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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 08-18-2007, 10:48 AM   #21
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We need to fix the octane issue first, then look at the boost. The PCM may be pulling boost to protect the engine from the knock.

Put 91-93 (higher the better) in the car when it'* close to empty. Drive for about 20 miles, then go home and change your spark plugs. Start your diagnosis from that point. Use COPPER plugs. NGK TR55 is a good choice, and gap them at .060" since you have a stock SC pulley.

THEN verify your symptoms. Both seat of the pants as well as gauge info.
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