Is it normal for the idle speed to drop from 800 to 600 rpm?
1 Answers
If the car's idle speed was previously 800 rpm and has now dropped to 600 rpm, this situation is abnormal. Common causes for this phenomenon include dirty or clogged intake systems, engine misfiring or poor working conditions, and clogged three-way catalytic converters 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 clogging occurs, the engine's idle speed will become lower and unstable, making it difficult to start and prone to stalling. The solution is to inspect the intake system for dirt or clogging every year and a half or two years, and clean it promptly if necessary. Engine misfiring or poor working conditions: Check the aging level of ignition coils and spark plugs, inspect whether the fuel injectors are clogged or damaged, and check for any damage to the control unit wiring. Faults in the ignition system can lead to poor acceleration and engine shaking at idle. The solution is to inspect and repair the ignition system, replacing components as needed. Clogged three-way catalytic converter: When the engine operates under poor conditions for extended periods, it can cause the three-way catalytic converter to become clogged. Symptoms include low idle speed and a muffled engine sound. The solution is to replace the three-way catalytic converter or clean it.
