My Car Engine Has a Rough Idle But Is Fine While Running: What Could Be the Problem?
If your car engine is experiencing a rough idle but runs smoothly while driving, it could be caused by several potential issues. Here are a few possibilities:
- Vacuum leak: A vacuum leak can cause the engine to run lean, resulting in a rough idle. Check for any loose or cracked vacuum hoses.
- Ignition system: Faulty spark plugs, spark plug wires, or ignition coil can also lead to a rough idle.
- Fuel system: A clogged fuel filter or injector can restrict fuel flow, causing a lean condition and rough idle.
- Idle air control valve (IAC valve): The IAC valve regulates the engine's idle speed. A malfunctioning IAC valve can cause the idle to fluctuate or become rough.
- Throttle position sensor (TPS): The TPS provides information about the throttle position to the engine computer. A faulty TPS can send incorrect signals, leading to a rough idle.
Related Questions and Answers:
- What are the symptoms of a vacuum leak? A rapid increase in engine speed upon starting and a rough idle.
- How do I check for ignition system problems? Inspect the spark plugs for wear and damage, and check the spark plug wires for cracks or shorts.
- What is the function of the fuel filter? To remove impurities from the fuel before it reaches the engine.
- What does the IAC valve do? It regulates the engine's idle speed by adjusting the amount of air entering the engine.
- What is the role of the TPS? It provides information about the throttle position to the engine computer, which adjusts fuel and ignition timing accordingly.
Related Hot Sale Items:
- Bosch Platinum Spark Plugs
- NGK Spark Plug Wires
- Delphi Fuel Filter
- Motorcraft Idle Air Control Valve
- Standard Motor Products Throttle Position Sensor
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