Q: Buzzing noise at 3,000 RPM on a 1991 Nissan Sentra

asked by on April 13, 2016

My 1991 Nissan Sentra makes a buzzing-sound noise at about 3,000 RPM. It's been annoying since that's a constant RPM on a highway. I'm suspecting some loosened exhaust or some loose heat shield.

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