I went 2 adjust my tps today and the tech article said it should be around .54 volts (I think) and mine is around .o46. What's wrong? and how do I fix it?

Thanks for any help in advance!!!

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Bad A$$ Boys Drive Bad A$$ Toys

 

That is fine. The computer reads anything below 1 volt as nothing. It is meaningless to the computer.
Its the WOT Voltage you need to worry about. it shoulfd be about 4.5-5Volts so the computer can read WOT mode.
This was told to me by a guy who custom burns chips for TBIs so I would assume it to be true Do not know first hand I have my TTA set at .56Volts closed and 4.8 WOT

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

You have the 86, right? Yeah, you should play with the TPS adjustment to get it nearer to spec. The TPS's on our year of cars (85-89 2.8 MPFI's) aren't self-adjusting; the self-adjusting ones came out in '90.

You need a digital voltmeter ($8 through http://www.harborfreight.com ) and some alligator-clip jumper wires ($3 at Radio Shack). You also need a torx socket (star shaped) to fit the TPS sensor's mounting screws. Don't tighten these down too much; you can crack the TPS housing, OR strip out the throttle body.

With the DVOM hooked up to the car, you check your voltage at idle & then at WOT. If the results aren't acceptable, you loosen the TPS screws, and "slightly" spin the TPS either clockwise or counterclickwise. Then you snug up the screws, and check voltage again. Make sure to "snap" the throttle plates open & closed before checking voltage; this makes sure your TPS doesn't get stuck on it's own and give you a fake reading.

I was never able to get my TPS reading at WOT past 4.29 volts. Glenn91L98GTA (another PROM burner) told me that the computer enters PE (power enrichment) mode when the TPS reads anything past 4.0 volts, so I stopped bothering with getting my WOT voltage to 4.5. (Odd how my GM manual says the ECM needs 4.5v!)

Setting the TPS at idle will, however, affect the responsiveness/performance of the car at part-throttle conditions. Say you've got your foot 6/8 of the way down- if your TPS is adjusted too low, your car will think your foot's only 5/8 of the way down- and you don't want that, do ya? Adjusting the TPS too high will also result in poor performance, since the computer will be expecting more air than it's really getting.



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-Tom P (Hot rodded 1986 Firebird 2.8l)