Iv read through a bunch of forums chasing this down and have yet to come up with anything. Iv replaced plugs and wires, cap and rotor, TPS, MAP,MAF, AIC, Air temp sensor. The fuel pressure hits 60 and bumps down to 55 and holds, doesn’t bleed off. Is that low enough to be causing my issue and it being a bad pump or regulator? Or would a clogged injector be more likely?

 

This is a single bank lean so we don't go with global sensors first like the MAF.

What are your fuel trims at idle an 2500 in park?

Can you graph your oxygen sensors in live data?

George

 

Original problem was intermittently running rich/lean on both banks. MAP and MAF solved that and it seems to be running fine for the most part, but still throws lean code on bank 1, and sitting at a light or stop sign idles rough occasionally but runs fine not under load or as soon as I take off.

I don’t have the means to test anything with live data currently, but have a friend that can, and plan to Tuesday. Will post results after I get them.
Thanks for the reply!

 

We are starting the process of determining if it is actually running lean or if its a reporting problem and then narrowing it down from there.

George

 

I replaced the 02 sensor for that bank and also replaced the coolant temp sensor, and so far the code hasn’t come back and everything runs great! The temp was reading normal, but I had noticed the cab getting warmer here recently. I also smelled rotten eggs at one point which I read was a sign of a bad 02 or plugged cat. One of the two solved it!

 

Glad your fixed up.

George