TPI TPS voltage/cold stumble
Thread Starter
Junior Member
Joined: Apr 2002
Posts: 33
Likes: 2
From: Glen Burnie, MD
Car: '85 Z28 TPI
Engine: 305 F vin
Transmission: 700
Axle/Gears: 3.23 posi 10 bolt
TPI TPS voltage/cold stumble
Can any one tell me the voltage setting for the TPS on my '85 Z-28 w/ stock 305 TPI motor
I am also experiencing a dead stumble when taking off (even gently) with the engine cold. This is my first TPI engine so I'm learning as I go. Thanks, Randy
ranbo108@juno.com
ps the S-10 Blazer in the pic is for sale
Senior Member
Joined: Jul 1999
Posts: 784
Likes: 0
From: Sacramento, CA
Car: 89 Iroc
Engine: 383
Transmission: 700R4
Axle/Gears: 3.45
According to my manual (it doesn't specify years only TPI) the TPS should be set at .54 volts with a margin of .075 volts either way. These readings are taken between the middle and bottom pins.
Supreme Member
Joined: Aug 1999
Posts: 2,441
Likes: 1
From: sweden
Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
Member
Joined: Mar 2002
Posts: 277
Likes: 1
From: Boston, MA
Car: Corvettes
Engine: Modified L98 & LT5
Transmission: DN 4+3 & ZF6
Axle/Gears: 3.07 & 4.10
Re: Thanks Guys
The F-Bodys I think are the same in this department so this should hold true. Typically you can set your TPS as high as 0.68v at idle before throwing a code. If it does throw it, back down a little at a time. I think the computer tosses the code if it sees higher than 0.68v at less than 2000 RPM. I found on my Corvette that it gave ever so subtle gains in throttle response. It causes the car to idle about 100-200 RPM higher, but I don't mind.
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