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What are the causes and solutions for unstable idle speed?

1 Answers

McAdalynn

07/28/25 11:22pm

Here are the main solutions for unstable idle speed in cars: 1. Clean carbon deposits from the engine and idle speed control valve. 2. Clean the fuel system. 3. Replace spark plugs, high-voltage wires, and ignition coils. 4. Clean the air filter and throttle body. 5. Replace aging engine components. Here are the main causes of unstable idle speed: 1. Carbon deposit issues: Severe engine carbon buildup causing blockages. Dirty throttle body or carbon deposits in fuel injectors leading to clogging. 2. Spark plug failure: Malfunctioning spark plugs, high-voltage wires, or ignition coils resulting in poor ignition system performance. 3. Unstable fuel pressure: Insufficient fuel pump pressure or incorrect readings from the intake pressure sensor. 4. Fuel system blockage: Blocked fuel lines causing insufficient fuel supply, leading to unstable idle speed. 5. Component aging: Aging engine parts causing unstable idle speed.

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