Yet another weird 2.9 issue....

[bobbywalter]

Did you save your original O2 sensor? I was fighting the same symptoms for over six months. Mine ran fine until it reached temp, then it would buck, run lean just like it was running out of gas. Then after a minute or so it ran fine again. I tried everything and the problem would not go away. I changed the fuel filter, the in tank pump, the temperature sending unit, the regulator, re grounded the computer and nothing helped. That is until I put the old O2 sensor back in and I never had the problem again.

In hindsight my problem developed after I put in a new O2 sensor I bought from ebay.

I have since put in a new Bosch O2 sensor and everything is still working well.

that may have been an incorrectly pinned o2.


happens often.