Bad HWY gas mileage - Page 2 - 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 01-31-2005, 02:03 AM   #11
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Check your plugs to see if they are fouled at all. With the hard starting I would suspect a bad FPR.
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Old 01-31-2005, 02:22 AM   #12
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I am one heatrange colder with Autolite 605'*. They are gapped slightly higher than .55, but I do not think they would be the culprit.
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Old 01-31-2005, 03:36 PM   #13
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Smellbird, with a bad FPR, would I not take a performance hit? But monitoring my RPMs, around 60 mph, they seem to be right around 2000, so I would assume that I am entering overdrive.
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Old 01-31-2005, 08:56 PM   #14
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I agree with the o2 sensor diagnosis...
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Old 02-01-2005, 12:21 AM   #15
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What things should I scan for with autotap? And will going to Autozone do any good? Or do I need someone with an Autotap for GM enhanced parameters?
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