Could my missfire code be a true miss fire? It happens around 5,500 RPM right before the truck shifts. there is no noticeable miss felt or anything else wrong.
I've do a little resaerch and have found that installing a smaller or lighter wieght torque converter mybe the cause of the missfire. I'm now wondering if it could be a true missfire and if there is something I can do with HPTuner to fix it.
The truck has TR6 plugs gaped at 35 thousands I believe.

 

Just for giggles...do a crank relearn. Just ***** and giggles and keep us updated. It doesn't make sense, but it could help. HPT scanner>tools>special>case relearn...(my misfires went away after the crank relearn...I had a few at 4900 to 5200) Just a thought, only takes a second...okay three seconds.

 

I tried the crank relearn on mine but it wouldn't get rid of the misfire codes.

You can up the time for the misfires or disable them like I did.

 

can't find the case learn in the 2.0 HPtuner, where did they hide it?
After my dyno trip, I'm not surethat the miss fir is falts, the dyno guy said he felt it missfire.

 

Are you actually throwing codes for a misfire (p0300) or no?

 

Ya throwing the p0300 code. I just don't know where to start.

 

Did the misfires start right after you put in the stall?

 

ya It did but I also install the engine the same time.

 

Well I found out there are 45 different misfire PID listed in HPTuner. I loaded them all on the table display and went for a little cruz (to work). 100% throttle, 4300 RPM, misfires showed this;
Cylinder #1 0
Cylinder #2 0
Cylinder #3 4
Cylinder #4 8
Cylinder #5 46
Cylinder #6 8
Cylinder #7 0
Cylinder #8 0

Something is up with #5. Then I remembered that #5 was the hole I cracked a piston in, the new 6.0 is using the old 5.3's fuel injectors and rails, and also coil packs. I though I'd start with the ease stuff first, so I swapped plugs #5 to #1, didn’t help, had logged 22 misfires in one run at #5 while the rest averaged out at 2 misfires.
Now I have swapped coil packs to test the pack at #5.
Has anyone had any experience with a bad pack or a misfire at #5? I know that #5 and 7 are the leaner cylinders but #7 always shows less misfires than all other cylinders.
Any Ideas?

 

Well I swap coil pack and #5 is still misfireing so now I will try swaping fuel injectors. and if this do so some changes I don't know what to do next. I guess compression test.