Throttle position sensor
Thread Starter
Junior Member
Joined: Dec 2009
Posts: 7
Likes: 0
From: Wesley Chapel FL.
Car: 88 IROC Z
Engine: 305
Transmission: 700R4
Axle/Gears: 3.73
Throttle position sensor
Got my 88 IROC a week ago,check engine light was on.Got a scanner and it says TPS voltage low.Pulled it up and it was only .19 volts,read it was supposed to be.54 Tried adjusting it but can only get to .35 before i run out of adjustment slot.It looks like a new part. Do i slot it out? do i need to adjust the stop screw on throttle body? It still has the plug in it.Looking for some advice.
Moderator
Joined: Jul 1999
Posts: 17,262
Likes: 168
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Throttle position sensor
Your old one is probably worn out. Replace it.
0.54v is fine. 0.50v is a perfect setting but anywhere from 0.045v ~ 0.055v will work.
0.54v is fine. 0.50v is a perfect setting but anywhere from 0.045v ~ 0.055v will work.
Supreme Member
Joined: Jul 1999
Posts: 2,149
Likes: 4
From: Mims, Florida
Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
Re: Throttle position sensor
Yes, I agree with Stephen. It sounds like your TPS is bad, replace it. BTW: I have my TPS set at 0.60V. Make sure you buy a TPS with slotted mounting holes so that you can adjust it.
Member
iTrader: (6)
Joined: Jul 2005
Posts: 443
Likes: 0
From: Northern Kentucky
Car: 1991 Trans Am GTA, 2003 Grand Am GT
Engine: 350 Tune Port
Transmission: 700R4
Re: Throttle position sensor
I replaced my TPS on my 91 GTA but the sensor was not slotted, therefore non adjustable. Did they change the TPS on the speed density systems?
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Throttle position sensor
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Thread Starter
Junior Member
Joined: Dec 2009
Posts: 7
Likes: 0
From: Wesley Chapel FL.
Car: 88 IROC Z
Engine: 305
Transmission: 700R4
Axle/Gears: 3.73
Re: Throttle position sensor
Thanks guys,will do.
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