I recently had my 1997 GMC Sierra tested by the state for emissions. 2 years ago the readings were lower across the board and seem to have jumped a lot this time around. The truck still passed but I'm wondering if I may have problems developing. It could be that maybe I did not drive the truck long enough(drove 10 miles to test center) for the test and didn't get it as hot as the prior test?
What do you think the numbers show? The top picture is the test from 2 years ago and the bottom is the new test:
What do you think the numbers show? The top picture is the test from 2 years ago and the bottom is the new test: