Review on Upstream Downstream 234 4012 1996 1998 Chevrolet by Jon Conner
Learned something new
Ls 5.3l 99 Silverado 1500 3dr 4x4 Z71 Like an idiot he poured injector cleaner into the tank and cleaned it. Check Eng light, killed both O2 sensors on bank 2 almost instantly. Tremendous fuel economy, 23 is better for me on this block. Never thought clean O2 sensors could make such a big difference in performance. I'll be back in 10,000 miles.
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