14 Diagnose Underhood Engine Noises
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While our story didn't turn out to have such a happy ending, remember, your engine noise can easily be external, possibly even a bad pulley or belt. Our friend's supercharged Mustang had a loud squealing noise under hood and once he went through the same diagnostic steps found an idler pulley bearing for the supercharger belt had failed. Just look at what's left of that bearing! View Related Article
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