Question about BMW 318
I would remove the air filter and mass airflow sensor and the air tube up to the throttle and the rubber boot that attaches to the throttle body. Check the tubing for cracks that may be letting in excess air that is not being measured. It might be helpful to clean the throttle valve and the mass airflow sensor with mass airflow sensor spray.
Other problems that can cause the symptom you describe are degradation of the crank position sensor or possibly the cam position sensor (cam position sensor error will be most noticeable at idle). If those are causing the problem, as it gets worse it will eventually set a code and light the check engine light.
Posted on Mar 12, 2011
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Posted on Jan 02, 2017
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