Why does the car occasionally shake at idle speed?

[MasonRose]

Occasional shaking of the car at idle speed can be caused by a fault in the electrical system, or issues with the fuel system and lubrication system. If it's an electrical system fault: It's mostly a problem with the spark plugs, which need to be replaced. If it's a fuel system problem: The throttle may be dirty and needs cleaning. If it's a lubrication system problem: The lubricant may be dirty and needs changing. Below is an introduction to car maintenance: 1. Introduction to car maintenance: Car maintenance refers to the regular inspection, cleaning, replenishment, lubrication, adjustment, or replacement of certain parts of the car as a preventive measure, also known as car servicing. 2. Scope of car maintenance: Modern car maintenance mainly includes the engine system (engine), transmission system, air conditioning system, cooling system, fuel system, power steering system, etc. 3. Purpose of car maintenance: The purpose of car maintenance is to keep the car clean and tidy, maintain normal technical conditions, eliminate hidden dangers, prevent faults, slow down the deterioration process, and extend the service life.

[DelKennedy]

I've been driving for over 20 years, and recently I've noticed that the engine occasionally gives a slight shudder at idle, like it suddenly takes a gasp for breath. This is usually caused by worn-out spark plugs or carbon buildup—worn spark plugs lead to uneven ignition, while carbon deposits make the engine run rough. I remember my old Chevrolet had the same issue a couple of years ago; a check at the dealership revealed poor contact in the ignition coil, and replacing the part fixed it. My advice: first, inspect the spark plugs for cracks or excessive gap; second, clean the throttle body—you can DIY with some cleaner spray. Don't slack on regular maintenance—change the oil and filters on schedule to prevent such issues. An engine is like an old friend—address small problems promptly to keep it running long. If the shaking gets severe on the road, don't push it—pull over safely and handle it then.

[DiRebecca]

As a car repair enthusiast, I believe idle vibration may be related to the engine's electronic systems. It could be due to a dirty or faulty mass airflow sensor causing inaccurate air intake calculations, leading to engine imbalance; or possibly unstable oil pressure where the fuel pump delivers inconsistent fuel supply resulting in vibrations. I recently DIY-cleaned my sensors: just blow them with compressed air - simple and effective. If uncertain, using an OBD scanner to check error codes can quickly pinpoint the issue. Modern cars have highly electronic systems, so regular attention to sensor maintenance, periodic air filter cleaning, and fuel system upkeep can reduce such vibrations. Long-term, electronic system issues not only affect idle but also increase fuel consumption - timely resolution is far more cost-effective.

[OJosephine]

Don't ignore it when your car jerks at idle. This is often caused by excessive carbon buildup in the engine or ignition system failure. I once experienced such jerking and didn't pay attention at first, but it got worse with more frequent jerks, almost stalling at an intersection. Now I regularly check the spark plugs and clean the valves, which isn't hard to do myself: just unplug and inspect to spot any abnormalities. It's a significant safety hazard, as unstable idling can affect braking or turning stability. I recommend doing a quick check under the hood every week and fixing any issues at the repair shop early. Remember, a well-maintained car means safer driving.