What is the sound of one piston slapping?
What is the sound of one piston slapping?

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!

Illustration for article titled Waiting in Line for Emissions Test
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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?

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