Originally Posted by vader1,Oct 20 2010, 07:19 AM

Maybe, but I took my car to a tuner and he installed the sniffer in the tailpipe and it read a "lean" spot that did not exist when reading from my PLX wideband. He tried to richen up the mixture and put the injectors as far as they would go between about 2500-5000 rpm and his sniffer still read lean while my plx gauge said he totally screwed up the AFR. He told me he could not fix this mystery lean spot but made it as rich as he could. When I left the car bogged, popped and mini backfired at just slow under the radar speeds. It was almost undrivable. And this guy was highly recommended around town.

I don't know if it was his fault but his equipment was way off. I flashed back to the base tune for my kit on the way home and it ran perfect and have been using basically that tune without issue for 6,000 miles trouble free.

My "cheap" wideband installed in the header was far more accurate than his expensive sniffer at the tailpipe. Not saying thats going to be true in all cases but expensive ones can break too.