Originally Posted by calistang05

I got smog in two months and I passed it a couple years ago by just putting my stock air cleaner back on and re-flashing my 91 tune back to the stock tune and driving it around for a week before smogging and had no problems passing. Are you re-flashing back to stock tune?

Originally Posted by ziperhead

I go through this every year.

When you re-flash your calibration the IM monitors are reset and the Ford Drive cycle needs to be done. If your IAT'S are over 100 deg you need to do the drive cycle twice per step 14 like I do .. lol. I get a scanner from Autozone and monitor the IM's until there ready and go get her tested . The Evap is the toughest. Just follow the link above.

Tips from other post's

The EVAP test must be completed within the first 30 minutes of operation or it will not invoke.
Starting with a COLD engine and ambient temp above 40F (40 to 100F) with 1/2 to 3/4 tank of fuel.
Load your Emissions Tune with your XC2 or Diablo, or whatever you use.
Plug in the Reader.
Turn Key ON without starting the engine.
Clear any codes and this will also reset your emission monitors to clear.
Turn Key OFF.
Turn Key ON and start the engine.
Idle 15 seconds before you do anything else.
Then go drive on a level as possible road at 40 to 55 mph for about 10 minutes after your coolant reaches 170deg.
avoid sharp turns or hills that will slosh the fuel around.
A little pre-planning of your route helps here.
Use an even and slow throttle depressions to accelerate and decel.
Monitor the reader for the EVAP ball to go steady.
May take a few attempts to get this one but if you can get by EVAP the other tests are easy to get done by just popping on the freeway and driving around town.
When you have the green light and no codes your ready for emissions testing.

Takes me all of 10 miles or so