Hi,
My car developed weird issue recently.
When car is cold, stitching lever to D drops RPM slightly, when switching to R the RPM goes soo low it nearly stall engine. Then it drives normally on reverse. When drive on cold and musking gas pedal, just to go around 20km/h the rpm goes really wonky and car makes loud bassy thuding sound repeatedly. This sound ins not constant. The sound come, to my ears, form transmisison. When driving dynamically problem does not appear. When the car heats up the problem dssapears on low speeds, but it appears on higher.
When warm (above 80°C coolant temp) and cruising (cruise on) at 50km/h; 60km/h; 80km/h the car also makes wonky rpm and also i can hear thuding sound. Again this sound is not constant is more like sine wave. Then when accelerating slightly more +2km/h the problem is gone. The problem does not appear when car goes above 90km/h. Tranny changes gears smoothly (smoother than I can shift the manual car).
This is very annoying and I'm lost. I'm out of ideas.
323CI + ZF5hp19
I did change oil + filters and the cooling lines (they were leaky) about 2y ago.