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Old 07-22-2011, 02:12 PM
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Gaz64 Gaz64 is offline
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Reading spark plugs will only give you an average indication of A/F ratio.

Lean at one end and rich at the other (or vice versa) may give a good reading.

You need a fast operating wide band O2 sensor gauge with data logging capability to pick accelerator pump accuracy (rich/lean), idle circuit/progression/main circuit overlaps etc.
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