Contour Enthusiasts Group Archives Forums General Troubleshooting A/F too rich since MIL eliminators

yes, i installed them in the downstream sensors, between the pre-cats and the main cat.

the upstream sensors impact the fuel trim tables. the downstream describe pre-cat efficiency, right?

so how come my car got richer after installing MIL eliminators? could it be that it's always been rich but the fuel used to burn up in the pre-cat but now is advancing further down the exhaust system? hmmmmmmmmmmm