensor can send inaccurate readings, causing the computer to adjust the fuel mixture incorrectly, leading to stalling.
* Throttle Position Sensor (TPS): A failing TPS can provide incorrect information to the engine computer about the throttle position. This can cause erratic engine operation and stalling.
* Battery/Alternator: A weak battery or alternator might not be able to provide consistent power, causing the engine to die when the demand increases. However, this usually manifests as dimming lights or slow cranking in addition to the stalling issue.
* Poor Connections: Corrosion or loose connections on any of the sensors or electrical components mentioned above can lead to intermittent power loss.
Troubleshooting Steps:
1. Check the obvious: Make sure the battery terminals are clean and tight. Check the fuses.
2. Have the codes scanned: Use an OBD-II scanner to read any diagnostic trouble codes (DTCs) stored by the engine's computer. This is the quickest way to pinpoint a likely problem.
3. Visual inspection: Inspect the wiring harnesses, connectors, and sensors for any signs of damage, corrosion, or loose connections.
4. Focus on sensors: Given the intermittent nature of the problem, prioritize checking the CKP, CMP, MAF, and TPS sensors. These are relatively inexpensive to replace and are frequent culprits in this type of issue.
Without more information, it's impossible to say for certain what's wrong. A proper diagnostic scan and careful inspection are essential to finding the root cause. If you lack the experience, take it to a qualified mechanic.
