Wierd exaust noise - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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 01-05-2004, 11:34 PM   #1
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Default Wierd exaust noise

OK, this may or may not be a big deal but heres how it is.... When ever i hit 2000 rpms my exuast goes from a quiet hum to a loud moan. Its only on the 2000 mark. it happens if i jsut go over it, or if i keep it at 2000 rpms it'll keep making the noise. What is this? Also, it seems like bonnie has been having problems switching gears as fast as she used too. Any relation to each other? Any easy fix i can do? I appreciate the help if you know anything. Thanks
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Old 01-05-2004, 11:35 PM   #2
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Also i forgot, its a 1997 aniversary edition
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Old 01-06-2004, 01:33 PM   #3
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WOW no help on this at all? Please I'm getting worried!
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Old 01-06-2004, 01:50 PM   #4
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Could be a heat shield rattling....
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Old 01-06-2004, 03:45 PM   #5
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how could i check that?
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Old 01-06-2004, 03:47 PM   #6
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You're going to have to get under your car, and shake/kick everything. If it'* a harmonic (vibrates at a certian frequency) it can be hard to find. Pay the most attention to your catalytic converter. When you shake or kick it, do you hear any noise? Anything rattling? Same with the muffler. These are the two devices in your exhaust where something can come loose inside and rattle.
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Old 01-06-2004, 05:06 PM   #7
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On my 93 I had a heat shield rattling just above the muffler (below the trunk). It was similar to your situation and would only rattle at certain RPMs (between 1500 and 2500). I got under there and looked and a bolt that screws into the bottom of the shield and into the frame and fallen out. I installed a new screw and no more rattles.
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Old 01-06-2004, 08:14 PM   #8
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great advice guys! ill try that tomorrow deffinatley!
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Old 01-08-2004, 11:24 PM   #9
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Default thanks guys you helped alot!

It was that my muffler was pushed up and it was hitting a metal pice on top and rattling against it on the 2000 mark. thanks! me and my dad pushed it down and it stopped!
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Old 01-08-2004, 11:42 PM   #10
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For the transmission shifting problem, have it professionally flushed.
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