Faulty TPS Sensor?
Thread Starter
Member
Joined: May 2005
Posts: 479
Likes: 0
From: Glasgow, KY
Car: 87' GTA
Engine: 350 L98 TPI
Transmission: 700-R4
Axle/Gears: 3.27 9-Bolt
Faulty TPS Sensor?
Ok, isnt the car supposed to idle real high when the TPS is unplugged?
Because, I currently have an electrical problem with my car, dont know whats causing it, but I unplugged the sensor while the car was running, and the idle didnt change one bit, yeah the SES light came on, but no idle change.
Isnt the car supposed to idle fast with the sensor unplugged?
Is my sensor bad?
Because, I currently have an electrical problem with my car, dont know whats causing it, but I unplugged the sensor while the car was running, and the idle didnt change one bit, yeah the SES light came on, but no idle change.
Isnt the car supposed to idle fast with the sensor unplugged?
Is my sensor bad?
Senior Member
iTrader: (1)
Joined: Mar 2005
Posts: 646
Likes: 0
From: San Antonio
Car: 1981 Camaro; 1986 Z28
Engine: LT1; LT1
Transmission: 6 speed; 6 speed
Axle/Gears: 3.73; 3.42
the only way to know for sure is to plug in a DVOM and measure the volts (at the blue wire) as you move the throttle. It should be around .50 volts at idle and move closer to 5 volts at WOT.
Senior Member
Joined: Oct 2003
Posts: 942
Likes: 0
From: LaGrange (10min from Poughkeepsie), NY
Car: 1992 Camaro RS - not real slow anymore...
Engine: SPDC 360 MAF EFI /w a Holley Stealth Ram
Transmission: T5 untill it blows up from to much torque
Axle/Gears: Ford 9" /w auburn pro & 3.89's
With the TPS unplugged, your not letting the car know when your stepping on the gas and it will lag. You do not want the computer to figure out the TB is opening based on the 02 sensor. What 1981LT1 said is correct. Sensors such as this only work on a 5v system due to the voltmeter and resistor inside the ecm. I would check your power and grounds to the sensor also. Ground should be 0v while power supply should be 5v. The last two measurements should be the same for idle and WOT. But, you may test them on KOEO. The signal wire is what fluctuates based on the resistance within the tps itself. Make sure your TPS returns quickly at WOT and doesn't range all over the place in any positions.
Thread
Thread Starter
Forum
Replies
Last Post
BumpaD82
Tech / General Engine
37
Feb 26, 2016 02:57 PM




