Review on Upstream Downstream 234 4012 1996 1998 Chevrolet by Jon Conner

Name: Upstream Downstream 234 4012 1996 1998 Chevrolet
Item: Upstream Downstream 234 4012 1996 1998 Chevrolet
Rating: 5

September 11, 2022

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.

Pros

Best in his niche

Cons

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