Throttle position sensor..........Help
Thread Starter
Junior Member
Joined: Jun 2001
Posts: 28
Likes: 0
From: Blue Ridge, Ga.
Car: 1987 Z28
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 273 Limited Slip
Throttle position sensor..........Help
When checking my throttle position sensor,it bounces around. The numbers go from .547 then to .543 then to .549 and so on. The fluctuation is there, with sensor tight and just probes connected. Is this the way it should be, or is this a sign of failing. Is on a 1987 TPI 305. Thanks.
Supreme Member
Joined: Jul 1999
Posts: 5,183
Likes: 42
From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
Maybe check another low voltage source with your meter, could be just noise.
A 40mv fluctuation wouldn't be anything I'd be concerned about, I don't think the TPS scales in the EPROM have that much resolution?
A 40mv fluctuation wouldn't be anything I'd be concerned about, I don't think the TPS scales in the EPROM have that much resolution?
Supreme Member
iTrader: (1)
Joined: Oct 2000
Posts: 1,062
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From: Pasadena, MD
Car: '87 Camaro IROC-Z
Engine: 385 HSR
Transmission: 700R4
Axle/Gears: 3.42 posi
Yeah, that's nothing to worry about, especially since the highest accuracy I've seen from a scan-tool is 2 decimal places. Mine goes changes a couple hundredths just from the engine warming up. 
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Greg Westphal
'87 IROC 355TPI/A4
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Greg Westphal
'87 IROC 355TPI/A4
Thread Starter
Junior Member
Joined: Jun 2001
Posts: 28
Likes: 0
From: Blue Ridge, Ga.
Car: 1987 Z28
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 273 Limited Slip
I was curious of it, because I have off idle hesitation. It's starting to get poor fuel economy. Was around 20 to a gallon now around 16.5. These are a few of the things I've done: new AIC, Bosch platinum plugs, new 8.0 wires, and the cap and rotor. Any other ideas would be great. Thanks.
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