Is an Idle Speed of 600 RPM Normal?
3 Answers
An idle speed of 600 RPM is normal for a car. Here is some information about car engine idle speed: 1. Introduction: Car engine idle is one of the engine operating conditions, so the idle performance has a significant impact on emissions, fuel consumption, and comfort. The engine speed at idle is called the idle speed, which should not be too high or too low. If it's too high, it will increase fuel consumption; if it's too low, it will cause unstable idle speed. 2. Normal Idle Speed: The idle speed of a car will vary between cold and hot engine conditions. Generally, for an engine in good working condition when hot, the idle speed is usually between 550-800 RPM.
I've been repairing cars for over a decade, and a 600 RPM idle speed is considered normal in many modern vehicles, especially small-displacement models. As long as there's no shaking or stalling while driving, there's no need to worry. Engine temperature has a significant impact—idle speed is higher during cold starts and stabilizes around 600 RPM once the engine warms up. If you feel the car shaking or notice sluggish acceleration, it's time to check if the throttle body is dirty or has carbon buildup. A dirty throttle body disrupts airflow, causing idle speed to fluctuate. Regular throttle body cleaning or air filter replacement can prevent this, a common issue in older cars. Newer cars are more fuel-efficient, and lower idle speeds are becoming the trend. In short, whether 600 RPM is normal depends on the car's actual condition—don't just focus on the number. Listen for unusual sounds, check the dashboard for warning lights, and if there's an issue, visit a professional shop for a diagnostic scan.
I've been driving to and from work for over 20 years, and 600 RPM idle speed isn't really a big issue. My old Toyota runs just fine at around 600 RPM too. The key is whether the engine runs smoothly - as long as there's no rattling noise or sudden stalling, it's fine. However, low idle speed might affect fuel consumption. I once experienced a sudden surge in fuel consumption when the idle was unstable, which turned out to be due to worn spark plugs. For older vehicles, a weak battery might also struggle to maintain power, making starting difficult. I recommend observing for a few minutes before driving off. Normal idle speed should be between 550-800 RPM, with some variation due to temperature differences. During maintenance, it's good to have the idle control system checked to prevent minor issues from becoming major problems.
