I have run the HSW interface on my basically stock truck and had no problems, After I'd gotten EFI Live, I found out after logging, that with the Interface connected my IAT's were 0-1* weather the system was armed or not. I disconnected the controller and IAT's go back up to 120* (idling). Thinking this might have been an issue with the controller I swapped it with a brand new one with the same results. What I'm trying to figure out is weather this is normal or maybe I'm having another issue with another component.

 

Anyone?

 

Sound like it's pulling or blocking the signal. Maybe contact the manufacture and see what they say.

 

Do you have it connected to the IAT wire on your truck? If so it probably grounds out that wire or sends 12v to it constant so you can set a certain spot in your iat table to pull timing. That way you still have full timing when the controller is not on.

 

Harris is out of business..

It T's into the Mass Air Flow Sensor harness. It controls fueling and timing via the IAT signal wire. I was checking into it a little deeper yesterday. Figured out there is a problem with my window switch. Think I've figured it out.