What causes the BMW X6's idle speed to fluctuate and become unstable?

1 Answers
DeJames
07/29/25 7:06pm
Possible causes include excessive carbon buildup in the throttle body, intake manifold leaks, or faults in the intake system components. Additionally, issues with the fuel system or ignition system can also lead to unstable idle speed in the BMW X6. If any of these faults are detected, it is crucial to promptly inspect and repair the relevant vehicle components. Below are detailed explanations: 1. Excessive carbon deposits in the throttle body reduce the cross-sectional area of the air passage, preventing the control unit from accurately regulating the idle air intake. This results in an overly rich or lean air-fuel mixture, causing unstable idle speed in the BMW X6. 2. Intake manifold leaks occur when air, combustion exhaust gases, or fuel vapors that should not enter the intake manifold do so, leading to an overly rich or lean mixture and unstable idle speed. 3. Faults in the intake system components, such as the throttle motor, mass airflow sensor, idle speed control motor, or intake pressure sensor, can also cause unstable idle speed.
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