[69fordf100]

i have same issue, but the tranny is shifting funny also after the problem started. was having rough idle but that mostly cleared with a new iac. any ideas?

 

[69fordf100]

most of the evap equipment are behind/under the battery. Look between the battery box and the fender for the purge solenoid and just behind the battery box (towards the firewall), under the PDC for the pump. I had an evap code on forever and I could never figure it out, until I pulled my battery tray out and found some random vac lines that were hidden under there had split.

If you don't know where they are, they are really easy to miss

well, my code came back the other day so i went searching.... I did find the can under the pdc and started following the lines. found one going to a line with a tire valve and label that said no more than 1 psi. not sure where thats going but i did find a split line at the valve. i cut the line back some and reconnected but i'm still having the hard shift and code. not much time after to check more. just one question. what is the thick hose leaving the purge and where does it go?

 

[69fordf100]

That tire valve is a test port. It's just there so you can hook a scanner to it and test the evap system. FWIW, that's where mine failed too. I actually found the hose in two pieces... minor leak 'eh?

Now that you have it fixed, reset the PCM or clear the codes with a scanner and see if they don't go away. It takes something like 20 on/off cycles before they clear by themselves.

That thick hose goes to the charcoal filter off the gas tank. The gas tank vents through a filter that stores the vapors, then every now and then the pump kicks on and purges the canister.

I also don't think that hard shifting is evap related.

the hard shift started i had left my xm plugged in sitting for a week and ran the battery dead. today it was shifting better for some reason. its day to day