Odd transmission problem, need help/experience/advice
I have a 2001 330i Sedan w/ 108k miles. ZF Transmission model# A5S325Z.
- For about a month, it was shifting hard and had a small jolt/jerk from 1st to 2nd gear. I then disconnected battery for 5 hours (forgot about it and just left it out there haha) and reconnected it. Drove it the next day and all shifts are smooth with 1st to 2nd hard shift gone.
- The only problem that remains is reverse. Most of the time (not always) it engages in 2-3 seconds when the car is hot (which is weird because I thought problems occur more often when cold). In the morning when the car is cold, R engages right away with no problems. Engaging Reverse when warmed up causes the RPM to go up, and then dip down under the normal idle then comes back up to normal all in 2-3 seconds. If I don't wait until the RPM return to normal position, it will still reverse but one second later, a thud and jerk will follow while reversing.
Fluid and filter changed (fluid changed 2x) about 7 months ago @ 105k miles with Redline D4 & OE BMW Transmission Filter. Fluid came out dark gray (most likely not changed before).
My problem sounds like both software and hardware issue. Any input?
Last edited by SamxK; Today at 12:30 AM.