I see. I usually do those adjustments in the code, but your way could be useful as well. It would make for quick testing.
Does your switch isolate the TPS from the resistor? or does it put them in series when activated?
Also, could you post some pictures of your propane system in your album or in a separate post? I would like to see how you did yours. I'm assuming your ECM uses a MAP sensor ?
My Focus has a MAF, so I'm going to have to do some creative routing to try the propane. I'll have to avoid the hot wire of the MAF.
I have used Propane on older carbureted vehicles for cold starting in winter, and never experienced a backfire. Has your system ever popped on DECEL or any other time? I have some concern because the Focus has a plastic/composite intake manifold.
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