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This could be caused by a variety of things.....but, coolant temperature is a significant input to the transmission control module for the overdrive gear engagement. If the transmission ECU determines the engine is not coming up to operating temperature, it will delay the engagement of the overdrive. There is also the possibility that the throttle position sensor has an issue as well....is the check engine lamp illuminated??? A scan of the engine control module and the trans module is in order....a good tech. will be able to discover the cause very quickly!
check transmission fluid levelif you see metal shaving in oil pan time for rebuilt if you see more than a table spoon full of shavings but i would change transmission fluid and filter.if engine running higher rpm on acceleration transmission is slipping.
there is no cap, to add transmission fluid you must pour it through the dipstick pipe. Transmission fluid should not decrease in leavel unless you have a leak. I would have it checked if you are losing trans fluid!!
Transmission problems in the RX300 are common for those who never flush the transmission fluid. I would strongly urge you to quit driving your RX300 and get it to a dealership where they can flush the transmission fluid. There is no transmission fluid filter (per say) but there is a "screen" inside the transmission that needs to be flushed out (this serves as the filter). Pull out your dipstick for the transmission and smell the transmission fluid - does it smell burned? I hope not, but regardless, take it to a dealership and get the tranny flushed and see if that makes a difference. Also, continue to flush the transmission every 60,000 miles at most! Lexus says that you do not need to flush the transmission, but I think you do. I have a 2001 Lexus RX300 and I have had no problems with the tranny and I've flushed it at 60,000 miles and then again at 115,000 miles. I now have just a little over 120,000 on it. It's a good running vehicle but you need to care for it!
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