Catalytic convertor stopped up?
I have an 99 ford ranger with 3.0L ff and its 4wd… Not that it matters if its 4wd. Anyways, it has set a lean code on bank 2 upstream and keeps bogging down and then picks up and takes off good. Now, I know I could just hook up a vaccum gage to upstream O2 sensor… Or for that matter remove it and see how it runs… But its rainy here and I have no inside garage to work in. So, just lookin for some opinions as this is my daily driver to the shop where I work. Also, as a side note I would like to mention that I hooked up my fuel pressure guage to the fuel rail and it held at 65-70 psi at idle and a consistent 65 psi at operating speeds… BUT if the vehicle is off and you turn the key to on position, the fuel pumps to 65 and then drops rapidly to 0. The fuel rain should be holding pressure. This leads me to think there may be a possible fuel pump issue, but again, the psi seems to hold consistent once the engine is operating. So… I'm back to thinking of the cat.
Have you consider the fuel pressure regulator is not working. A faulty pressure regulator will cause the fuel pressure to drop like that.
Sounds like fuel pressure regulator. If it didn't bog down, I'd say bad check valve in the fuel pump. But with the bog, I'd head for the regulator.
This is the asker, for the people considering the problem to be the fuel pressure regulator, I would like to mention that I drove it down the highway with my fuel guage connected up to it and when the bogging issues occurred at highway speed, the fuel pressure held steady at 65 with the engine under load. But it was a great idea none the less and I appreciate the answers.
Your fuel pressure is fine so forget about that for now. Check the rubber elbows on the hard lines for the PCV valve very, very closely. They get soft and split and can open up wide under varying degrees of throttle application. This will cause your lean code and bog if they're bad enough. Also check the gasket between the upper intake plenum and the intake manifold with some aerosol carb cleaner for leaks. Definitely clean the MAF sensor or try another one if you have access. If you're desperate try switching bank 1 and 2 injectors and see if the code changes to bank 1.
I don't think it's a cat because you say: "keeps bogging down and then picks up and takes off good". It wouldn't go well if the cat was plugged.
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