What Causes a Car to Have No Idle Speed?
2 Answers
Here are the reasons why a car may have no idle speed: 1. Low car battery voltage: Use a multimeter to test the battery voltage. If it is below 10V, replacement is recommended. If it is around 11V, it can be used temporarily, but prepare for replacement. Above 12V is acceptable. 2. Check for carbon buildup: If the car has run about 20,000 KM, focus on inspecting and cleaning the throttle body. 3. Spark plugs: Inspect, test, and replace the spark plugs if necessary. 4. Control unit: The control unit receives incorrect signals and issues wrong commands, leading to inaccurate idle air intake control and abnormal engine combustion. 5. Idle air: A malfunction in the idle air actuator may cause inaccurate idle air control.
My car has experienced issues with idle stalling. Common causes include a clogged or stuck idle control valve, which prevents air from entering the engine to maintain idle speed. Cleaning it usually resolves the problem. Additionally, a faulty throttle position sensor can lead to unstable idle or complete stalling, as the ECU doesn't receive the correct signal to adjust the air intake. Vacuum leaks in the intake system, such as cracked hoses, allow extra air to mix in, disrupting the air-fuel ratio and causing the idle to drop to zero. Clogged fuel injectors or insufficient fuel pump pressure are also potential culprits, leading to unstable fuel supply. Ignition system problems, like severely fouled spark plugs, can prevent the engine from firing, resulting in no idle. In short, idle issues can easily cause the car to stall at traffic lights, which is both embarrassing and dangerous. I usually inspect these components and promptly send the car for repairs to prevent the problem from worsening.
