wierd gas mileage problem - 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 12-11-2008, 12:58 AM   #11
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how do you check for vac leaks and i will check all the wires and spark when i get up in the mornin. thanks for the input.
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Old 12-11-2008, 01:00 AM   #12
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ok first off how do i check for vac leaks, and i will check the spark and wires in the morning when i get up. thanks for the input
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Old 12-11-2008, 01:12 AM   #13
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well you can listen for hissing while the engine is running or spray fuel injector cleaner, like carb cleaner but for fuel injected cars, around the hoses and listen to the rpm, if they pick up you found a leak. I would venture to guess its just running too rich.
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Old 12-11-2008, 01:13 AM   #14
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If you take a can of carb cleaner and spray it on the vac lines and connections when the engine is running the RPM will go up if you spray a leak. Also get the EGR tube.
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Old 12-11-2008, 01:14 AM   #15
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Quote:
Originally Posted by SuperchargerHeaven View Post
well you can listen for hissing while the engine is running or spray fuel injector cleaner, like carb cleaner but for fuel injected cars, around the hoses and listen to the rpm, if they pick up you found a leak. I would venture to guess its just running too rich.

That'* a good chance if the O2 sensor is real bad. That'* why pulling the plugs and inspecting them is a good idea.
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Old 12-11-2008, 01:17 AM   #16
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This is what a rich mixture will look like.

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