Idler pulley failed....why? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-02-2007, 05:02 AM   #1
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Default Idler pulley failed....why?

It seems as if the L67'* have a problem with this. I actually test drove an SSEi with the exact same problem about a year ago..... I thought it was odd how I was getting 19* of timing but not going anywhere fast......I guess it was finally time to bite the dust like many others out there.....





I guess its time to buy a new idler pulley and a new belt....sucks because the belt that was on there was only 3 weeks old. There was no sign of the failure, actually I was showing a friend the FWI just yesterday and no signs of failure.


Any ideas how to get the burnt rubber off my sc pulley?
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Old 10-02-2007, 08:18 AM   #2
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How many miles on that pulley?

I replaced all my pullies before heading to WCBF06 (remember how one was bad in your driveway? ) Things happen.. bearings can go. I'd check them all and once a month or more, listen to them for any signs of problems.
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Old 10-02-2007, 02:43 PM   #3
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A good way to check em is with a mechanics stethescope.... put it in your ears, put the probe on the bolts of each pully and listen for anything thats not a smooth bearing sound... I just replaced all my tensioner and idler pulleys, along with both belts. All I could hear was a lil belt squeek that went away with some silicone spray, but listening to each pulley with the stethescope told me a dif story. A cheap mans stethescope is as easy as using a screwdriver/ or pry bar and putting the handle to your ear, not a good as one you could buy, but you can hear if you have bearing "growl".
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Old 10-03-2007, 06:46 AM   #4
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I had the pulley to the left go shortly after Bill and I installed my MPS. I think the smaller belt puts more initial strain on the system. It ate a belt that was less than a week old when mine failed. Good news is since I replaced the bearings it'* been fine...{knocks wood}
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Old 10-03-2007, 02:26 PM   #5
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I'd be surprised if you didn't hear any whining at idle with a bad pulley. I know one of mine is bad now, I can tell by the sound while idling. I had the same noise on my 94.
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Old 10-03-2007, 09:17 PM   #6
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I had that go on my 98. I tend to play music loud so I never heard it, but rather started to feel the supercharger hesitate a few days before it bricked.
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Old 10-04-2007, 01:42 PM   #7
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I had a funny one on my wife'* Mountaineer. It had been squeeling for over a year, but only on wet days. I wasn't sure what it was, but thought it might be a pulley. Even in snow it wasn't bad, just rain. But it got to be audible all the time over the last few months during the winter. I finally investigated, and found it was the idler pulley (I could pry a screwdriver against it, and it would stop squeeling) and replaced it. Man that quiet was music to my ears when it was gone.
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