Thanks for the input Duke!

I believe the cats were hot as I did drive on the fwy and the aux fan kicked on when I was at the shop (turns out the AC was on when they ran the test - could that have made a difference?).

My mech who just tuned it up today, who does not have a dyno (there were 72 smog stations in my county and now there are only 8 with the new dyno!) ran a before and after test on his tester and there was a very slight improvement with plugs and oil change.

Here are the results of my failed test

15 MPH:

CO2 - 13.5
HC - 187 (126 max allow)
CO - 1.67 (0.79 max alow)
NO - 460 (1316 max allow)


25 MPH

CO2 - 13.7
HC - 166 (101 max allow)
CO - 1.31 (0.59 max allow)
NO - 417 (1112 max allow)

The car does not have a smog pump. Thanks for your help and assistance!

__________________
E55, 300E, 65 Hipo Mustang, 66 Shelby GT-350, 69 Mach I, 66 Fairlane GT Conv., etc