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2005 GMC Envoy Question: 4.2l noisey front of engine

 

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envoy1, Noyes, MN, January 19, 2014, 08:53
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replaced serpentine belt and idlers

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  • Answer #1

    G. T. Service Center (3051 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG January 19, 2014, 09:03
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    I had the same problem; On some of the year models, the belt has been longer for some reason. I have replaced the belt several times, and the pulleys, and still would get noisy shortly after changing parts. The tensioner did not maintain enough tension, because the belt was longer than necessary. Researched belt length, and it needed to be about a 1/2" shorter for the tensioner to work properly. Looked up a belt for an earlier model envoy and it showed a shorter belt for that one, with the same engine. So I got the shorter belt and put it on in place of the one it called for, and tighter tension pressure and no more noise. It has been 6 months and the car is still doing good. No more comebacks.

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  • Answer #2

    pushrod January 19, 2014, 09:42
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    Describe the noise. Roaring/grinding or squealing/chirping? Remove belt and start engine, noise gone?

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    envoy1, January 20, 2014, 11:29
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    roaring quiet when belt is off and start engine

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    ProfessorG, January 20, 2014, 13:44
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    Put the shorter belt on it.

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    pushrod, January 20, 2014, 14:09
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    Spin ALL driven componets by hand to see if a bearing is making this 'roaring' noise!

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    envoy1, January 20, 2014, 14:15
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    no rough or noisey bearings

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    ProfessorG, January 20, 2014, 14:26
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    You have fun until you get it figured out, Have fun.

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