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TPS after EBL Install

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Old Jul 18, 2020 | 07:12 AM
  #1  
KyleF's Avatar
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From: Lansing, MI
Car: 1988 IROC-Z
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.45
TPS after EBL Install

My TPS only gets up to 3.5VDC with KOEO, same occurrence with a second TPS. I did tap into the gray 5V reference for my MAP install.

What should I bee looking for that could affect my voltage. The tap in for the EBL should be a parallel circuit.
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Old Jul 18, 2020 | 07:20 AM
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From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: TPS after EBL Install

Is this with the key on engine off while sitting in the drivers seat pressing on the accelerator pedal observing the WUD, or are you physically opening the TPS lever with your fingers under the hood while measuring voltage? If you're sitting in the drivers seat and flooring the pedal, and the TPS percentage is not reaching where you need it to, then adjust this area in the bin;

TPS - ADC Gain Term for TPS

- Rob
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Old Jul 18, 2020 | 07:41 AM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: TPS after EBL Install

Check that the go-pedal is actually fully opening the throttle at the TB. A stretched throttle cable or even a floor mat under the pedal can prevent true WOT.

Note that the at-idle TPS voltage can be anywhere between .4 and .8 volts. The EBL auto zeros the TPS.

RBob.
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Old Jul 18, 2020 | 08:10 AM
  #4  
KyleF's Avatar
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Joined: Nov 2004
Posts: 768
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From: Lansing, MI
Car: 1988 IROC-Z
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.45
Re: TPS after EBL Install

Thanks again guys, I will get to troubleshooting this later today.

Yes, this is from the drivers seat using the pedal. Also, that is good to know on the auto zero. I have it at .5V right now because that was the setting for the 88 I have always used.
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Old Jul 18, 2020 | 09:00 AM
  #5  
KyleF's Avatar
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Joined: Nov 2004
Posts: 768
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From: Lansing, MI
Car: 1988 IROC-Z
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.45
Re: TPS after EBL Install

After checking for voltage at my MAP and TPS plugs and finding 4.5V. I plugged everything back in and checked WUD again from inside the car to find the same condition.

So I put the lap top on top of the car and went under the hood so I could see my meter and the WUD. Reach over to pull the trottle and then I see it.

See these clamps, nice and aligned


Yup, looks appealing but...

Sometimes you just have to laugh. See, I assumed it was something I did wrong with the wiring because I don't like doing wiring. We all know what happens when you assume.

Sometimes you just have to laugh

Last edited by KyleF; Jul 18, 2020 at 09:06 AM.
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