rainerkoenig42
Mini Cooper Engine Problem Resolved
Summary of the thread
A 2020 Mini Cooper was experiencing a check engine light, loud hissing noise during acceleration, and poor fuel economy, suggesting an air intake issue. The problem was identified as a vacuum leak, specifically a cracked vacuum hose connected to the intake manifold near the throttle body. Replacing the hose resolved the issues, eliminating the hissing noise and restoring normal fuel consumption.
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4 comment(s)
rainerkoenig42 (community.author)
Thanks, that's helpful. Which specific vacuum hose did you have issues with? There seem to be a few connected to the intake manifold on my Mini Cooper. Any pointers on where to look first?
charlesflamme99
In my case, it was the vacuum hose connected directly to the intake manifold, near the throttle body. It had a hairline crack that was difficult to spot initially. If you're not comfortable diagnosing it yourself, a workshop should easily identify it with a smoke test.
rainerkoenig42 (community.author)
Big thanks for the detailed info. Turns out it was indeed a cracked vacuum hose. Replaced it myself, got the part for around 100€. Check engine light is off, and the hissing is gone. Fuel consumption seems normal again. Appreciate the help!
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MINI
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COOPER
charlesflamme99
I experienced similar symptoms with my Mini Cooper. A loud hissing sound during acceleration, coupled with the check engine light, suggests a vacuum leak. High fuel consumption further points to this issue. Please inspect the vacuum hose that connects to the intake manifold and throttle body. A crack or loose connection there is a likely culprit.