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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-19-2006, 11:56 PM   #1
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Default Odd Noise

I changed the T-stat today. Then I started the car up to bleed the system. as soon as i did, i heard this horrible high pitched rattling noise. i couldn't locate it. as soon as i raised the RPM it either went away or raised pitch(im deaf as a doornail). i though it might be the */C coupler or the */C oil or a combo of the two. any ideas?
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Old 07-19-2006, 11:58 PM   #2
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Harmonic Balancer? I know those can rattle like crazy...never actually heard one that was failing though. Check to see if it is coming apart...
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Old 07-20-2006, 12:45 AM   #3
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This is what a fubar'd harmonic balancer sounds like. Similar?

http://members.shaw.ca/bonneville01/MVI_0003.avi
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Old 07-20-2006, 02:54 AM   #4
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I think so, ill check in the morning
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Old 07-20-2006, 09:07 PM   #5
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well today i took off the pulleys and unbolted the sc snout, my coupler is bad it'* horribly loose, and i found one of my tensioner pulleys are starting to go bad. so i guess i'll be going to zzp for some parts. maybe ill just happen to order a 3.4 pulley too!
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