RandyxGM

Funny, I am chasing a TC issue and now looking for misfire (no code).

Anyone ever connect the dots between Fuel Trim at low RPM and misfire? My transmission shop is working with me on this in a very positive manner. They have already installed 2 rebuilt transmissions and we are working together in attempt to fix this issue. I have seen on these forums a Fuel Trim issue where at very low RPM (where a lot of us are seeing that shudder) the engine is not getting adequate fuel for the load. Anyone? https://www.gm-trucks.com/forums/topic/234471-shuttermisfire-under-low-rpm-and-load/

No idea other than not Jasper.

Transmission has 308 miles on it, reman off the shelf unit, already replaced first one under warranty. This one is worse.

Custom tune parameters? I just had my 2014 Silverado 6 speed replaced. Never had shudder prior which makes me think it had a PCM tune before I purchased. Shudder is really bad now as I drive the thing easy. I have a dyno tuner in my area that will tune this thing but as you say, most don't understand the shudder issue and what causes it. Even my trans shop which is reputable asked me to share with them how to fix shudder in these things. Here is what I have picked up and will be giving to my tune guy: Disable DOD Tcc apply pressure ramp Tcc desired slip set to 0 Apply and release set 317 and 319 Zero out the TCC slip, disable the torque converter for gears 1-4 and only allow it to lock in 5th and 6th. But I increase the speed at which it does lock so it doesn't do it at 30mph type of thing. I push it out to above 40mph and nearly 50mph for 6th gear. Anyone have anything to add/offer? I just spent $6K on this thing and trans has been replaced twice in last 10K miles (2nd replace under warranty). Thanks

I know this is an old subject but I just had my 2014 Silverado 6 speed replaced. Never had shudder prior which makes me think it had d tune before I purchased. Shudder is really bad as I drive the thing easy. I have a dyno tuner in my area that will tune this thing but as you say, most don't understand the shudder issue and what causes it. Even my trans shop which is reputable asked me to share with them how to fix shudder in these things. Here is what I have picked up and will be giving to my tune guy: Disable DOD Tcc apply pressure ramp Tcc desired slip set to 0 Apply and release set 317 and 319 Zero out the TCC slip, disable the torque converter for gears 1-4 and only allow it to lock in 5th and 6th. But I increase the speed at which it does lock so it doesn't do it at 30mph type of thing. I push it out to above 40mph and nearly 50mph for 6th gear. Anyone have anything else to add? Thanks in advance and I hope someone see's this.