Poor Fuel Economy, Need Help Badly!! - 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 11-19-2007, 12:35 PM   #11
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And there is only one oxygen sensor right? Theres no post cat O2 sensor like those in my Camaro?
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Old 11-19-2007, 12:40 PM   #12
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In 97....you should have one after as well.
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Old 11-19-2007, 12:46 PM   #13
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Quote:
Originally Posted by BillBoost37
In 97....you should have one after as well.

.....which you don't care about right now. It has no effect on performance and mileage, it'* only purpose is to keep an 'eye' on the efficiency of the catalytic converter.
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Old 11-19-2007, 02:40 PM   #14
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Are there any other parameters of the engine that I should look out for? I do know that it takes a second for it to fire upon cranking it. I have started many an L36 and they fire right when the key is turned. Could something have not been built right? The engine runs fantastic, but it just gets such bad mileage.
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Old 11-19-2007, 02:43 PM   #15
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You might want to check the FPR vacuum line for fuel in it. The fuel pressure could also be a problem. You'd also want to consider the plugs and wires.

Take a look at the long term fuel trim. See where it'* hovering.
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Old 11-19-2007, 03:30 PM   #16
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Long term fuel trim? Is that a parameter on the scan tool?
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Old 11-19-2007, 03:46 PM   #17
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Yes, you need a scan tool to read the fuel trim
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Old 11-19-2007, 03:54 PM   #18
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Where should it be hovering?
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Old 11-19-2007, 05:04 PM   #19
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Ideal would be 0.. it'* safe to say it'* not at 0 though. If it'* more than 7 thats a possible indicator of a fueling problem.
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Old 11-19-2007, 06:44 PM   #20
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Tuffguy - Was the Case Learn procedure done?
If not would this affect the gas mileage?
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