C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

idler pulley bouncing

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Old Oct 14, 2002 | 02:05 PM
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From: chandler az
Default idler pulley bouncing

I was under my hood the other day with the car running and I noticed the idler pulley was bouncing a lot. I used my long screwdriver to listen to all the components and the only thing making a lot of noise is the air pump. Do I need to replace the pump or the Idler assembly?
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Old Oct 14, 2002 | 02:38 PM
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From: Clever, MO aka SOMO
Default Re: idler pulley bouncing (brookman)

The idler pulley should not be bouncing at all. All is does it provide tension on the serpentine drive belt. I'd say the tensioner spring is shot. Replace the whole thing. About $90 for the part, including the pulley itself. Very easy to do. I think the air pump does make alittle air movement noise, but not much. It may be faulty too. Don't the price on that, tho.
Good luck, :seeya
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Old Oct 14, 2002 | 03:52 PM
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Default Re: idler pulley bouncing (brookman)

Sounds like your idler pulley is shot. If the spring is in good shape there would be no movement at all.
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Old Oct 15, 2002 | 01:21 PM
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From: chandler az
Default Re: idler pulley bouncing (brookman)

My hunch was right, the air pump locked up this morning on the way to work. With a new air pump the idler pulley doesn't bounce any more.

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