Let's beat the TPS dead horse ....

I did a little work to the truck over the weekend, mainly fuel filter and a new TPS sensor. When I first switched it, I was reading around 1.2 volts DC and was getting the expected increase when activating the throttle. Drove the truck home from family's place in SC to ATL, only notice some rougher shifting when coming to a stop.

Yesterday to try and adjust the position of the TPS, and the next reading was at .82 DC. The shifting was smoothed out for sure. Today while driving around for work the truck started idling very poorly, to the point of stalling if I didn't give it some throttle at a stop or idle. Adjusted the TPS again until it read right at .96 DC, closest to the number that I read to be ideal. One odd thing of note is that all of my signal readings were gained by probing the green wire across ground (negative terminal), but I thought that the black wire was signal, and the green was ground?

End of the day, I think my stalling is more consistent with a vacuum leak somewhere, but the timing had me wondering if the voltage adjustment tolerances are that finnicky. Logic would suggest it wouldn't affect the truck's performance or driveability that much, but is a couple tenths DC either way within reasonable tolerance?

 

.9 is ideal but it should work fine at .96, just slightly richer.

 

Turns out, my running issues were vacuum related as suspected. Intake manifold gasket was blown out from age. Luckily the shop I just got the truck back from was able to address it on the fly without it hurting the wallet too much.

Thanks for confirming the voltages I had been reading!

 

my apologies, erroneous posting.