Tiptronic Troubles, ATF change

[billb123]

I am changing the ATF and filter in my '06 Cayenne S following the procedure on our host's site. It went wrong at the point where I had added 4+ quarts of new ATF and it started to overflow. At that point i started the car and after a maybe a minute put it into Reverse and Drive. Nothing happened. The wheels didn't spin. I let it warm up for 15 to 20 min at idle and the result was the same.

The problem is almost certainly something that happened during the drain/filter change/refill process. I hadn't had any problems with the transmission before. Plus, after I got the car positioned with all four wheels off and level but before starting the procedure i checked that I could start up and go into reverse and drive. Wheels turned freely.

Any ideas??

[Determined]

Interesting, I'm planning to do the same on my 06 Cayenne S in a few months because I'm at 70,000 miles now. I would suggest asking Wayne directly since he asked on this forum if we have any questions. I have prepared myself by reading the instructions and others input as well so I hope all goes well also. Good luck.

I'm doing both fuel pumps this Saturday so I'll post my results afterwards.

[billb123]

Good luck with the fuel pumps. Just had that job done by my local independent. Definitely seems like a "five wrench" difficulty rating

[mtnrat]

Did you follow the proper fill procedure?
http://www.pelicanparts.com/techarticles/Porsche_Cayenne_Tech.htm
Look under transmission for the oil change procedure.

[jhg41977]

I used the procedure that came with my kit from ecs tuning. Procedure was essentially the same as on Pelican.

Lift and level the car.

Drain fluid, remove pan and filter

Replace filter and pan

Fill through the larger opening, initial fill 4 qts +/-

Start car and engage drive, reverse, drive with a few seconds in between each. Return car to park and leave running.

Fill some more, while running.

Repeat drive, reverse drive, park each time the fluid starts pouring out.

Check trans fluid temo, dont exceed 140F (I think that was the temp) if temp is exceeded, replace fill plug and turn off car, let cool down and then start again.

Mine took around 9 qts. Hard to tell because so much spills out

[mtnrat]

The tranny temp for filling is 40 C or 104 F.

[Brainz]

From your description, it sounds like you didn't fill the trans with the engine running, which means it's likely very under filled, and explains your lack of drive in gear.

An empty pan will hold only ~4 quarts with the engine off. Then you start the car and fill with the engine running and the trans in Park. It should take another 3+ quarts before it over flows. When you think you're full, keep the engine running and shift between R and D several times. Keep the engine running but shift into P and see if it will take any more fluid. Don't turn off the engine until the fill plug is reinstalled.

If that doesn't fix it, or if it has strange shifting issues (like not engaging gear), especially after sitting for a few days, then you may have pinched or rolled the o-ring when installing the filter. If the filter is installed cock-eyed or if the o-ring is damaged, the trans will have trouble drawing enough fluid during the full process and can be easily underfilled, even following the correct procedure.

Unfortunately, you'll have to drain the fluid and pull the pan again to check/fix the filter and o-ring. Be sure to lube the o-ring with ATF and tighten the filter bolts evenly so that the filter o-ring seats perfectly squarely.

Hope that helps.

[billb123]

Thanks to everyone for the advice. I think it is the o-ring. I did attempt to fill while engine was running but it wasn't taking any more fluid, which is consistent with a damage/unseated/inoperable o-ring. Will be back at it this weekend.

[billb123]

It was the o-ring. I pulled it apart this weekend and found the o-ring pinched and bent. Put a new one in and followed the procedure and all seems well. The factory manual emphasizes a turning motion while installing the filter with the o-ring, which i was more careful about the second time. Thanks all. Cheers,

[Determined]

This is my next project, I pretty much have everything I need except the special hook (u-shape) for refilling it.

Did you use the special filling nozzle or just make your own? Or was it necessary at all?

Determined

[Brainz]

Bill, congrats on the fix!

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[Brainz]

Determined: In my opinion, you really need a pressure filler like the Motive or a modified garden sprayer. I tried using a hand pump, the type you buy at the auto parts store that threads into the bottle, and found that pumping 7+ quarts of fluid takes forever (and is both dangerous and exhausting given that you're working under a running car with hot parts close by. I gave up when the hand pump broke halfway through. For Plan B, I assembled a poor man's Motive with a garden sprayer and other parts from Home Depot. I used a quarter turn (toilet) shutoff valve and a "wand" made out of ~12" of 3/8" soft copper tubing. I crudely hammered/bent over the end to make a 90 degree tight bend at the far end of the wand. 1/2 clear tubing and some hose clamps links it all together. Works amazingly slick, and fast for filling transmissions and diffs. Bonus part is that I also use mine (after a good cleaning) as a pressure bleeder for brake jobs.

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