I have an interface I wired into my friends nitrous setup and have a question on it. It pulls timing like it should, only at wot, only between the pills set on the window switch but it pulls timing even when the system is off. Looking at the interface itself the spray LED is on at wot on motor. Everything is plug in except one wire going to the window switch and another going to the noid relay. How do I fix this problem?

 

sounds like its not wired correct it should only get voltage when the kit is armed

 

Yea...but there are only 2 wires from the interface to be wired to anything.

 

which diagram did you follow?

Nick

 

Page 5 of the interface instructions, interface with rpm window switch wiring diagram. Has grey to iat, blue to window switch, brown to the ground on the relay, and white to pcm which I didnt use since I am not using top end fueling.

 

Did you make sure you got the switched 12V to the Arm switch, which gives power to the WOT switch wired correctly?

(Furthest left part of the diagram)

 

Yea that part is ok. Only thing I can think of is maybe I wired in the wot wire to 85 on the relay and the interface to 86.

 

Just checked the relay, its wired correct.

 

That "shouldn't" matter (85/86 being switched).

Check to make sure the ground from the Interface isn't shorted somewhere.

What are the settings on the interface? Make sure you don't have some sort of "zero fault" in the settings that would allow it to always pull timing?

Wait... I'm an idiot... None of that wiring we just discussed would be suspect if it's pulling timing but the noid isn't being activated as long as it's wired up per that diagram.

 

I got it, the switched 12v for the window switch wasn't wired into the arming switch.

 

Glad you got it straight!