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engine idle loud noise

  1. Volvo 700, 800 and 900 series
    I've recently discovered when my car runs a few minutes before leaving my work. It hums(Idles) like a diesel engine. I checked my oil which is good. Belts are all good. I just can't figure it out. BTW It takes Regular Unleaded, not a diesel engine. Here's a video of what it sounds like...