HELP 986 tiptronic jerky shifting

rdb525i · 01-10-2013, 07:45 AM

986 tiptronic with 47k on the clock. It suffers from jerky shifting from 2nd to 3rd and only on low speeds ( never on hard acceleration or down shift). It seems to lunge forward on upshift to 3rd gear. All other gears are ok. Basically behaves the same if i shift in manual mode. Thought I just needed a fluid and filter change so I did that. Fluid was old as expected but nothing too bad. It didn't smell burnt either. Doing this didn't cure the problem. Thinking it might be the valve body ? Any help is most welcome Thanks in advance

jwgn777 · jwgn777's Garage

Hello have you disconnected the battery recently? Try driving the vehicle with different degrees of load situations in both manual an automatic modes for a while if you recently lost power to the tiptronic module such as a battery disconnect. JW

jwgn777 · jwgn777's Garage

By the way how did you or your service tech go about checking you fluid level after you changed you filter? JW

Nostril Cheese · 01-13-2013, 02:52 AM

How exactly was the fluid changed?

rdb525i · 01-13-2013, 03:26 AM

Thank you for the replies. I'm afraid I can't tell you for sure what procedure they followed to drain and refill the system as I just dropped the car off the indy shop I normally go to for my cars. I'll go and check with them since you got me thinking.

I'm afraid the battery hasn't been disconnected at all prior or after the fluid service. There's another boxster in the same shop with the tranny out (22,000 KM only) -owned by a friend and willing to lend me the valve body while he waits for parts from the states just to see if it will cure my problem. Thinking its a slow solenoid or faulty seal so it cant generate the necessary pressure needed to upshift. Scanned it with a durametric and tiptronic showed no faults. I will post how I get on.

Thanks again, appreciate all the input.

jwgn777 · jwgn777's Garage

Just to let you know the correct way to check you trans fluid is to warm the engine between 30 -40 degrees Celsius. I would use my KTS Porsche tester to check the temperature for this. And when the vehicle is raised evenly level you would remove the fluid check plug and a very small amount should dribble out. If no fluid comes out you would have to refill through that plug. JW