Acceleration Rattle (Update, not fixed, but different) - Page 2 - 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 03-12-2004, 02:36 AM   #11
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I can't imagine your timing chain doing it.....but it is getting old. I'd be more prone to suspect the rear bearing on your alt or one of the idlers. Tough one.
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Old 03-12-2004, 03:00 AM   #12
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Further thought........

For a rattle, it can be a harmonic......but assuming it is or isn't, it has to be a NON-lubricated thing. So rule out the timing chain/valvetrain.

Assume it isn't a vibration harmonic. From that side of the engine, it has to be the crank pulley, the tensioners, the rear bearing of the alt, the water pump, or the AC compressor. Try it with the AC in auto or normal. I'm curious about this. VERY curious. I like the difficult ones

(did I leave out any sealed bearings?)
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Old 03-12-2004, 03:15 AM   #13
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I believe I've heard it make the same rattle with the AC kicked in. The SC tensioner pulley isn't suspect, it'* been replaced with ZZP'* with no rattle change. The tensioner itself, maybe. I think I replaced the alt with a reman after the rattle showed up.
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Old 03-12-2004, 03:31 AM   #14
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Remove both tensioner idlers. Oil them with engine oil (let them soak on each side for 30 minutes). Put them back in opposite locations, turned around from the way they were (outside face in on both of them). See what that does.
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Old 03-12-2004, 03:43 AM   #15
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You mean the pulleys, or the entire tensioners?
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Old 03-12-2004, 03:48 AM   #16
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Just the pulleys. Tensioner assemblies aren't interchangeable anyway. If one of them isn't true, it'll wear the pulley bearings. If you swap it, that wear will be switched to the other side. And no noise for awhile.
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Old 03-12-2004, 03:51 AM   #17
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I'll give that a try.
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