ok i have been reading all the archives about this topic and went out to test mine. so i disconnected the sensor and put the key in the on position. then i took my probes and stuck them to the black (ground) wire and the grey (reference) wire and got a reading of 5V....thats good. then i touched my probed to the black and blue (hot) wire and got 0. so i strated moveing the thottle and got 0. it just never moved. so for someone who has done this before...did i do anything wrong. what do you think? or is it fried? btw, i am not getting any codes....so whatcha think?

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1990 Firebird 3.1
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- Auto Trans, TA Body Kit
- Home Made C.A.I.
- ASP Underdrive Pulleys
- MSD 8.5mm Superconducter Wires (custom-cut)
- MSD GM Blaster Coil
- AC Delco Cap & Rotor
- Bosh Platinum +4 plugs
- Mobil 1 Synthetic Fluids
- 2.5" Hooker Aero-Chamber Cat-back
- 2.5" Hooker Elite Stainless Extension Tips
- GTS Blackouts (stickers removed)
- TB Bypass

KILLS = Dodge Daytona (stick), 2000 Toyota 4 Runner 4WD,
1997ish Ford Explorer, "older" Jeep Cherokee (don't ask why they are all SUVs...who the hell knows?)

LOSSES = 300zx (had him half way through 2nd, he was manual)

"The racing dice added 5hp...I SWEAR!"

 

I believe you have to have the TPS connected to the sensor with jumpers of some sort... paperclips worked great for me... just take 3 big ones... make them straight and stick them inbetween the TPS and the connecter, then read the voltage from them.

What you did was check and make sure that 5 volts were going into the sensor... but because the sensor wasn't connected you wouldn't be able to read what it was returning...

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1985 Camaro SC - 2.8L, auto.

http://www.xenodrgn.f2s.com/Frontright.jpg

 

that makes complete sense...so i went back out and these are the readings i got:

idle: .7
WOT: 4.4

now, i read that it should be .54ish at idle...and 4.5 - 5 at WOT. so i would guess my WOT is ok, but my idle seems off no? is it something to worry about or is it acceptable?

 

come on guys, what do you think of my numbers.....they should be good right? or is my idle number a little high?

 

SAE,

I could be mistaken (again) but your 1990 MPFI may have a non-adjustable TPS sensor. I'm not certain what year the V-6s went to a fixed sensor. If the sensor is non-adjustable, any idle voltage under 1.0 VDC is acceptrable since the ECM will interpret any number under 1.0 V as a base line.

If the sensor is the adjustable type, the desired setting on a V-6 is 0.49-0.61VDC. If the voltage is that high on an adjustable TPS, someone may have tried to raise the curb idle by turning the minimum air position adjustment (throttle stop screw) and in doing so completely forked over the ECM/TPS/IAC control of the system. If that's the case, you need to reset the minimum air position and then the TPS.

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Later,
Vader
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"Let the bodies hit the floor!"
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