Does O2 sensors make the truck backfire
3 Answers
I would not think so but if it is running too rich I suppose that could be the problem. Backfires can be from an exhaust leak or the timing being way off.
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Timing off is much more likely. Never seen O2 sensors cause backfiring.
Timing set is tricky on Vortec GOT to have a good Mach. ( Mack gen. 2 ) to get it right but when you do very good engine.