What causes unstable idle speed in the Baojun 560?

[SanEmmett]

Intake manifold air leaks, excessive carbon buildup in the throttle body. Intake manifold air leaks: Unauthorized entry of air, gasoline vapor, or combustion exhaust into the intake manifold causes the air-fuel mixture to become too rich or too lean, resulting in unstable engine idle. Excessive carbon buildup in throttle body: When excessive carbon deposits accumulate on the throttle valve and surrounding intake passages, the cross-sectional area of the air channel changes. This prevents the control unit from precisely regulating idle air intake, leading to an overly rich or lean mixture and unstable idle speed. Idle air control component failure: Malfunctions in idle air control components cause inaccurate idle air regulation. Common causes include: damaged or stuck throttle motor; faulty or stuck idle stepper motor, duty cycle solenoid valve, or rotary solenoid valve.

[DelMaya]

With years of experience in auto repair, I've encountered numerous cases of unstable idling in Baojun 560 models. The most common culprit is spark plug issues – worn-out or carbon-fouled plugs cause erratic ignition, making RPMs fluctuate like a rollercoaster. Carbon buildup in the throttle body blocking air passages also disrupts combustion, while a dirty or faulty mass airflow sensor tricks the ECU into miscalculating fuel injection. Clogged fuel injectors are another offender, causing engine shuddering through uneven spray. A stuck idle control valve directly interferes with idle stability. My advice: start with basic maintenance – replace spark plugs and clean the throttle body plus air filter. If problems persist, use an OBD scanner to diagnose trouble codes and rule out ECU/sensor failures. Don't delay repairs – prolonged rough idling risks engine component damage, hitting both your wallet and safety hard.

[DiTalia]

I'm the owner of a Baojun 560 and recently dealt with an unstable idle issue. While driving, the RPM would fluctuate erratically when parked, like a heart attack. At the repair shop, they found severely worn spark plugs—replacing them stabilized the idle. A dirty air filter also affected airflow, and cleaning it made a noticeable difference. Carbon buildup on the throttle valve was another culprit; cleaning it made it feel like new. I later learned that a faulty idle control valve or a leaking fuel pressure pump could cause similar shaking. A simple solution is regular cleaning of sensors and injectors during maintenance. If you notice unstable idling, don’t ignore it—visit a professional shop promptly to avoid minor issues turning into costly repairs or safety hazards.

[VincentAnn]

From a technical perspective, the unstable idle speed of the Baojun 560 is often caused by several mechanical faults. Failed spark plugs lead to unstable ignition; carbon deposits accumulating in the throttle body restrict airflow; a contaminated or damaged air flow sensor misleads the ECU; and a faulty idle speed control motor fails to stabilize RPM fluctuations. Fuel system issues, such as clogged injectors or insufficient fuel pump pressure, can disrupt fuel delivery. Occasionally, ECU software bugs may also be the culprit. It is recommended that car owners check the spark plugs and clean the throttle body themselves, then use diagnostic tools to scan for trouble codes to pinpoint the root cause. Early repairs help protect the vehicle's overall lifespan.