Okay so to begin, just recently had my 1992 Chevy Suburban K2500 5.7l TBI 4x4 in the shop to get inspected. The burban failed emissions bcus of too high count of hydro carbons. The limit for HC's is 537 and the trucks value was 604. I just barely passed the nox test with the limit being 7380 and my trucks value 6931. Not quite sure where to begin to get my HC's to go down. While it was in the shop they tried connecting to my obd computer and got NO communication. Ive tried searching with the search option for how to read blink codes by jumping pins where the connector is plugged in but had no luck. was told by a buddy that it was the bottom row far left two pins that would need to be jumped to get a code. tried doing this with the KOEO but got no blinks. Any suggestions or advice in helping me figure out these problems is greatly appreciated. Im a college student and need my truck to get to school and work to survive. Once again ALL advice is GREATLY appreciated. Love having a community i can go to for advice when working/running into problems with my truck. Thanks guys. annnd girls..