Question about BMW 3 Series
Sounds very much like the air mass sensor is not right. This is found on a collar on the air ducting immediately after the air filter box. It ahas an electrical connection running to it. Whilst the engine is warm at running at idle (surge and slow) disconnect the electrical plug. Do not worry this will in no way harm the engine. The engine should soon resume a steady rate. It might be higher or lower than normal but it will be steady. If this happens then it is a certainty that the air mass sensor is at fault and should be replaced.
Posted on Aug 29, 2010
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Posted on Jan 02, 2017
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