Is it normal for the car's idle speed to drop from 800 rpm to 600 rpm?
1 Answers
If the car's idle speed used to be 800 rpm and has now dropped to 600 rpm, this situation is not normal. Common causes for this phenomenon include a dirty or clogged intake system, engine misfire or poor working conditions, and a clogged three-way catalytic converter in the exhaust system. Dirty or clogged intake system: During vehicle use, components such as the throttle body, air filter, and idle air control valve can easily accumulate dirt and become clogged. Once clogged, the engine's idle speed will become lower and unstable, making it harder to start and more prone to stalling. The solution is to inspect the intake system for clogs every one and a half to two years and clean it promptly if necessary. Engine misfire or poor working conditions: Check the aging level of the ignition coils and spark plugs, inspect whether the fuel injectors are clogged or damaged, and check if the control unit wiring is damaged. Faults in the ignition system can lead to sluggish acceleration and engine shaking at idle. The solution is to inspect and repair the ignition system, replacing components if needed. Clogged three-way catalytic converter: When the engine operates under poor conditions for an extended period, it can cause the three-way catalytic converter to clog. Symptoms include low idle speed and a muffled engine sound. The solution is to replace or clean the three-way catalytic converter.
