Help with Boss' F-150

[vanillagorilla]

My boss has been complaining about a shuddering/surging issue when he reaches a certain speed while going up a slight hill in his 05 F-150. It's incredibly repeatable and we were able to do it a few times today while I was logging.

However, I was unable to tell what was going on with his truck. I figured it was TCC related, so I logged when it locks up. I'm more of a Gen III GM guy, but I've never seen timing jump around like this.

Check out frames 870-896 and 1340-1375. The timing goes ape shit all while the TCC is locked. I also noticed that the TPS is going crazy here too. I confirmed with him to hold the throttle steady, and he was, but it still looks fuzzy.

No codes whatsoever. Bad TPS, coil pack, TCC solenoid or ???

[vanillagorilla]

I'm not sure if the MAF's been cleaned or not. It's a dealer maintained/ext. warranty truck. I would think if it's the MAF that it would be doing it during other conditions than only at 42-43mph when the TCC locks up. The MAF readings seem steady, but timing and TPS are jittery.

[vanillagorilla]

HA! I was just looking over the log again, and I noticed that the B2S1 O2 sensor is averaging 100-200mV the entire time! I think that's the issue that needs to be addressed first.

[Pete@SpecialistTuning]

Try logging knock retard and load to get a little better picture. There is false air getting in or something your at 10-11% add on LTFT.

[vanillagorilla]

I logged KR and didn't see any. So are you saying that because the LTFT's are at +10% its trying to add fuel? Wouldn't the STFT's be off too? That leads me to believe that the issue is only in closed loop, however we went for a ride to day and it shuddered from a dead stop.

[gman4dx266]

Sorry for bringing up a ~1 yr old thread, but iIt's worth mentioning for anyone else experiencing this, that Fords have a problem with torque converter clutch shudder. We (autoparts store) sell a product called Dr. Tranny Shudder Stop, its made specifically for Fords. It's in a red tube with white letters, usually about 5$, if i recall.