How do Cummins pass AZ emission tests?

[MTTwister]

- prompted by a different thread, maybe even a diff site.. :(

Eventually I'll be moving to AZ. From the Dodge's I've seen around town 'up here' - they're real mosquito killers. No way they can pass the opacity / emission tests. Smoking suns of a gun.. Do they have a different standard, or whaaa ?

[moedog]

THEY COME FROM THE FACTORY ABLE TO PASS, BUT MANY GUYS ARE TURNING UP THE PUMPS, TURNING UP THE COMPUTERS, INJECTOR UPGRADES AND THEN THEY REALLY POUR OUT THE SMOKE

[Craig M]

Many states do not have tests for the diesels. Even in the ecco state of California we have no visual or emmisions test on our diesels. Gas engines are a different story. Because of this lack of any testing on the diesels ther are a large number of hot 454's running in diesel registered trucks here in California.

[Dart]

My 97 c2500 recently failed emissions here in Phoenix. The truck sat for a year +/-, as I bought a new Dodge Cummins. I was going to sell the Chevy, but sold another vehicle, and kept it.

Truck was running good, a little smoke. I assumed the diesel fuel was old, contributing to the problem. During the test, they replaced the sensor, running the test sequence 4 times, as though they could not believe the results. I could not see significant soot from the cab.

Ran the old fuel out of it, and ran a cleaner in it. It passed, just barely. I could not see any significant soot coming out. Interesting that the employees mentioned "Diesel failing emissions - thats something new!"

Hate the "snap idle" test, and running the engine clear to redline. Not the way I learned to run a diesel engine.

I agree that a lot of the Dodges here in town really belch the black smoke. Same with some Fords. My Dodge basically emits no soot, even under full load uphill with a 11,000 pound load.

Regardless of emissions test, seems to burn clean to me.