Hello everyone, I am trying to get an inherited 1988 Silverado 2500 up and running. It is failing the smog test for HC @ 15mph. Measuring 125 where max is 100. Passes the HC @ 25 mph. It also failed the Fuel Evaporative Control Function check. There are no error codes. Being a ODB 1, I have purchased the ALDL scan cable from Red Devil River as suggested on the board. My question is, once I have it plugged in and running, what should I be looking for in the TunerRT dashboard to tell me what I need to replace? If the oxygen sensor was bad, or the CAT needs replacement, what should I be looking for?
Thank you for any input!
Thank you for any input!