Strange Wells TPS issue - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-07-2015, 06:43 PM   #1
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Default Strange Wells TPS issue

Hi all,

I usually don't post to forums because I like to fix my own issues and not ask for help, but I am finally stumped. My issue is with the Wells TPS retrofit. I have installed the Wells 201 TPS on my 92 Miata and wired it my DIYPNP using the DIYautotune instructions.

Right now I am able to successfully calibrate the TPS and it works with the key in the on position but motor not running. But once I turn the motor on, the signal is drawn to 0% throttle. It will jump if I blip the throttle but then will get drawn back to zero quickly and stay there even if i keep the throttle held open. I have double checked the wiring and I have tried running separate wires directly to the megasquirt to make sure it is not a wiring issue. It seems to be an issue with the MS but what puzzles me is that it works while on but not running.

I'd appreciate any suggestions or help you guys could give me
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