Toyota Solara loud idling issue while driving on Toyota Solara

Some Toyota Solara owners report experiencing loud idling issues that may stem from various causes, including vacuum leaks, faulty spark plugs, or ignition coil problems. Additionally, those who hear a buzzing or scraping sound at idle—absent while driving—may be facing issues with specific parts that generate noise only when the vehicle is stationary. Some owners also report shaking during idle, which could indicate a misfire or a bad motor mount. Rough idling may be linked to fuel injector problems, necessitating cleaning to restore proper fuel pressure. Furthermore, if the vehicle runs smoothly on the road but idles roughly, potential culprits include the Throttle Positioning Sensor, ignition coil packs, or cylinder misfires. Lastly, a failing alternator might produce a humming sound that fluctuates with engine RPMs, which can be addressed by disconnecting it from the wiring harness. Diagnosing the specific cause of these loud idling issues is crucial for maintaining the smooth operation of the Toyota Solara.