What are the reasons for the starter's weak operation?
2 Answers
The reasons for the starter's weak operation: 1. The electromagnetic switch coil is short-circuited or has poor contact, generating insufficient magnetic force to further compress the return spring, resulting in poor contact of the main circuit contact disc; 2. During startup, the starter's pinion gear may be pressed against the flywheel end face and unable to engage. In such cases, turning the engine crankshaft slightly often allows the pinion gear to engage with the flywheel teeth, showing normal operation. If the pinion gear still fails to engage, it indicates that the return spring is too stiff. The starter's function is to convert electrical energy into kinetic energy when the key is turned to the start position, thereby starting the engine. When starting the engine, turning the ignition switch to the start position activates the starter relay coil circuit, which drives the engine's crankshaft to rotate, bringing the engine's pistons to the ignition position.
When it comes to the reasons for a weak starter motor, I think there are several common points. First, it could be due to low battery voltage, especially in cold weather when the battery capacity drops quickly, causing the starter to turn slowly or weakly. Additionally, worn brushes or burnt carbon brushes in the starter itself can affect performance, as poor current transmission naturally results in weak power. Wiring issues are also common—loose or corroded connections increase resistance, weakening the current. Moreover, when the engine resistance is high, such as due to thick engine oil or a damaged flywheel ring gear, the starter has to work harder, appearing weak. I’ve dealt with similar situations myself and recommend first using a multimeter to check the battery voltage—ideally, it should be above 12.6V. Also, inspect whether the starter connections are clean and tight. If repairs don’t solve the issue, it’s best to have a professional shop check if the starter needs replacement. Regular battery maintenance and cleaning connection points can prevent problems—otherwise, a roadside breakdown could be a real hassle.
