High-Probability Causes:
* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer the position of the crankshaft. A faulty CKP sensor will prevent the engine from receiving the necessary signals to maintain combustion, leading to stalling. This is a common cause of stalling, especially in older vehicles.
* Cam Position Sensor (CMP): Similar to the CKP sensor, a faulty CMP sensor prevents proper timing of the valves, resulting in stalling.
* Mass Air Flow Sensor (MAF): This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor can provide inaccurate readings, leading to a lean or rich fuel mixture and stalling. Cleaning the sensor is often a first step in troubleshooting.
* Throttle Position Sensor (TPS): This sensor tells the engine's computer the position of the throttle. A faulty TPS can cause erratic idling and stalling.
* Fuel Delivery Problems:
* Fuel Pump: A weak or failing fuel pump might not deliver enough fuel under load, causing stalling.
* Fuel Filter: A clogged fuel filter restricts fuel flow, leading to similar symptoms.
* Fuel Injectors: Clogged or faulty fuel injectors can prevent proper fuel delivery.
* Ignition System:
* Ignition Coil(s): A failing ignition coil can prevent one or more cylinders from firing, potentially leading to stalling. This is often accompanied by misfires.
* Spark Plugs/Wires: Worn or damaged spark plugs or wires can cause misfires and stalling.
Less-Likely (but Still Possible) Causes:
* Vacuum Leaks: Leaks in the vacuum system can disrupt the engine's operation.
* Transmission Problems: While less common as a direct cause of stalling, transmission issues can sometimes indirectly lead to stalling (though usually accompanied by other transmission symptoms).
* Computer/ECM Problems: A malfunctioning Engine Control Module (ECM) can cause a wide range of issues, including stalling. This is usually diagnosed last.
* Alternator: While not directly causing stalling, a failing alternator can prevent the battery from recharging, leading to stalling eventually if the battery is low.
Troubleshooting Steps:
1. Check engine light: Is the check engine light on? If so, have the codes read at an auto parts store (often free) or a mechanic. The codes will point to specific potential problems.
2. Check obvious things: Inspect fuel level, visually check for any obvious vacuum leaks, and make sure the battery terminals are clean and tight.
3. Start with the easier checks: Clean the MAF sensor (carefully, following instructions). Inspect spark plugs and wires.
4. Professional Diagnosis: If you're not comfortable performing these checks, or if the problem persists after basic checks, take your MPV to a qualified mechanic for diagnosis. They have the tools and expertise to properly diagnose the issue.
Remember that diagnosing car problems can be complex. Starting with the high-probability causes and systematically checking them is the best approach. Safety first – if the vehicle is stalling dangerously, don't drive it until it's fixed.
