If your truck is running TOO lean, your truck will set lean codes and turn on the check engine light. The PCM is able to correct up to about 40-50% plus or minus (short term and long term combined) on the injector pulse width to correct for lean and rich conditions. Once the PCM begins to correct more than 15%-18%, you will get a check engine light.
If you want to see how much your air/fuel ratio is being corrected, you'll have to look at the long-term and short-term fuel trim correction data. If the LT fuel trim is within 10% (and ST is stabilized at 0-2%), then there's nothing to worry about.
Basic answer, if your check engine light isn't on and you're not experiencing surging, hesitation, detonation, etc., your A/F ratio is 14.64:1
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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