Originally Posted by Ape
Edit: Subject is evidence of my exhaustion. Put truck in there somewhere
Tried to fix the subject title but I don't think i did any better than you did. It's hard.
Ford says prob bad rings but their going off the I-D-10T manuals.
I can understand arriving at that, being that no DTC's accompany the condition, although the problem completely goes away when it's warm, but did they physically verify that with a (simple fucking)
After it's warmed up, which as you know is when closed loop happens, so the PCM could be compensating for X condition, but within range so it's not posting DTC s. No pending codes either? A live data reading sure would help. I wonder if Autozone's big ass orange scanners have that capability. That way you could check stuff like ignition timing and ST/LT fuel trim and see if that stuff is approaching out of limit thresholds.
Anyway perhaps forget DTC s it might just be back to Air, Fuel and Spark with this badboy.
You don't include;
spark plugs/verify gap
plug wires/verify resistance within specification
in your list. More exhaustion?
Anyhow this all assumes it's in the engine. Let's see what others have to say.
And oh yeah What year and what engine is in your truck?