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BMW 3 Series: Morning Misfires and Whistling Noise Issues

I own a 2008 BMW 3 Series with a gasoline engine and 120,000 km on the odometer. I've been experiencing several issues: the check engine light is on, the car shakes while idling, and there's poor fuel economy. Additionally, there's a whistling noise and a fuel smell, with misfires in cylinders 1 and 4. These problems only occur in the morning or when the car has been parked for hours and cooled down. I've already replaced the air flow sensor, so it must be something else. Could anyone provide insights or suggestions on what might be causing these problems?

The owner of a 2008 BMW 3 Series is experiencing morning misfires, a whistling noise, and poor fuel economy, with issues such as the check engine light being on and the car shaking while idling. These problems occur after the car has cooled down. A possible cause could be a vacuum leak, particularly around the intake manifold and hoses, which might also explain the whistling noise and fuel smell. Inspecting the hoses for cracks or disconnections is suggested as a potential solution.

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Check for any vacuum leaks, especially around the intake manifold and hoses. A vacuum leak can cause rough idling, misfires, and poor fuel economy. The whistling noise and fuel smell might also be related to this. Inspect the hoses for cracks or disconnections. Let me know if you find anything or if you have further questions!

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BMW

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