ZF 8 speed rpm goes up and down until warm?

1184 Views 5 Replies 5 Participants Last post by  Bennyb4200
Ever since I've bought the truck over 25k miles ago, my 2014 Ram 1500 rpm varies up and down until warm while in low rpm. As soon as the trans is warm it drives normal and have no issues. Never gets any worse but some days it really pisses me off. It seems like a tuning issue. Any info? I'd pay to have it disabled. I've tried to research this issue multiple times but have never seen anybody ask the same question. Don't believe it to be the torque converter because it seems like if it were bad, it wouldn't go away when warm. 140k miles on it currently. Again, has done it since I've bought it and never got worse or better.
1 - 1 of 6 Posts
1) Check and test the coolant and level.
2) Monitor the coolant temperature from cold to hot (it will climb from ambient to operating temperature).
3) Monitor the transmission temperature, it too will climb.
4) Access any recorded faults with the entire network and post them so the readers can view them.
Idle air control is via throttle body angle (gasoline engine).
If it is a gasoline engine, the throttle body voltage and or degree of throttle angle can also be monitored.
Simple OBD II scan equipment can offer "good enough" data to monitor those values.
One last point, does that Ram have a thermostat? Has it been tuned?
If it has been tuned, revert to the original tune and test again.
1 - 1 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.