Google is your friend. Cat's will definitely help but tuning that aftermarket carb with the correct tools will be key. Has the car passed in Colorado previously?
You could pass the bong to the technician before he tests your car.
Are you looking for the latest emissions testing requirements in Colorado? This guide has all of the regulations and testing locations for you to get your car tested. Click to find the location near you. Find addresses, hours of operation and phone numbers of testing stations near you.
www.emissions.org
Two Speed Idle Tailpipe Test in Colorado
Colorado requires emissions test personnel to perform the two speed idle tailpipe test on the following vehicles:
- Gasoline cars made in the 1981 model year or earlier
- Gasoline light-duty trucks made in the 1981 model year or earlier (Trucks weighing less than 8500 lbs)
- Gasoline Heavy – duty trucks made after 1992 model year or later (Trucks weighing more than 8500 lbs)
The two speed idle tailpipe test is pretty straight forward. First, test personnel place a probe into a vehicle’s tailpipe to measure the emissions coming from it. Afterwards, they attach a contact tachometer to the spark plugs of the vehicle, or place one on the vehicle’s hood if the test personnel are unable to get to the vehicle’s spark plugs. Tachometers typically measure the number of rotations of an engine’s crankshaft per minute or to put another way, the engine’s speed. Next, while the vehicle is in Park or Neutral, the test personnel will have the vehicle idle for 30 seconds. Then, the test personnel revs the vehicle’s engine to 2500 RPM. Finally, they idle the vehicle for another 30 seconds.
Parts Per Million (ppm) and Percent (%) are the units of measurement used to determine the test results. There are a small group of vehicles manufactured in the 1981 model year and earlier that are exempt from the two speed idle tailpipe test. Also, certain kit cars and vehicles manufactured outside of the U.S. may also be exempt. Contact a local Colorado DMV for further details.
