engine codes - GM Forum - Buick, Cadillac, 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.

engine codes

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Old 10-10-2002, 09:10 PM
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Does anybody know what code 640 QDM means? I have a soft code of 640 and was told it has somethin to do with a Quadra something.
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Old 10-10-2002, 09:40 PM
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What year is you car?
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