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 has dropped from 800 RPM to 600 RPM, this is not normal. Common causes for this phenomenon include a dirty or clogged intake system, engine misfiring or poor operating conditions, and a blocked catalytic converter in the exhaust system. Dirty or Clogged Intake System: During vehicle use, components such as the throttle body, air filter, and idle 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 if necessary. Engine Misfiring or Poor Operating Conditions: Check the aging condition of the ignition coils and spark plugs, inspect whether the fuel injectors are clogged or damaged, and ensure there are no damaged control unit wiring. Faults in the ignition system can lead to weak acceleration and engine shaking at idle. The solution is to inspect and repair the ignition system, replacing components if needed. Blocked Catalytic Converter: When the engine operates under poor conditions for an extended period, it can cause the catalytic converter to become blocked. Symptoms include low idle speed and a muffled engine sound. The solution is to replace or clean the catalytic converter.