Just put the new sensor on the truck, fired it up and now it runs worse than ever! Any ideas on what is causing this?

 

Why did you replace the old one? That may give us a clue as to what is going on.

 

The reason I replaced the old one is after first starting the truck and taking off it would buck around and have no power. I took the old one out and it looks as though the contacts were gone. So I put the new one in, reset the computer and now it will barley start and when it does it back fires and won't even rev

 

It may be your computer going bad not the sensor so replacing it did no good. That is what happened to me bucking and sputtering.

 

I took the new one out and put the old man back in and its fine again, so I think I may have gotten a bad sensor. I thought it may be the computer as well, cause when I had the new sensor in, and the truck running I hooked my code reader up and it showed no codes at all, so it may not be registering in the computer as well.

 

When my computer was going crazy I had no codes showing up ever it may still be the computer my truck would run like crap then be ok for a few days then run like crap again this went on for a month before I took it to a shop and they said my computer is going out on me replaced it no more problem.

 

What exactly was your symptoms before you took it in and they told you you needed a new PCM?

 

Fuel pump ok?

 

Doesn't sound like CPS to me. I would lean towards fuel, tune up, PCM, or short. Of course, this also depends on what engine you are using too. 4.7 or 3.9?

 

I have the 3.9. I just did a full tune up on the truck (plugs, wires, cap and rotor) I replaced the fuel pump less than 1000 miles ago. I did notice that one of the ground straps is not on and I havent pin pointed where it goes quite yet, but regardless it ran fine before, and for a new sensor to be causing th truck to act this way is beyond me.