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Check inside the engine compartment on the left shock tower. There should be an engine information label which if you can read (usually very small) should tell you the spark plug gap. My 2001 shows it to be 0.050 inch gap, which just set on 4 new plugs and is excellent.

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13y ago
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Q: What is the proper spark plug gapping on 2001 Oldsmobile alero?
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