mazdatweaker
+1y
. . .
If you post your emission test numbers. . .in a new thread. . .maybe call it something like
"I'm a FI Mazda junkie, an e-test flunkie," you might get some ideas from the forum about what to do to pass.
Before you start scatter-gunning money and time.
Personally. I would like to develop a series of articles which walk through repairing these B truck emission related failures. but historically I have found a lack of focus on the part of those with the problems which seem to prevent clear dialog and expedited problem resolution.
So the threads unravel.
There have been a couple exceptions.
There was a NOX-related issue with a carbed truck that was resolved once the owner of the truck simply cleaned his EGR valve. That thread resolved itself quickly.
There was a much longer NOX thread involving a missing EGR passage which took a while to track down, but that was because that particular truck was operating outside of US EPA specifications.
At this point, my perception is that if you get your vehicle into emissions compliance, your fuel mileage is going to improve co-incidentally.
The closer one can get an engine to optimal air-fuel blending, the better both power and fuel mileage will be.
From Wikipedia:
Air-fuel ratio (AFR) is the mass ratio of air to fuel present during combustion. When all the fuel is combined with all the free oxygen, typically within a vehicle's combustion chamber, the mixture is chemically balanced and this AFR is called the stoichiometric mixture (often abbreviated to stoich). AFR is an important measure for anti-pollution and performance tuning reasons. Lambda (?) is an alternative way to represent AFR.