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Having Automatic/Tiptronic Gearbox issues?


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Hey guys just thought i try start a wee thread here hopefully to help out some people but also get some feedback if others have had the same success as i have?

Anyways it started when i brought my 03' BP shaped legacy (Tiptronic) car drove sweet but the gear shifts were just a wee bit to jerky/Rough for my liking. initially after researching a bit i tried getting the Trans serviced and fluid and filter replaced, which helped a tiny bit but I'm quite fussy with cars (have had this confirmed by the mechanic too) and getting them running how they should and knew there was room for it to be improved even more so. I dug a little deeper through forums and found out how sensor reliant cars are becoming the newer they are, and also how a trans issue can sometimes, not always be traced back to a sensor or engine, i wouldn't say fault but a part not performing at its best. After a bit of self diagnostics online i then went on to replace the spark plugs, flush the fuel system (injector cleaner) and ran some upper engine cleaner through the car which has in all honestly made the biggest change. Not only is the accelerating and over all responsive-ness of the car much better but the gear shifts are as smooth as ever! especially for and 03 Legacy with 159XXX kms on it

And more Recently .. I have brought myself an 07 B-Spec legacy (Tiptronic also) recent cam belt change, and everything worked as it should except the gear shift between 2nd and 3rd?? not the other way around or any other change just that particular shift and was super rough sometimes jerking the whole car. i like to think i know a wee bit about Subarus as Ive owned 11 of them now but am certainly no expert nor a qualified mechanic but my first though was its obviously a trans issue. I only just got my car back from the mechanics this afternoon FIXED! - K G Mcloeds in Dunedin, couldn't recommend them and higher to anyone in the area. he'd encountered this problem before being either one or a combination of Dirty AFM, Dirty or faulty throttle position sensor and/or throttle housing. The car is that reliant on these sensors that if something goes wrong for whatever the reason like with my car and the car basically re-learnt how to not change between 2nd and 3rd properly. and sometimes even if the issue is fixed the car will carry on performing that way unless told otherwise, Admittedly he did do whats called a re-learn procedure with the car but some things the car would gradually relearn for itself or potentially something like an ECU reset may help

Basically just would like to put out there that if you are having issues like rough changes between gears, rough idling or anything like that consider things that are just standard maintenance which may need replaced or cleaned that could effect acceleration or basic engine function as the ECU and TCU all work as one. Not saying everyone will be so lucky like me, it may turn out to be an actual trans problem but in the case of my 07 legacy I'm over the moon i only had to pay the mechanic $200 or so to scan the car, take apart and clean my intake and re-teach my trans instead of having to fork out $1500 and upwards for a new trans or major repairs which I'm sure some mechanics would jump to recommend without actually knowing just more concerned about what their back pockets will look like afterwards not your car.

on a side note i hope this helps some people as i didn't come across an article myself where someone posted their results with this sort of issue or a similar problem

annnnd another note my beautiful looking, and outstanding performing 03 Black GT-B Wagon is reluctently for sale as i have no need for 2 legacy Wagons ha, price is set a bit high as i don't wanna sell it to any old muppet on trademe who will just ruin it. If anyone is interested feel free to make on offer the wheels, tyres and springs are worth about $3000 alone

http://www.trademe.co.nz/Browse/Listing.aspx?id=883800739

Thanks Guys! :D

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I had similar problems with one of my old legacies. Tried all sorts to sort it. Ended up diagnosing a faulty wheel speed sensor. Broke up with the mrs before I could replace it (she kept car)

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Any ideas on the best way to clean the throttle position sensor (if you can)? I have done all the other things AFM/filter/plugs/upper engine cleaner and wouldn't mind cleaning the TPS if possible. also interested in resetting the TCU

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My understanding was (from how he explained it initially) was he removed the intercooler etc and took it all apart and visually inspected everything and then cleaned and sprayed it with AFM cleaner type spray that is not so harsh on sensitive things like electrics and sensors. Will try get in touch with him on Monday to confirm and how he reset/re-learnt the TCU

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This worked for me a year ago when i bought my wagon.

Used redline fuel system cleaner, subaru UEC, crc maf sensor cleaner, service engine, atf, front and rear diff oils then reset tcu.

Car was way more responsive, idle was way better, tranny wasn't so sluggish anymore. Working like a dream.

I have reset the TCU through free ssm.

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