Converter unlocking at 80 mph

[Cool28]

Went for a nice long drive this weekend and discovered my converter unlocks alway around 76-80 mph just cruising. The lockup and release for tps is set right but it still unlocks. It will also relocks at 70 after a couple mins. Is there anything else that could be making it unlock?

[joecar]

Log the misfire count pids, and brake switch state (it's in one or more of the TSTATExx pids).

[Cool28]

Ok going to try and log it today. I know tstate12 was blinking yes/no at idle thought that was weird

[Cool28]

well ran a log its unlocking cause of misfires very strange doesnt feel at all like its misfiring.

tst.efi

Guess my next question is why is it misfiring. put brand new o2 sensors in.

[joecar]

I see the LTFT's pegging high, indicating a lean condition (over the entire log), the HO2Sx1 voltages support this;

so either a lean condition exists which causes misfires (but I see only 11 seconds worth of misfires),
or misfires occur which causes the O2's to report lean (O2's see unburnt oxygen);

Is this a newly installed stall converter...? Did anything change on the crank (e.g. converter, flexplate, pulley)...? If so, did you do a CASE relearn...?

If this started happening without any parts/tuning mods, then check for:
- airleaks (MAF, intake, injectors, exhaust, O2's, cats, PCV, AIR, EGR),
- check ignition components,
- internal coolant leaks;

If this started happening after tuning changes, then check that the VE and MAF are not under-reporting air.

Only 11 seconds of misfire occurs (what triggered it...?), but LTFT's are pegged positive for the whole log (why...?).



BTW:
your log shows 31 pid channels (shown at bottom of PIDs tab)...
if you can reduce the pid channel count to no more than 24,
then the sample rate will be highest (10 Samples/second vs 5 S/s)...
for future misfire logging, you can remove these pids:
- TRQENG (2 channels),
- EST_BASE_DMA (2 channels),
- STFT1/2 (together 2 channels),
- TFT (1 channel);
[ you now have 24 pid channels ]

[Cool28]

Well I've noticed misfires since I change the PCM. Ever since then when I load a program it always wants to add fuel. then it evens out and is fine. I'm been also getting heat performance on bank 2 sensor 2.

With the new PCM and when I put in the new converter I did a case relearn.

Don't know if this would do it or not but when I installed the PCM I had a couple evap codes that I ended up setting to not report. It could be that I don't have it plugged in. Would that have anything to do with this?

[Cool28]

I had 4 extra wires leftover from the repin

[joecar]

If you have EVAP, AIR, EGR emissions systems, check that each one is not leaking...

The EVAP system might be allowing an airleak, I would have to read the description of it again.

[Cool28]

If it help I believe it was setting p0443 dtc before I turned it off

[Cool28]

Hmm now checking my repin those are the first 2 pins to change so I must have another issue going on for evap.