OBD2 problems, Check Engine light on!

[Strokin In Texas]

I cant pull codes! I've used all kinds of scanners including an auto enjunity, and none of them can connect! I'm at a loss! I've got power to both cigarette lighters and it seems I have it to the OBD2 port. With the cheaper scanners, I tried scanning it when it was running and it killed the truck so I know there is some sort of interaction, but I cant figure out what the deal is.

It used to come on only once in a while when the motor was cold, but now it is on all the time. It has a lope idle randomly at stop lights, if I let the clutch out and move forward a few feet it smooths out. Some times it runs just fine. It seems to do it less when my chip is in the stock position.

If anyone has any ideas I would be grateful! It has been about 2,500 miles since my oil change. (Rotella 15-40w and Lucas oil additive)

[Strokin In Texas]

I pulled the chip, same problem. It ran just like it does when its on the stock tune, check engine light was still on.

I also put a different CPS sensor in, no change.

I put a new air filter on (mine was pretty dirty) and it ran a bit smoother and spools a bit quicker, but still has a rough idle at times and has the check engine light on.

Thanks for any more input! I would really like to figure out why the obd2 scanner doesn't work. Any ideas on how to fix that? Any wright ups on how to test or diag it?

[hboehning]

im in the same boat any more help for diagnosis would be greatly appreciated.

[Boomer22]

After taking mine to ford because of the same problem they told me it was a bad map sensor.

[lwillson]

Does the autoenginuity have the Ford enhanced package? if it does not, it will not connect to a powerstroke engine. How advanced are the other scanners you have tried? Basic scanners will not work on the 7.3 either