I have been messing with my idle for the past couple of days and finally got the issue with the IAC straightened out. The car will idle fine now but I have a problem with the TPS. Since I adjusted (lowered) the minimum idle, I havn't been able to get the TPS back to .54 volts. It just runs out of room for adjustment. I can move the sensor down a good bit to lower the voltage but the highest I can get it to read is .51 volts. I can't move the sensor any higher to obtain the correct reading. Is my sensor just bad (why would it go bad by only adjusting the minimum idle) or is there a way to zero it out or reset it? Thanks

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1991 Z28 - 350 TPI, T56, McLeod street clutch, LT4 pressure plate, Pro 5.0 shifter, ported plenum & runners, AFPR, Hooker shorty headers w/o AIR, Flowmaster muffler, homeade ram-air, SSM subframe connectors, Kenny Brown STB, Global West steering box brace, Steve Spohn adjustable torque arm and T56 crossmember

 

I just asked this same question from what I was told and since read you can't adjust TPS on 90-92 SD.I too have a 91Z.Looking at my TPS I couldn't see to move it didn't have any kind of slots by the bolts to allow it to move up or down.Maybe I'm missing something let me know

 

.51 to .54....

It will never know the difference. Its fine.

 

I realize that it doesn't really matter but it's just the fact that there is definitely something wrong somewhere if I can't get it to read properly. I'd like to set it to .58-.60 but I can't even get it up to factory spec.

 

Ok I guess mine isn't adjustable. I'll check the TPS when I get home to see if it reset itself. Should it be at .54 or .71 volts? I thought it was supposed to be .54