My '84 Toyota pickup with 155K miles failed smog check today. I'm sure the numbers tell a story of what's likely to need attention. But I don't speak the language. So, if you can interpret, I'd appreciate your adivce.
About the truck, It passed ok a year ago for change of ownership, and has been driven less than a thousand miles since then. Mostly ten mile trips to Home Depot on the weekend. In getting ready for the smog check, I changed the oil & air filter, scoped the ignition & replaced bad coil & wires, tested the EGR valve (blow & suck through it to confirm one way action). In retrospect, the temp guage has been running a little low. Maybe I should have changed the thermostat.
The numbers:
@15 MPH CO2 14.3%, O2 0.5%, HC 251 ppm, CO 0.43%, NO 1173 ppm @25 MPH CO2 14.8%, O2 0.1%, HC 126 ppm, CO 0.08%, NO 558 ppm
Since I can't see the numbers change as I adjust things like a mixture screw, a simple adjustment would cost me over $100. I'd rather spend the $100 on a new catalytic converter if that would do the trick. What do you think?
Thanks guys.