Mini Cooper Diesel Engine Issue

I'm experiencing a rather concerning issue with my 2011 Mini Cooper Diesel. It has almost 99000 km on the clock. Lately, I've noticed a significant reduction in engine power, rough engine running, and a pronounced jerking sensation when accelerating. Additionally, there's a loud hissing sound accompanying acceleration, and my fuel consumption seems to have increased. The engine light is also on. My suspicion is that this might be related to the intake manifold flap control. Does anyone have experience with this?

4 comment(s)

Reduced power and hissing sounds often point to air intake issues. Have you checked the air intake hose for any cracks or leaks? Also, when did you last replace your air filter?

I visually inspected the air intake hose, and I couldn't find any obvious cracks. How can I definitively test the air intake system without specialized equipment?

Given the symptoms and mileage, a defective intake manifold control switch is a likely culprit. The hissing sound suggests a vacuum leak related to the air intake system, which this switch controls. I would recommend taking it to a workshop for diagnosis and repair.

Thank you for your insight. I took the car to a reliable workshop, and it turned out to be exactly what you suspected: the switch for the intake manifold control was defective. The repair, including parts and labor, came to 465€. Now the engine runs smoothly again, and the engine light is off.

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