Gradual loss of gas mileage over 8 mo - Page 3 - 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 02-11-2006, 11:18 AM   #21
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Excellent. You're on the right track. Don't buy Bosch Platinums or wires, either.

Never really figured it out, but we have EXTREMELY high failure rates with bosch O2'*, plugs, and wires.

Funny, since there are other bosch parts on our cars, but those parts installed at the factory are manufactured to GM specs.
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Old 02-11-2006, 01:58 PM   #22
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Don't be a gune, do the tune! After the urging here, It completely changed my car which somehow had thrived on neglect for 150,000 mi. Plugs, wires, PCV, O2, and fuel filter sparked a major recovery. A gutted airbox with drop in K&N was just gravy. Cleaning the TB and MAF screen is next.

You really can't tell where the car is until ya take care of the fundamentals.
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Old 02-12-2006, 01:01 PM   #23
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If your getting a rotten egg smell its probably the 02. I'm monitoring mine currently and I think the guys are dead right on Bosch.
Don't forget a standard tuneup includes Plugs, wires, PCV, fuel and Air filters, fuel injector cleaner, and cleaning of the throttle body and sensors.
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