What Causes a Car to Stall at Idle Speed?

[RebeccaAnn]

Here is a detailed analysis of the specific reasons for a car stalling at idle speed: 1. Rapid switch signal circuit issues: Due to improper adjustment of the idle contact gap, poor contact, damage, or circuit failure, the engine ECU cannot correctly determine the idle condition, leading to rapid control errors and various idle speed problems. 2. Fuel injector and its circuit issues: Problems with the fuel injector and its circuit affect the quantity and quality of fuel injection. For example, carbon buildup blocking the injector can reduce fuel injection and cause poor atomization, injector wear can lead to excessive fuel injection and leakage, and electrical faults in the injector solenoid coil or its control circuit can result in reduced fuel injection or no injection, causing poor idle operation and misfiring.