Question about 2000 GMC Sierra

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Whirring noise 2000 Gmc sierra slt z71 with 170,000

I have a 2000 Gmc sierra slt z71 with 170,000 miles on a 5.3 v8 It has recently started making a whirring noise from the engine bay while driving...Once im up to speed i cant hear the noise over my flowmasters but once i start braking it is noticeably louder than the engine I have had my alternator checked and they said it was fine, then today the service engine soon light came on. Truck seems to run fine...whats wrong???

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  • owentabor1 Apr 30, 2010

    Cool Im getting up in the a.m. and starting the troubleshooting Ill keep you posted.. Thanks for the fast response!

  • owentabor1 Apr 30, 2010

    I wasnt sure if you got my email....Ill be gettinbg up and working on troubleshooting and ill definetely try what you said. I will keep you posted .....Thanks for the fast response!!

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Common problems with Gm's would be the alternator. I would look at the serpentine belt and verify its condition. Make sure that you can read the writing on the belt like holding a book in your hand. If it is upside down, flip it over. A little trick I learned working on Mercedes and it works. If this does not take care of the issue, remove the belt and start the engine. Chances are, this is coming from the alternator or serpentine belt tensioner. One way to tell if the tensioner is faulty, look at the way it sits against the belt. If it is ****-eyed, the tensioner is coming apart from the inside and can not be repaired. It must be replaced. Let me know what you find and we can procede from there.

Posted on Apr 30, 2010

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