My transmission is revving high before changing gears, specifically going from 2nd gear to 3rd gear. There are no dashboard warning lights or any OBD2 codes. It has always been well maintained per the recommended maintenance schedule. Per the Acura Dealership after performing two transmission flushes and updating the TCM the transmission is okay and not the issue but the high revving before changing gears continues. What has been recommended is a new ECU unit to fix the issue. Everything else work fine and no issues such as getting out of park or using reverse or any of the other gear changes. Please help. Thank you.
Well, … shirt happens when you flush! You see, they use a machine. Machine that, just perhaps, was contaminated with fluid from a previous job? Or worse, they just connected it to your car with fluid from the previous still in it. You will never know, …
Anyway, … flushing machines circulates ATF to clean up a gunk, … and gunk, more often than not, is force fed into some tinny orifice that regulates a flow to a certain shuttle valve that switches ATF flow to activate a certain part, … as it is being flushed out!
You partially clog that tiny orifice, … and guess what? Shuttle valve shuttles slower, … or does not shuttle at all! And that is, … just perhaps the reason “high revving before changing gears" - delayed actuation of the slave that controls shifting process from 2nd to 3rd.
Anyway, a midrange scan tool with automatic transmission diagnostic feature should be able to check for this. A good one will display pinion gears speeds, as well when the switch is flipping. If one monitors those speeds, and timing it takes to switch from gear to gear, …a leisurely switch will pinpoint the problem. … and now a blame game! …fwiw.
F.S.
You really did not want to flush it as transmission flushes can create all kinds of issues.
At this point I would say do what they recommend as they have tested the car first hand.
The flush was recommended to get any potential gunk out of the torque converter in case that was the issue but based on their assessment that is okay and not the issue. I was just wanting to know if anyone else had experienced a similar issue with an Acura and if the ECU replacement solved the issued before proceeding or any other potential feedback on potential fixes.
I hear an "Aw Crap" coming on!
