Was out logging AFR % error tonight, pulsing around the 3k rpm range trying to fill cells, and threw a P1514. I have heard of this happening on big h/c stroker engines and also with FI builds, but never on a nearly stock setup.
Are there any other causes of this error besides flowing so much you max out the stock expected airflow vs throttle position tables? Anything I can look for or test?
2000 C5 with LTs and catback, and the lid is off the air filter ("zip tie mod").
Thanks,
Jack


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