dodson55

iTrader: (18)

I have a customers 99 silverado 5.3 that keeps burning up the tps, it just went through its 4th one in less then 6 months when it goes it sets a p0121 and p0123 code and will not zero out at idle and some even stick at percentage and wont go up or down no matter what the throttle is at, all the replacement tps sensors have been new and we have got them from two different places so i dont think its defective sensors i have ohmed the harness out and did a shake test while being ohmed there in no voltage or ground anywhere it shouldnt be, the pcm in sending the 5 volt vref like it is suppose to everytime i have checked it, i have did a internet search and can not find anyone that has this problem and cant find any gm tsb on this problem i am just wondering if anyone else has had this problem and what you did to correct it i am thinking that the pcm may have a intermitten problem causing an over voltage to the sensor burning it up but i hate to change the pcm out on a guess

MontecarloDrag

iTrader: (3)

Check if the TB blade isn't turning too far at WOT and damaging them