Started tearing into the motor today! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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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 10-19-2007, 05:02 PM   #11
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Hmmm. I just happened to be reading the 1999 FSM about that very thing. To quote page FSM 6-832: "The upper and lower injector O-rings use different part numbers. To identify the correct O-ring, the upper O-ring is black and the lower O-ring is brown. Both O-rings are the same size but consist of different material."

I have no experience with them and maybe in practice it makes no difference, but I thought it was worth mentioning.
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