Understanding the Problem:
* Idle Motor: The idle motor (also known as the idle air control valve or IAC valve) controls the engine's speed when the engine is at idle (not accelerating).
* Symptoms: Your description of the car running fine at startup, but stalling when you accelerate, indicates a problem with the idle motor. The check engine light likely points to a code related to the idle control system.
* Stalling: When you hit the gas, the engine needs more air to run smoothly. If the idle motor is malfunctioning, it might not be able to provide enough air, causing the engine to stall.
Troubleshooting Steps:
1. Check Engine Light: Get the check engine light code read by a mechanic or use a code reader yourself. This will pinpoint the exact issue.
2. Inspect the Idle Air Control Valve:
* Location: The IAC valve is usually located on the throttle body, which is connected to the intake manifold.
* Visual Inspection: Look for signs of damage, cracks, or dirt buildup. Clean the valve with a throttle body cleaner if necessary.
* Test for Proper Operation: Try moving the valve manually. It should move freely with a click or spring action. If it's stuck or doesn't move smoothly, it likely needs replacement.
3. Check Fuel Pressure: A low fuel pressure can also cause stalling, so have it checked.
4. Inspect for Vacuum Leaks: Vacuum leaks can disrupt the engine's air intake and lead to stalling. Look for any loose or cracked hoses.
5. Consider Other Components: While the idle motor is the most likely culprit, other parts like the throttle position sensor (TPS) or the mass airflow sensor (MAF) can contribute to similar symptoms.
Possible Solutions:
* Replace the Idle Air Control Valve: If inspection reveals a damaged or malfunctioning IAC valve, it needs replacement. This is a relatively simple repair.
* Clean the Throttle Body: Cleaning the throttle body can help improve airflow and address issues related to buildup.
* Check and Replace Other Components: If the idle motor is working correctly, further diagnosis might be required to address other potential issues.
Professional Help:
It's recommended to consult a qualified mechanic, especially if you're not comfortable performing these checks yourself. They can accurately diagnose the problem and ensure the proper repairs are made.
Safety Note: Always exercise caution when working on your car. Disconnect the battery before working on electrical components and use appropriate safety gear.
