Is It Normal for the Engine to Shake at 800 RPM Idle but Smooth Out at 1000 RPM?
3 Answers
It is not normal for the engine to shake at 800 RPM idle but smooth out at 1000 RPM. Once such an issue occurs, it is necessary to check whether the engine's idle speed control valve is malfunctioning. Engine shaking at idle can lead to increased fuel consumption, sluggish acceleration, and carbon buildup inside the engine during vehicle operation. Below is an extended explanation: Vehicles should not maintain idle operation for extended periods: Prolonged idling can cause excessive carbon buildup inside the engine, resulting in reduced power during driving. The normal idle operation time for a vehicle is 3-5 minutes. If this duration is exceeded, the vehicle should be turned off.
The car I drive sometimes shakes a bit at 800 RPM when idling, but becomes stable when the RPM increases to 1000. This doesn't feel completely normal. It could be a carbon buildup issue; dirty throttle bodies or fuel injectors can easily cause uneven combustion at low RPMs, leading to shaking. I've encountered similar situations before, and changing the spark plugs or cleaning the intake tract fixed it. If left unattended, it might consume more fuel in the short term and damage engine components in the long run. I recommend getting a professional inspection at a specialized shop. After all, low-RPM shaking affects driving comfort and safety, especially during repeated starts in city traffic jams, which can be quite annoying. Regular maintenance can prevent this issue, and keeping the engine running smoothly is the key.
As someone who frequently tinkers with cars, I find it quite unusual when the engine shakes at 800 RPM but runs smoothly at 1000 RPM. This often stems from an aging ignition system or minor faults in the air sensor, where insufficient pressure at low RPM amplifies the vibrations. From my own tests, cleaning the MAF sensor or checking the spark plug gaps can often improve the situation. If carbon buildup is the culprit, using some additives to help break it down can be effective. Don't ignore it—the shaking might just be the tip of the iceberg. Delaying repairs can trigger a chain reaction leading to damage in other components, wasting both fuel and money. Routine maintenance is simple; checking the air filter monthly or changing the engine oil can significantly reduce risks.
