What Causes Occasional Engine Shaking When Stopped at a Red Light?
4 Answers
The main reasons for occasional engine shaking when stopped at a red light are: 1. This is a resonance phenomenon caused by the engine, frame, leaf springs, and tires. The solution is mainly to adjust the engine speed slightly higher or lower. 2. It may be caused by natural wear or deformation of bearings and ball joints. Many minor deformations are actually completely imperceptible to the naked eye, but as vehicle speed increases and centrifugal force grows, the oscillating effect caused by bearing deformation becomes more pronounced; hence, the faster the speed, the greater the shaking. Here is some additional information: 1. Function and types: An engine is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, jet engines, electric motors, etc. For example, internal combustion engines typically convert chemical energy into mechanical energy. 2. Introduction and history: The term engine can refer to both the power-generating device and the entire machine including the power unit. The engine was first developed in England, so the concept of an engine originates from English, with its original meaning referring to "a mechanical device that generates power."
I've experienced occasional engine shaking when waiting at red lights, which is often due to carbon buildup or ignition system issues. Over time, carbon deposits accumulate inside the engine, affecting combustion efficiency, especially more noticeable during idle. Another common cause is aging spark plugs or faulty ignition coils leading to irregular sparks and intermittent shaking. I encountered this before and solved it by replacing the spark plugs. A dirty idle control valve could also be the culprit - it maintains stable RPM when stopped, and if clogged, causes unstable idle speed. Fuel system problems like slightly clogged injectors or unstable fuel pressure can disrupt smooth fuel delivery too. Don't overlook worn engine mounts either - hardened mounts transmit more vibration when idling at stops. I recommend starting with simple checks like inspecting spark plugs or adding fuel system cleaner. If frequent, better get a quick diagnostic at a repair shop to prevent minor issues escalating. Regular maintenance like periodic throttle body cleaning helps prevent such shaking.
I think the occasional engine shaking at red lights is mostly caused by minor faults in the idle control system due to unstable idling. Possible reasons include a dirty throttle body obstructing airflow, uneven fuel injection from uncleaned injectors, or inaccurate ignition timing from worn spark plugs. I've done similar checks myself before - first unplug the ignition coil to check for loose connections, then clean the intake tract and throttle body with some cleaner (an easy fix). Additionally, incorrect air-fuel ratio is a major factor; if the oxygen sensor or mass airflow sensor malfunctions, the ECU can't properly adjust the fuel mixture. Electrical issues like loose battery terminals causing unstable power supply could also be culprits. Worn or cracked engine mounts can amplify vibrations when stationary. I recommend starting with basic maintenance - replace spark plugs or clean sensors. DIY solutions are cost-effective, but safety first; if shaking persists frequently, get it checked by a mechanic immediately.
My car occasionally shakes when stopped at a red light. This issue isn't complex but needs prompt attention. Carbon buildup is one of the main culprits - deposits in the engine affect combustion and are more noticeable at idle. Worn spark plugs or aging ignition coils can also cause random misfires, making the engine tremble. On the fuel side, clogged injectors disrupting proper fuel delivery can lead to RPM fluctuations. If the idle air control valve gets dirty and blocked, it can't properly regulate air intake. These minor issues accumulating cause shaking when stationary. Worn or deformed engine mounts will make idle vibrations more pronounced. Don't delay if you notice shaking - get it checked immediately to prevent worsening.
