According to About.com, there are several reasons vehicles idle low. Common reasons include vacuum leaks, carburetor problems, ignition issues, damaged power circuits and dirty fuel injectors. When a vehicle idles low, the vehicle stalls or shakes excessively when the brakes are activated, and this is an indication of a serious engine problem. Diagnosing low idle issues requires checking the carburetor, fuel pressure regulator and fuel injectors.Know More
Underhood Service states that low idle issues are only a symptom of a more serious problem. A diagnosis of a low idle issue is achieved by checking various parts of the engine. A common issue associated with the carburetor is air problems. This issue occurs when the carburetor does not open properly to allow air to enter. Underhood Service explains that another issue that causes low idle is vacuum leaks. This type of leak occurs when the vacuum line is not securely attached or there are bends in the line.
Additionally, dirty fuel injectors can cause vehicles to idle low. The fuel injectors are normally set to equal specifications; however, there are factors that directly affect the injectors. About.com notes that, when the fuel injectors test at different levels, they are malfunctioning and require cleaning or replacing. The site recommends repairing low idle symptoms immediately before the issues cause irreparable damage.Learn more about Car Parts & Maintenance
The idle sensor is also called an idle control valve or an idle air control. It is normally found on the throttle body of the engine on a vehicle.Full Answer >
Idle speeds vary from car to car, but for a passenger car, typical idle speeds are between 500 and 900 rpm. This idle speed also depends on the accessories that are currently running as a car's idle control system will automatically raise the idle in order to provide power for auxiliaries such as air conditioning and power steering.Full Answer >
The main causes of wobbly steering when driving at low speeds are problems with suspension systems, unbalanced wheels, damaged wheels or damaged tires. Some of the problems indicate a serious issue that should be addressed immediately.Full Answer >
A car or car's engine may vibrate while idling for various reasons, including that the motor or transmission mounts have a problem. When a car is stopped at a red light or turned on in park, a noticeable vibration may occur that signals damaged or broken transmission mounts.Full Answer >