The Portland area requires emissions tests for any vehicle that’s model year 1975 or newer, so here I am waiting in line in my 27-year-old truck. *Update*: it passed!

Hope everything checks out! AMA I guess.

My truck passed! Here are the numbers:

HC Target: 220 ppm, Test: 97 ppm

CO Target: 1%, Test: 0.2596%

CO+CO2 Target: 6%, Test: 14%

I’m a little confused about the last one. I guess it’s a lower bound? If it were too low then that would mean too much O2 is getting through unburnt? Or through the cat?