Car idles low when stopped, As the plugs age, carbon deposits build up on the tip, making them less effective at starting this ignition process. Learn how to fix a car with high or low idle, and learn how to fix a car that idles up and down by cleaning the idle air control valve. Car idle low happens for various reasons, mainly when a sensor malfunction occurs and your car’s control valve is either clogged or faulty; these will all affect the idle speed of your vehicle. An EGR Valve Issue. If the vehicle engine idles below 700 rpm there is a good . Throttle Body. This process helps to decrease the internal temperature. We would like to show you a description here but the site won’t allow us. A “rough” idle is just like a normal idling engine speed, except it is irregular and not Fouled Spark Plugs. Aug 31, 2025 · In this comprehensive guide, we’ll uncover the most common reasons to answer the question of Why Does My Car Stall When Idling , how to diagnose them step-by-step, and what you can do to fix it—whether you’re a DIYer or taking it to a shop.


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