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Rise, then fall in rpms while accelerating. 850

posted by  AlanS on  Tue Nov 2 10:02 CST 2010
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last visit: Sat Oct 4 19:59 CST 2014
[RELATED]

1995 850 NA/ 180,000 miles.
I have mentioned this before, but it is getting to be an increasingly annoying problem: As I accelerate...parkway speeds...light acceleration...the rpms rise and then drop about 200 rpms. It would be akin to the car shifting gears, when it reaches max, it shifts, thus lowering rpms...EXCEPT, there is no shift change. Light acceleration, rpms rise, then drop about 200-300 rpms... I changed the tranny fluid...this didn't do anything. I know very little about the technical end of things, but I would love to think it's a vaccuum hose of some kind rather than slipping gears. The car NEVER slips out of gear, either up or down. Shifts nicely...






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