Hello everyone,
I own a 2008 Mini Cooper R56 with the N12 naturally aspirated gasoline engine (120 hp, non-turbo) and a mileage of 150,000 km. Ever since I bought the car, I’ve been experiencing an issue with the idle that still hasn’t been resolved.
When I first start the engine (cold start), the idle fluctuates significantly. The car starts shaking like it's about to stall. The idle drops too low, then it revs up by itself again. After the engine warms up, the problem continues in a different way — for example, while waiting at a red light, the idle suddenly drops to around 450–500 rpm and then climbs back up again.
About 2,000 km ago, I had a full engine and transmission rebuild, but the problem existed before the rebuild and still persists afterward.
Almost every sensor and component related to idle and air-fuel mixture has been either replaced or tested. Still, the problem hasn’t gone away. It’s becoming so frustrating that I’m genuinely starting to lose all enthusiasm for the car.
Has anyone experienced something similar? What could be the possible cause? I’d appreciate any help or suggestions. I'm honestly exhausted from chasing this issue.
1 comment(s)
CarlyMechanic
Check the throttle body for carbon buildup or dirt, as this can affect idle stability. Cleaning the throttle body might help resolve the issue. Let me know if this makes any difference or if you have any further questions.
CarlyMechanic
Check the throttle body for carbon buildup or dirt, as this can affect idle stability. Cleaning the throttle body might help resolve the issue. Let me know if this makes any difference or if you have any further questions.