Is an idle speed of 800 RPM normal?

[StDonovan]

An idle speed of 800 RPM is normal. Three-cylinder engines: Most three-cylinder engines idle at around 900 RPM because they exhibit noticeable vibration, so the idle speed is increased to mitigate this effect. In contrast, 6-cylinder, 8-cylinder, and 12-cylinder engines typically have lower idle speeds, around 500-700 RPM. This is because engines with more cylinders run more smoothly, allowing them to maintain stable operation even at lower idle speeds without noticeable vibration. Therefore, engines with more cylinders tend to have slightly lower idle speeds. Cold starts: After a cold start, when the engine temperature has not yet reached its optimal operating range, the fuel injectors automatically increase fuel delivery to raise the engine speed. A cold idle speed between 1200 and 2000 RPM is completely normal. Once the engine warms up (usually after about one minute of idling), the speed will automatically decrease to below 1000 RPM.

[ElizaMarie]

I've been driving for over a decade and found that an idle speed of 800 RPM is quite normal for most gasoline-powered cars. For example, my Nissan compact car idles slightly higher at around 900 RPM during cold starts, but stabilizes at approximately 800 RPM once the engine warms up. If the idle becomes unstable, with the tachometer fluctuating up and down or dropping below 600 RPM or exceeding 1000 RPM, you should pay attention. Possible causes include carbon buildup blockages, faulty mass airflow sensors, or aging spark plugs. Ignoring these minor issues can affect fuel consumption and even lead to stalling. Remember, observing the idle condition after the engine has warmed up provides the most accurate assessment. If the problem persists, it's advisable to have it checked at a professional repair shop.

[SanViolet]

I don't think an 800 RPM idle speed is anything to make a fuss about in regular car models. During my daily driving, the normal engine speed range is 600-900 RPM, with 800 being the median value. But it depends on specific conditions—for example, when the AC is on and the load increases, it's normal for the idle speed to rise to 900. If you're concerned, pay attention to unusual noises or unstable idling, as those could be signs of potential issues like a dirty throttle body or idle control valve problems. Don't rush to repairs—try driving at high speeds first; sometimes carbon deposits clear out naturally and things return to normal. In short, stability is key—too high or too low is when you should worry.

[MaximusLee]

An idle speed of 800 RPM is generally acceptable. I've driven both new and old cars, and gasoline engines typically idle within this range. If the engine runs smoothly without vibrations when warmed up, there shouldn't be major issues. However, significant RPM fluctuations or readings outside the normal range could affect driving safety. It's advisable to monitor the coolant temperature gauge – higher idle speed when cold is normal, but if it remains low after warming up, an inspection is recommended. Regular maintenance can prevent most minor malfunctions.