its gotta be something related to air...
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so you went from a 1.5 to a 1.6 block, added compression with the head swap, and didnt add any fuel.
YUP, she leaned out hard core.... probably under-fueled by 20% at sea level.
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The moment the O2 sensor stops responding to the ECU, it will generate a CEL.
Is he looking under the carpet for his codes ? Or waiting for the CEL to give it to him ?