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Code 43 OBD-1 1993 S-10 4.3 V6

Old July 13th, 2019, 9:52 PM
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Default Code 43 OBD-1 1993 S-10 4.3 V6

This is a recurring issue on a 4.3 V6 that I'm working with. I've rebuilt the TBI, new fuel filter, knock sensor, Idle air control & TPS, re-manufactured ECM, Full Tune-up with module & everything but a new distributor. Timing is set correctly, The engine runs smooth, drives great but the check engine light comes and goes intermittently. I've heard that full size Chevy trucks with 4.3 have the same problem. Any info or advice will be Greatly Appreciated!
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Old July 14th, 2019, 7:50 AM
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Recheck your ground circuit.
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Old July 14th, 2019, 8:00 AM
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Good idea! Thank You!
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