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Making a grunt sound

1K views 2 replies 2 participants last post by  Oneboat 
#1 ·
I work at an auto repair shop and we had a 2010 turbo john cooper works mini come in... When the customer does a hard take off there is a grunt sound under the hood. I can't really tell where the sound is coming from... The mini drives fine no noise at all when driving normal. But when you power brake it or dump the clutch it makes the grunt sound... Ant help work be nice
 
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