fuel milage - 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 08-22-2007, 11:54 PM   #11
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Where did you put the seafoam? In the tank?

If you sucked it in a vacuum line, you need to change your spark plugs. If you put it in the fuel tank, don't worry about it, but there are better injector cleaners out there.

Keep us updated.
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Old 08-23-2007, 12:26 AM   #12
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through a vaccuum line, but i pulled a plug afterwards and it looked ok, i just replaced them not to long ago with delco platniums...i can get them through work cheap enough so i guess it wouldn't hurt to do them again
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Old 08-23-2007, 08:33 AM   #13
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I seafoamed once and didn't find any need after pulling a couple plugs to change them. I think that'* in extreme cases where dirt etc fouls them.
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Old 08-25-2007, 05:26 AM   #14
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what is sea foam???
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Old 08-25-2007, 06:01 AM   #15
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Old 08-27-2007, 12:26 AM   #16
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I've been through one tank and have noticed a slight improvement...between 23 and 24 mpg vs 19 or 20, but i didn't do my typical driving either, being near the end of the week/ begining of the weekend,, half my driving was around town on the weekend and i was stuck in traffic a few times. I will have better results by around wed. when i burn through this next tank.
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