gta_knight

Hi all.

still working my way around this 3.1 and I thought I would check the TPS. It's reading 2.10 volts with the ignition on?!?

I used to own a 5.7 TPI and obviously that needed adjusted manually to 0.54 volts. I've been told the TPS on these V6 cars is self adjusting? So if that's the case should it still read that high when checking it. Or is this one screwed and should be 0.54 also?

Thanks

Six_Shooter

iTrader: (2)

That's definitely an issue, however, did you connect the ground for your DMM to the TPS ground? Sensor ground may not be at the same potential as chassis/engine ground. TPS voltage should be between .4 and .8 IIRC with the TPS closed.

gta_knight

no I used the battery negative as a ground as usual. But i can try it again using the tps's own ground wire

Mark RWC

A search shows this TPS 213894 by AC DELCO fits 91Firebird 3.1

This TPS looks very similar to the TPS used on my 94 Silverado V8 throttle body. The mounting holes in the TPS sensor do not allow for adjust with elongated mounting holes that allow adjusting the voltage like my 88 2.8 Firebird.
Recently had a TPS on 94 Silverado 350 V8 requiring replacement due to it having a dead shot causing problems when accelerating. Bought a house brand replacement from Autozone because it was in stock. When the Autozone house brand TPS was installed the test reading .2 volt higher than acceptable. It worked better but when the engine first started acceleration was boggy and truck would stall at stop sign only when cold.
Replaced with AC Delco original equipment TPS. Voltage test when AC Delco was lower and with in acceptable range. Test drove the truck and now no stalling when cold. Cold idle was a higher RPM and idle when fully warmed up was slightly higher. If the TPS reading high is not a new AC Delco I would suggest getting a new AC Delco TPS and see if it solves your problem.