Join Date: Jun 2016
Location: Living on the east coast, Cape Breton as you may have guessed.
You bring new information to light, and I do appreciate your time. When I had the tranny shop test scan the issue, I drove so I could duplicate this bouncing tach. The tech who did the actual scan after feeling this RPM surging, did a transmission fluid and filter change, a knew air filter, checked the MAF sensor, and test scanned the car while in the garage beforehand which yielded no codes. The problem in my particular is the TC locks and unlocks. I do have access to an update that may, or may not resolve the issue. The stumbling block for me is whether anyone here on the site knows anymore about it than I am aware of. Possible side effects of updates going wrong (doing more harm than good).