Good evening, this is a second try, I posted this earlier but it has disappeared...
I have a '14 ram, 5.7, 8HP70 with 150k on the clock.
I have had an issue with the transmission stuttering when in traffic and lightly on and off the gas, it was more annoying than anything, I have talked to several tranny guys and all of them wanted to change the fluid and filter, also some thought it seemed like a miss so they recommended doing a tune-up. both of those have been done and the problem has been getting worse since the service.
Now it is shifting hard at low speeds, feels like you're hitting something when the 2-3/3-4 shift happens. a couple of weeks ago I was in heavy traffic and at around 25 mph i went to accelerate at ~25% throttle and the truck bogged down like it was stuck in a high gear and nearly stalled out. that hasn't happened since. Yesterday I had to drive a couple of hundred miles and I set the cruse at 78 on the turnpike and it felt like it was missing occasionally. I borrowed a friend's laptop with HPTuners and did some testing today.
I ran the truck and tested for misfires and KR, in an hour of driving I recorded 1 misfire, however the system was continually retarding between 3 and 8 degrees the timing though the sensors were generally reading less than 1V. I don't think i have an engine problem, and the truck acts the same with MDS active and not.
While hooked up I had some new issues, first I got off of the expressway and stopped for a light at the end of the ramp and the truck died with no warning, had to screw with the shift knob to get it into park and restart. later I pulled into a parking spot and put it into reverse to back up and and straighten out, it died then and once again had to work it into park, and it was slow to turn over like a dead battery (was at 13.5v). Finally a third time i was doing a three point turn in a tight area and when I put it into reverse it errored out and required me to go to park, truck didn't die this time.
There aren't a lot of parameters available to log in HPTuners, however I ws watching the solenoid currents, solenoid B seemed to hang at 360mA while the others (A-E) were generally either on or off 850mA/50mA respectively. there were no obvious jumps in the TCC solenoid or pressure solenoid. The oddest reading i noted was it randomly going into and out of limp mode, though I didn't get any trouble codes or MILs.
Does any of this sound like any known issues? are there any specific things to look at or things to troubleshoot to try and get more definitive diagnostics info?
Any help is greatly appreciated, thank you and sorry for the long post.
Bill
I have a '14 ram, 5.7, 8HP70 with 150k on the clock.
I have had an issue with the transmission stuttering when in traffic and lightly on and off the gas, it was more annoying than anything, I have talked to several tranny guys and all of them wanted to change the fluid and filter, also some thought it seemed like a miss so they recommended doing a tune-up. both of those have been done and the problem has been getting worse since the service.
Now it is shifting hard at low speeds, feels like you're hitting something when the 2-3/3-4 shift happens. a couple of weeks ago I was in heavy traffic and at around 25 mph i went to accelerate at ~25% throttle and the truck bogged down like it was stuck in a high gear and nearly stalled out. that hasn't happened since. Yesterday I had to drive a couple of hundred miles and I set the cruse at 78 on the turnpike and it felt like it was missing occasionally. I borrowed a friend's laptop with HPTuners and did some testing today.
I ran the truck and tested for misfires and KR, in an hour of driving I recorded 1 misfire, however the system was continually retarding between 3 and 8 degrees the timing though the sensors were generally reading less than 1V. I don't think i have an engine problem, and the truck acts the same with MDS active and not.
While hooked up I had some new issues, first I got off of the expressway and stopped for a light at the end of the ramp and the truck died with no warning, had to screw with the shift knob to get it into park and restart. later I pulled into a parking spot and put it into reverse to back up and and straighten out, it died then and once again had to work it into park, and it was slow to turn over like a dead battery (was at 13.5v). Finally a third time i was doing a three point turn in a tight area and when I put it into reverse it errored out and required me to go to park, truck didn't die this time.
There aren't a lot of parameters available to log in HPTuners, however I ws watching the solenoid currents, solenoid B seemed to hang at 360mA while the others (A-E) were generally either on or off 850mA/50mA respectively. there were no obvious jumps in the TCC solenoid or pressure solenoid. The oddest reading i noted was it randomly going into and out of limp mode, though I didn't get any trouble codes or MILs.
Does any of this sound like any known issues? are there any specific things to look at or things to troubleshoot to try and get more definitive diagnostics info?
Any help is greatly appreciated, thank you and sorry for the long post.
Bill
