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how to know when throttle pos. sensor is bad...

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Old 08-03-2002, 02:26 PM   #1
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how to know when throttle pos. sensor is bad...

how do you know when your throttle position sensor is bad on a tbi? i think mine may be bad, thats what everyone says it may be... thanx
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Old 08-03-2002, 04:37 PM   #2
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Car: 1988 Pontiac Firebird, flat black
Engine: Stock 305 LO3
Transmission: Five speed

The TPS tells the computer where the gas petal is so it can give the right amount of fuel. Does your car cut out? WHen you change the position of the pedal does it come back? From what I have heard it works by a voltage. Not sure how to check it, or how much it puts out.
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Old 08-03-2002, 04:37 PM   #3
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someone please help me out..
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Old 08-03-2002, 04:43 PM   #4
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Car: 1988 Pontiac Firebird, flat black
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At a pedal position does your car cut out? Any? The TPS car develope dead spots. Or it will not start at all. Even at start up if it doesn't unless you give it a little gas, that could also be the TPS.
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Old 08-04-2002, 10:59 AM   #5
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Dead Spots

You will also get dead spots in your acceleration....
You push your foot on the pedal, and partway down you may experience your engine cutting out, or huge hesistation at some point. Not very much fun.
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Old 08-04-2002, 06:36 PM   #6
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EXACTLY!
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Old 08-05-2002, 12:33 AM   #7
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Car: 1992 Camaro RS, Teal
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Also, the car will "surge" when it's sitting at idle like at a light. It's not very fun to have the brake lightly pressed and have the car lunge forward almost rear ending the person in front of you.
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Old 08-06-2002, 11:19 AM   #8
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seriosly i know what you mean, well mine idles too low too and dies sometimes, its been noooo fun to drive so i havent moved it in liek a week....just cuz im poor and cant aford my tps yet...
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Old 08-07-2002, 08:29 PM   #9
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it sences the throttle angle by voltage hence throttle position sensor.(tps) u can check the voltage by probing the conector and using a volt meter.I dont remeber correct voltage of the top of my head , is it .45 someone will know im to lazy to go look.make sure the voltage changes acording to the trottle angle of the trottle blade.
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Old 08-09-2002, 10:55 AM   #10
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To test put volt meter probes into connecton on tps. In the closed position you should see .56 volts +/- .07 volts. In the wide open throttle position you should see a reading above 4 volts. In between should be smooth rise to 4 volts with no dead spots. Do the test with the ignition on but the engine off. Hope this helps.
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Old 08-11-2002, 02:03 AM   #11
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My 91 RS Kept giving me a 22 trouble code, and when the Service engine soon light would come on, it would try to take off (usually through a red light!) the TPS Fixed the problem
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Old 08-11-2002, 09:30 AM   #12
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SES alway comming on and car runs realy rough. TPS solved all of that. Now I'm saving more gas....
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Old 08-11-2002, 10:52 PM   #13
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Whoa! check it out! Two guys with Taz as their avatar that both replaced their TPS and it fixed both their problems! CRAZY! Maybe it's a sign.......
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Old 08-11-2002, 11:59 PM   #14
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TPS issues

I had BOOKOO problems with my TPS on my NEW Holley. I kept fiddling and fiddling with it, nothing worked right. I had to replace it and everything worked right.
Just letting you guys know even if a TPS is new, doesn't mean it's not the problem.
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