Just one of them, should probably do the other... But its been two days and the CEL hasn't come back on after I cleared it. Still stumped

 

Fuel Pressure is at 49 psi for 3 tests. Friday I finally have the whole day in the shop and am going to be putting in my new 4.56's and probably change the fuel filter too, that sounds like another reasonable problem. Any more suggestions are more than welcome!

 

That P0140 is troublesome, even if it didn't come back. Oxygen sensor codes tend to hover for a while in the pending queue before the CEL is set.

Those danged Bosch sensors react so fast they confound our PCM's with what look like trashy waveforms. They're accurate enough, strictly speaking, but our PCM's don't have what it takes to clean up those signals and makes sense of them. It might be worth swapping that critter out just to eliminate it from consideration.

 

Yeah, I might just end up buying two new NGK's or something this Friday. Something else to do while its up on the lift haha

 

Here in omaha there isn't enough snow to enjoy the 4x4