ZF 8 speed rpm goes up and down until warm?

Possible a idle air control problem. Try running a bottle of Lucas fuel system cleaner through the next full tank of gas.

airforce26yrs said:

Possible a idle air control problem.

Click to expand...

Its just weird. So until it warms up I run it in 6th or 7th so I dont have to listen to it because I have the carven exhaust. It makes my blood boil listening to it when I'm already in a bad mood lol

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.

Maybe you should check the Transmission Cooler Bypass Valve

I have a 2014 ram that does the same thing put new torque converter in change megatronic sleeve o-rings I think that's what it was. An a tune up that was the first thing I did and now it's getting so bad I can't even handle driving it the truck actually jerks on the RPM bounce and it doesn't go away no more once it warms up motor. And some days it seems like it's could be the motor but then it could be the tranny just so hard to pinpoint what one's doing it