you'd think if the FPR were torn and leaking or somehow getting too much fuel, that the fuel trims would pick it up as they
Yea i had a feeling that wouldnt fix anythinf but i wanted to check it off the list, thats for sure.
Does the voltage change at all when it acts up?
According to the logs ive viewed no, but occasionally i will see the tach bouncing which seems like EMI to me, but im not sure. I went down a rabbit hole as part of my problem solving by checking the coil voltage with key on /off and in "run" and deduced my ignition switch was so sloppy, key movement would change voltage +/- 1v lol. I thought that was an issue but alas, just improved the trucks operation but didnt solve my mystery.
might also check the plugs/wires and also make sure no plug wires are touching ECM or ICM wires.
Yea ignition was one of the first things i investigated because it acted like coil fade but after replacing the coil, checking all 8 plugs, and replacing the cap/rotor, nothing changed. Never actually changed the plugs, just checked them, they didnt look fouled so i said F it. Maybe i should toss a set in for giggles.
As far as potential EMI from plug wires touching sensitive electronics, theyre near them but not on them i think.
did you ever check the fuel pressure? although the trims looked OK in the log....
incoming pressure? After filter? Yes. 60psi with the ep381 that was in there, and now 15 or whatever with the stock pump thats in there. Didnt check while driving... i cant
Return pressure? I dont have the setup to tap in and check while driving.
TBS should be very close to .5
A .65 is too high.
I think the ECM uses tps volts at start up as a baseline, and anything less than about 1.0 (maybe even higher) won't mess with the ECM. I think the benefit of being around 0.5-0.6 at idle is the tps has more of its operational range to work with.
I can loosen the screws and probably adjust the tps to read .5 at rest, maybe even less. I swear i thought it used to sit on .45 when i installed it.