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Old 08-14-2013, 04:31 PM   #1 (permalink)
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Dumpmobile - '95 Honda Civic EX
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Question MPGuino - Question about kill switch & instant fuel consumption

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.



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