Question about 2000 Lexus Gs 400

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I have a 2000 lexus gs400 it has a little over 180,000 miles on it. Just recently when I crank the car it is making a humming sound when the car is drivig as well as sitting still. I am almost 100% s

Little over 180,000 miles. My car is making a humming sound while driving and in idle.

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  • 193 Answers

Does it change pitch when the steering wheel is turned?

Posted on Dec 06, 2012

  • 2 more comments 
  • John Wilson Dec 06, 2012

    No I checked all the things like that you know power steering low oil, but all of that is ok. When I rev the engine the sound gets louder.

  • Jeremy Nottingham
    Jeremy Nottingham Dec 06, 2012

    Has to almost be belt driven. ie water pump,power steering pump. I have seen in some cases were an idler pully might make noises

  • John Wilson Dec 06, 2012

    I thought about that as well I was wondering how would I go about eliminating them to find which one it could be? Also I appreciate ur help on this

  • Jeremy Nottingham
    Jeremy Nottingham Dec 06, 2012

    Well, I have a stethoscope with a probe on the end that can touch to find noises like that. Also a piece of garden hose can work as well. Other than that, remove serpentine belt and feel each pully to find a rough turning one

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