What are the reasons for the fluctuating idle speed of a warmed-up BMW X6?
2 Answers
The reasons for the fluctuating idle speed of a warmed-up BMW X6 are: 1. Intake manifold leakage; 2. Increased carbon deposits on the throttle body; 3. Faulty intake system actuators; 4. Fuel system malfunction; 5. Ignition system failure. Solutions for the fluctuating idle speed of a warmed-up BMW X6: 1. Clean the engine and idle control valve of carbon deposits; 2. Replace the spark plugs; 3. Replace aging engine components. Taking the 2021 BMW X6 as an example, it belongs to the mid-to-large SUV category, with body dimensions of: length 4947mm, width 2004mm, height 1698mm, wheelbase 2975mm, and fuel tank capacity of 83 liters.
My X6 also experienced unstable idling last year, with the tachometer dancing after the engine warmed up. The most common cause is carbon buildup in the throttle body—BMW engines tend to get dirty, and sticky deposits can obstruct the throttle plate, disrupting airflow. Also, check the intake pressure sensor; if its readings are off, the ECU will mismanage the air-fuel mixture. A cracked diaphragm in the EVAP valve can cause vacuum leaks—listen for hissing sounds. Clogged fuel injectors may spray unevenly; try adding two bottles of OEM fuel system cleaner. Worn spark plugs with excessive gaps weaken ignition and are another culprit—replace the full set at 80,000 km. For a reliable diagnosis, visit a specialist to scan for trouble codes. Avoid DIY disassembly, as damaging seals could lead to bigger issues.
