[QUOTE=ps2cho;2897686]O2 levels are low, so cat was hot enough as you said.

No. If the catalyst is operating at maximum efficiency the measured O2 level should be zero. Catalyst "aging" issues increase the bed temperature required to achive maximum oxidation and reduction efficiency.

High HC at 15 MPH is typical of the cat bed being too cold. It heats up during this test, which results in passing the 25 MPH test. The NOx falilure at 15 MPH is marginal.

Shorting the R16/1 plug to reduce the rate of spark advance with engine revs and temporarily blocking the vacuum advance line to the EZL should yield an easy pass. Then if you want better low end torque and fuel economy, don't install the original resistor after the test.

To the OP: Search this forum for posts by me with search words like emissions, HC, CO, NOx, and R16/1.

Duke