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Join Date: Dec 2010
Posts: 190
Intermittent revs at cruising

Well I'm back after three years! I'm on to my 4th Boxster. This time it is a 2005 'S' Tiptronic with 100k miles.

When cruising at low speeds say 35 to 50 mph the revs go up and down slightly without any gear shift taking place. It happens every few seconds. I didn't think much of it at since it is my first Tiptronic.

I was surfing another less known porsche boxster forum when I saw someone else ask about the exact same question/problem. The posting was very old. He was advised to get the codes but never did tell folks what the problem was in the end.

Has anyone else had this problem and solved it. I can't imagine it is caused by too many different issues. If I have to buy a Durametric or bring it to the Indy I will. But I really enjoy fixing things on the car. I'm guessing it is some type of vacuum issue?

Thank you!
Old 11-10-2016, 05:04 PM
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I've ordered a Durametric. I promise to provide details of what it took to fix this . I'm guessing there aren't many Tiptronics and even fewer have this issue. I need to check the 911 forums, I think there were a bunch of Tiptronics sold there.
Old 11-14-2016, 04:19 PM
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Not typical of a TIP car. I had two.
Old 11-15-2016, 04:07 PM
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Update - Cleaned MAF and did not make any difference. While I was doing that I notice two of the web of tiny vacuum lines are loose. I'll have to figure out where they connect. It might be the problem.

Durametric showed no codes. In fact the car is in great shape.

I'm going to change the gas filter. Since the problem only occurs at around a steady cruising of 2k rpm it is work a try.

Will update later.
Old 11-25-2016, 06:22 PM
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Re: Will update later. ??
Old 01-02-2018, 12:11 PM
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Torque converter clutch lock-up slipping??

If so it will leave fine powdery metal in oil pan. Magnets in the oil pan will look "harry" from all the fine metal attracted to them. All to common problem. If caught early enough you might get away with and new/re-manufactured Torque converter AND a good flushing of trans fluid. Flushing completely two or three times and cleaning pan/magnets each time. Best to rebuild trans also. If replacing w/good [check the oil pan for fine metal/harry magnets] used transmission I still recommend a rebuilt Torque converter.
I recommend changing Tiptronic trans fluid at least every 25k miles. Adding an extra ground wire I here from the experts is a good idea. A good working trans cooling system very important as we
Old 01-12-2018, 10:13 AM
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