Hello all, new to the site and have a question: I have an 85 bronco ii 2.8l, carb, with around 109K on it , ran pretty good, some stubles here and there but found out how to read codes and went from there.... Retreived codes 23, 31 and 84. Checked TPS, had voltage to sig return pin but was low, pulled the carb, bought a rebuild kit while i was at it and redid most of the gaskets but did not take the inner parts of the carb out, put on a new TPS, installed the carb, unhooked battery for about half an hour and noticed it idled very high. Once you were moving the rpm's would drop but at idle would climb again. I ran the codes again and got 31, 63 and 84. checked volts from black to vref i have 4.9 and from black to sigrtn i have 0. i have traced all 3 wires through the bundle and did not see any breaks i know that the green wire goes to the ECM? but i do not know what to check from this point, Any help or insight would be greatly appreciated.

 

I'd be looking at a possible defective TPS. It's just a variable resistor. You can ohm it out with it unplugged.

 

Well i switched the meter to omhs and tested the tps and nothing.... So for the hell of it i put the sensor back in that gave me the 23 code and guess what i have voltage just very low and the old tps sensor was cracked. This one was a standard motors product actually the second but rockauto made it right but i just now ordered a motorcraft one. Thank you for your input