Stalled at high speeds - 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 12-18-2011, 11:27 AM   #11
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I haven't changed the oil since the Seafoam, but it'* still very clean. The directions on the can say change it once it'* dirty. I followed directions pretty closely - I put about 1/3-1/2 in the vaccuum lines, 1/3-/12 in the crankcase, and then the rest of that can and another can in the fuel tank (1 oz/gallon is directed - 18 gallon tank).

I probably won't get to it until after the holidays at this point, just looking for suggestions so I can hit the ground running.
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Old 12-19-2011, 10:05 AM   #12
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Sea Foam in the top end can cause crappage (technical term) to coat your O2 sensors, and even to possibly clog the cat. Pull the upstream O2 sensor and do a visual inspection.
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Old 12-19-2011, 11:09 AM   #13
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I've done quite a bit on this car, but nothing with oxygen sensors. Where are they located and what is required to get to them?
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Old 12-19-2011, 11:20 AM   #14
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On the exhaust pipe, upstream from the cat. From up top, look behind the engine in the area just below the rear center spark plug.
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