I have a 1990 305 tpi and the tps keeps going bad on it, i have replaced it twice and it still goes bad i have also replaced the computer in the car a have also replaced the icm , Thinking it might of been a related problem but the funny thing is when the car is cold it has extremely good throttle responce and the tps works perfectly but the second it warms up a little, the tps ****s the bed im am not geting a code or anything when i hook my car up to a scan tool Then stuff the pedal to the floor the throttle is only opening up to 25 percent and the voltage is low on the tps When i replace the tps it will run grate for a day or two then back to its ****ty self agian I would appreciate any help anyone has to offer thanks alot

 

could be wiring.....

 

IROC,

When the TPS "fails", what is the bias voltage across the sensor? 5.0 VDC?

 

Well, it may be more than one prob, but I'd look at the bolts that are holding the TPS in and the O2 sensor for kicks. Try putting a db of antiseize near the head of the bolt. It may just be moving a tad once you warm up. BTW have you bypassed the TB yet?

 

On this Camaro i have replaced the 02 senser the computer the icm and have made sure the bolts on the tps are to spec. when the car is cold it gives the tps full voltage but 1 or 2 min into letting it run the tps is un responsive. the voltage on the tps is usualy around 1.54 take or give a few when it craps out could i need too get a new chip in my computer??
thanks