66mike
Newbie
new to this group - looking for some help before I lose my mind.
96 K1500 w/5.7Vortec, 100K miles - runs great but intermittent rough idle/idle up/bangs in 1-2 shift... will throw the same codes every time. P0122 and P0134 (TPS and O2 bank1 upstream)
I've swapped out 3 TPS sensors and when I check voltage I get 5V, so I'm suspecting the TPS is not the cause, it's being affected by something else that is stealing voltage from it? I already installed a new fuel pump, pressure approx. 60psi, visual wire inspection of TPS harness & O2 connector appear OK but haven't swapped out O2 sensor yet. Truck will run 100% for a day or so, and then randomly this issue will re-appear, doesn't seem to matter if it's warm or cold. Turning off ignition & re-start will immediately correct it, and after 3 starts CEL will go out on it's own. It seems to be down on power & my fuel mileage is horrible, even for these trucks. (no better than 10mpg)
If I swap out suspect O2 and problem persists, is PCM ground possibly the next place to look? I've replaced all the engine/chassis/frame grounds with #6 welding wire so grounds appear to be all good.
Help... this is driving me nuts.
96 K1500 w/5.7Vortec, 100K miles - runs great but intermittent rough idle/idle up/bangs in 1-2 shift... will throw the same codes every time. P0122 and P0134 (TPS and O2 bank1 upstream)
I've swapped out 3 TPS sensors and when I check voltage I get 5V, so I'm suspecting the TPS is not the cause, it's being affected by something else that is stealing voltage from it? I already installed a new fuel pump, pressure approx. 60psi, visual wire inspection of TPS harness & O2 connector appear OK but haven't swapped out O2 sensor yet. Truck will run 100% for a day or so, and then randomly this issue will re-appear, doesn't seem to matter if it's warm or cold. Turning off ignition & re-start will immediately correct it, and after 3 starts CEL will go out on it's own. It seems to be down on power & my fuel mileage is horrible, even for these trucks. (no better than 10mpg)
If I swap out suspect O2 and problem persists, is PCM ground possibly the next place to look? I've replaced all the engine/chassis/frame grounds with #6 welding wire so grounds appear to be all good.
Help... this is driving me nuts.