Hey Mark did Dynotech put a sniffer on your tail pipe to read the A/F ratio? Im sure they did which means its probably not all that accurate. If we can mount my wideband right on the collector of the y-pipe we should get a pretty accurate reading and we'll be able to see whats going on. The autotap will also read A/F ratio but it will be reading the A/F coming of the stock O2 sensors which isnt as accurate. Between the two we should be able to get an idea of whats wrong. I just have to find a working laptop so I can load of the software.
1997 GMC Sonoma 4.3 5 speed, 10psi Intercooled ATI Procharger, 3" Spintech exhaust, Went 13.6 at 105 mph.
| 
