LSX 376 B15 Misfire, does not reproduce during Crank Sensor Re-Learn

[RonVC]

At the bottom of the page beside channels is log details. Are you saying that doesn?t work without the training/test?

kewl, thanks.

No MisFire related DTC's:

Protocol Info: J1962: CAN, 500 kb/s

ECM: 7E8, CAN, ECM -EngineControl - E67, GM Gen4
VIN: 1GTH5MFP4B8123921 - 2011 GMC Canyon SLE, 5.3 L, 8 Cyl
Serial: 86AAR5K31004308B
Programmed State: Fully Programmed
OS: 12639299
Calibration IDs: 12639299, 12635735, 12635733, 12625997, 12624189, 12624207, 12624215, 12624209
Calibration VNs: 0000141F, 00004914, 0000C7C8, 00001F46, 000021D6, 0000972A, 0000CA08, 000094DE
Basic PIDs: 44
Controller Type ID By OS: 5040

None: 7EA, CAN, TCM -TransmisCtrl - T42, GM A4
Serial: BKYSLUK033450108
OS: 24252956
Calibration IDs: 24252956, 24252651, 24252643, 24252653
Calibration VNs: 00002DD0, 000032F4, 00003A0E, 000001A5
Basic PIDs: 7
Trouble Codes:
P0741 - Torque Converter Clutch Solenoid Circuit Performance/Stuck Off (Permanent)
Controller Type ID By OS: 50

None: 7EB, CAN, FPCM-FuelPumpCtrl - FSCM A, 2011-2012 CTS-V
Serial: GA1901X01022S13X
OS: 20791915
Calibration IDs: 20791915, 20815693, 20808548
Calibration VNs: 0000B0E2, 00002D2F, 00006417
Basic PIDs: 8
Controller Type ID By OS: 100

[RonVC]

Have the P0300 Re-Enabled now and will run a logfile once sun cool's off a bit, truck is outside in the heat....

[GHuggins]

You have to also put your misfire settings under the misfire tab back to stock and that's even if it'll show them.

[RonVC]

Ok, Various logs collected and MisFire counts accumulating, as noted previously, Cylinder #5 is out of bounds.

No it has spark, compression is ~145 lbs, injector is flowing good....

Few logs attached, any insights would be appreciated.

DTC's tripped:

Trouble Codes:
P0305 - Cylinder 5 Misfire Detected (Pending, Current, Permanent)
Controller Type ID By OS: 5040

[GHuggins]

You also have a pedal correlation code P0121 that you'll want to fix too, but yes cylinder 5. It was setting coil codes previously. Check voltages and everything going to the coil with it plugged up and running via back probing. Make sure the plug and wire are good (I assume replaced with the coil?) then if you can do a leak test. If you don't have the tools for a leak test then do a running compression test and compare that to a neighboring cylinder. Swap all 4 (injector, coil, plug and wire) with a neighboring cylinder and see if the problem follows. If it doesn't then yank the valve cover and see if anythings off there such as a loose rocker, broken spring or maybe a wiped cam lobe. You should technically have some sounds with everything except possibly a cracked or broken spring.

[RonVC]

....

THANKS!

Make sure the plug and wire are good (I assume replaced with the coil?)

Yep, all cylinders, all wires, plugs, coils. Couple cylinders, in fact #5 used the "Granatelli Motor Sports Malevolent Coil Packs" just in case spark was weak.

If it doesn't then yank the valve cover and see if anythings off there such as a loose rocker, broken spring or maybe a wiped cam lobe.

Have performed the crank without starting to visually verify all rockers moving, seems ok, meaning all rockers moving about same distance.
Have not actually ran engine with valve covers removed, not sure if something at operating speeds would be occurring?

Compression is ~145 on all cylinders, have as yet not performed leak-down, but do have the Harbor freight kit.

Check voltages and everything going to the coil with it plugged up and running via back probing.

Know wires are sparking and plugs do seem consistent across drivers/passenger side banks.
Not 100% sure what back probing means, assume checking voltages all the way back to the ECM?

The fact the mis-fire is not 100%, is that typical for ecm detection to not be 100%, yet the physically indication/observation is 98% mis-fire, in that the mis-fire will go away about 2% of the time?

[gtstorey]

Back probing is checking a circuit by probing from the back side of a connector, with it connected.

[edcmat-l1]

At the bottom of the page beside channels is log details. Are you saying that doesn?t work without the training/test?

He couldn't access the DTC switches without going through the "training".

[Alvin]

Interesting, if I open any log files, then DTC's are not readable?
Only after connecting to vehicle can DTC's be read and the only DTC triggered at the moment is the lingering P0741 "P0741 OBD-II Trouble Code: Torque Converter Clutch Circuit Performance or Stuck Off " issue. That another topic.

Is there a HPTuners licensing issue that limits DTC's from being read from log files?
My license is per vehicle, not the unlimted type that a professional tuner would have access to?

It's in log details. It polls for DTCs on start up. If it throws a code while running it will not show up there.

[gtstorey]

If it throws a code while running it will not show up there.

I didn't know that.

[RonVC]

Wanted to provide an update after running another compression check that showed about ~130 while running, cold and warm....

However, started looking at Plug and Wire...

DOH!, Dont ask me how, they were brand new couple months back and I am the only one who worked on the engine in that time. So, WTH!

Anyways, misfire gone after new plug and wire...

Thanks for the help and hint to enable P300 MisFire to diagnose which cylinder.... Not sure, but original tuner must have disable all the P300 MIL's....