Jerking auto transmission
Just when i thought I'd get a few weeks pleasurable driving, having fixed the latest gremlin, I start to get a sort of jerking that seems to originate in the trans. That is, it's not a misfire, it's like someone slammed the brakes on momentarily bam-bam-bambam. Occasionally happens on high speed coast (ie. going downhill on a trailing throttle) and sometimes on a cruising throttle. Take-off seems to be a little jerky and hesitant too like it's trying to shift up too soon then drops back into the lower gear. I tried flicking into neutral and coasting to see if the problem recurred under no load, and noticed a bit of a thump as it went into neutral, but going back into drive no noise and trans seemed to pick up smoothly. Trans fluid level is OK but I have no idea when it was last serviced. Anybody have a test regime that I could employ to pinpoint the problem?
June 88 535iA, 173,000 km; Sep 00 735i 170,000 km