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.

Upper Intake and Yellow vs. Dex

Old Aug 12, 2004 | 06:39 AM
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Ok, but when was the plenum made? Because although it has been noted that the 99 plenums have not been known to fail, 98s have (even a Delphi.) A 99 Bonne could have a 98 plenum.

You can check the 3 clock stamps molded into the top of the plenum to give you that date.
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Old Aug 12, 2004 | 07:34 AM
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Originally Posted by BluBonne
Ok, but when was the plenum made? Because although it has been noted that the 99 plenums have not been known to fail, 98s have (even a Delphi.) A 99 Bonne could have a 98 plenum.

You can check the 3 clock stamps molded into the top of the plenum to give you that date.
1999 model year vehicles UIMs' are NOT exempt from failing.
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