[Pawtuckett]

I tried using the search function to see if anyone has had the same issue as me, but I couldn't find anything that quite answered the question I have.

For some background, I have my MPGuino hooked up to my ECU for VSS and Injector Pulse and to my stereo for power and ground. My kill switch is a SPDT rocker switch acting as a ground interrupt circuit that is connected to the ground wire of my PGM-FI unit under my dash.

Now, the issue: Whenever I flip the kill switch to break the ground for the PGM-FI, I notice that my Instant MPG plummets momentarily (to, say, 5 mpg or so), and then goes to 999999, indicating that the fuel has been cut off successfully.

And the question: Is this normal operation? Do the fuel injectors actually dump a bunch of fuel (relatively speaking) when they are cut by the kill switch?

I know I'm not the only person here that hooked their kill switch up to the PGM-FI unit, but I don't know if this issue is particular to my situation or not.

Thoughts?